Nanocoating GDZ is compared with Conventional YSZ coating for Hot Corrosion Resistance in presence of V2O5 and Na2SO4 salt which are formed at high temp in gas turbines.
The desired to reach higher efficiencies, lower specific fuel consumption and reduced emission in modern engines has becomes the primary focus of engine researches and manufactures over the past three decades. Ceramic coating is a solution to such problem as they provide good thermal barrier properties for designers. In the design of adiabatic engines, reducing in cylinder heat rejection requires very special thermal barrier coatings on the engine combustion chamber. Partial Thermal barrier coatings (TBC) on the top surface of the piston is considered as a solution for reduction of unburned Hydrocarbon (HC) emission produce by incomplete combustion with respect to crevice volume when engines start. The TBC on the top piston surface decreases the thermal conductivity and increases the unburned charged oxidation, so that the metallic substrates will be exposed to lower peak temperature thereby reducing the thermal stress in engines components. Also thermal barrier coatings on other elements of combustion chamber of internal combustion engine offer advantages including fuel efficiency, multi fuel capacity and high power density. Therefore, thermal barrier coating (TBC) technology is successfully applied to the internal combustion engines, in particular to the combustion chamber.
This seminar presentation discusses thermal barrier coatings (TBCs). TBCs are ceramic oxide coatings applied to metallic parts to insulate them and allow operation at higher temperatures. A TBC system consists of a top ceramic coating, thermally grown oxide layer, bond coat, and superalloy substrate. Common TBC materials use yttria-stabilized zirconia due to its low thermal conductivity. Two deposition methods discussed are electron beam physical vapor deposition and air plasma spray. TBCs can increase efficiency in gas turbine engines and diesel engines by allowing higher operating temperatures. However, thermal cycling can cause TBCs to fail through spalling of the top coating.
Thermal barrier coatings (TBCs) were first applied to gas turbine engine blades in the late 1980s to increase engine efficiency and temperatures. TBCs lower the metal surface temperature of superalloy components, protecting them from oxidation and corrosion allowing for higher operating temperatures. A typical TBC system uses a bond coat that forms a protective thermally grown oxide layer and a ceramic top coat with low thermal conductivity to further insulate the metal underneath. New fabrication methods for thicker, more uniformly porous top coats and diffusion strengthened bond coats have improved TBC performance and efficiency.
This document discusses thermal barrier coatings (TBCs) used to protect metallic parts from high temperatures. It provides information on the structure and processing of TBCs as well as their failure mechanisms. TBCs have a multi-layer structure consisting of a metallic bond coat and ceramic top coat to provide thermal insulation. Failure typically occurs through spallation of the top coat due to stresses from the growth of an oxide layer at the interface. The document reviews approaches to improve TBC performance and durability through heat treatments of the bond coat and developing gradient coatings.
Thermal Barrier Coating For Gas Turbine EnginesNelsonkandulna
This presentation describes the thermal barrier coating process, its anatomy, types, material selection, failure, and characterization. Thermal barrier coatings (TBCs) were introduced to protect the external surface of gas turbine engine components from thermal resistance and thereby decrease the temperature of the metal surfaces. Yttria stabilized zirconia (YSZ) is one of the most popular and widely used TBC materials as it provides the best performance in high-temperature zones such as diesel engines and gas turbines. The columnar microstructure of YSZ coating provides excellent strain tolerance and adhesion to the coating. Gas turbines are used to power aircraft, trains, ships, electrical generators, pumps, gas compressors, and tanks.
This document summarizes a seminar report on thermal barrier coatings. It discusses that thermal barrier coatings consist of a metallic bond coat, thermally grown oxide layer, and ceramic top coat, most commonly yttria-stabilized zirconia. It reviews common deposition methods for thermal barrier coatings like air plasma spray, electron beam physical vapor deposition, and electrostatic spray assisted vapor deposition. The document concludes that thermal barrier coatings improve engine performance by allowing higher operating temperatures and reduce maintenance costs, making them an important technology with applications in industries like aerospace and automotive.
The document presents a seminar on thermal barrier coatings (TBC). TBCs provide thermal insulation on metallic parts through a multi-layer structure, allowing parts to operate at higher temperatures. The structure includes a ceramic top coat for insulation over a bond coat that prevents oxidation, on a superalloy substrate. Common deposition methods are electron beam physical vapor deposition and air plasma spray. TBCs allow gas turbine blades and engines to run at higher temperatures, increasing efficiency while protecting the substrate from failure modes like thermal fatigue. However, thermal cycling can still cause TBCs to spall off over time due to thermal mismatch.
This document summarizes super alloys, including their properties, applications, classifications, microstructure, and heat treatment. Super alloys exhibit high strength and corrosion/oxidation resistance at high temperatures due to strengthening from solid solution strengthening and precipitation hardening. They are classified based on their primary metal (nickel, iron, cobalt) and are used in applications such as jet engines and gas turbines due to their high temperature capabilities. Their microstructure includes a gamma matrix and gamma prime precipitates that increase strength. Heat treatments are used to control the precipitates and carbides for optimal properties.
The desired to reach higher efficiencies, lower specific fuel consumption and reduced emission in modern engines has becomes the primary focus of engine researches and manufactures over the past three decades. Ceramic coating is a solution to such problem as they provide good thermal barrier properties for designers. In the design of adiabatic engines, reducing in cylinder heat rejection requires very special thermal barrier coatings on the engine combustion chamber. Partial Thermal barrier coatings (TBC) on the top surface of the piston is considered as a solution for reduction of unburned Hydrocarbon (HC) emission produce by incomplete combustion with respect to crevice volume when engines start. The TBC on the top piston surface decreases the thermal conductivity and increases the unburned charged oxidation, so that the metallic substrates will be exposed to lower peak temperature thereby reducing the thermal stress in engines components. Also thermal barrier coatings on other elements of combustion chamber of internal combustion engine offer advantages including fuel efficiency, multi fuel capacity and high power density. Therefore, thermal barrier coating (TBC) technology is successfully applied to the internal combustion engines, in particular to the combustion chamber.
This seminar presentation discusses thermal barrier coatings (TBCs). TBCs are ceramic oxide coatings applied to metallic parts to insulate them and allow operation at higher temperatures. A TBC system consists of a top ceramic coating, thermally grown oxide layer, bond coat, and superalloy substrate. Common TBC materials use yttria-stabilized zirconia due to its low thermal conductivity. Two deposition methods discussed are electron beam physical vapor deposition and air plasma spray. TBCs can increase efficiency in gas turbine engines and diesel engines by allowing higher operating temperatures. However, thermal cycling can cause TBCs to fail through spalling of the top coating.
Thermal barrier coatings (TBCs) were first applied to gas turbine engine blades in the late 1980s to increase engine efficiency and temperatures. TBCs lower the metal surface temperature of superalloy components, protecting them from oxidation and corrosion allowing for higher operating temperatures. A typical TBC system uses a bond coat that forms a protective thermally grown oxide layer and a ceramic top coat with low thermal conductivity to further insulate the metal underneath. New fabrication methods for thicker, more uniformly porous top coats and diffusion strengthened bond coats have improved TBC performance and efficiency.
This document discusses thermal barrier coatings (TBCs) used to protect metallic parts from high temperatures. It provides information on the structure and processing of TBCs as well as their failure mechanisms. TBCs have a multi-layer structure consisting of a metallic bond coat and ceramic top coat to provide thermal insulation. Failure typically occurs through spallation of the top coat due to stresses from the growth of an oxide layer at the interface. The document reviews approaches to improve TBC performance and durability through heat treatments of the bond coat and developing gradient coatings.
Thermal Barrier Coating For Gas Turbine EnginesNelsonkandulna
This presentation describes the thermal barrier coating process, its anatomy, types, material selection, failure, and characterization. Thermal barrier coatings (TBCs) were introduced to protect the external surface of gas turbine engine components from thermal resistance and thereby decrease the temperature of the metal surfaces. Yttria stabilized zirconia (YSZ) is one of the most popular and widely used TBC materials as it provides the best performance in high-temperature zones such as diesel engines and gas turbines. The columnar microstructure of YSZ coating provides excellent strain tolerance and adhesion to the coating. Gas turbines are used to power aircraft, trains, ships, electrical generators, pumps, gas compressors, and tanks.
This document summarizes a seminar report on thermal barrier coatings. It discusses that thermal barrier coatings consist of a metallic bond coat, thermally grown oxide layer, and ceramic top coat, most commonly yttria-stabilized zirconia. It reviews common deposition methods for thermal barrier coatings like air plasma spray, electron beam physical vapor deposition, and electrostatic spray assisted vapor deposition. The document concludes that thermal barrier coatings improve engine performance by allowing higher operating temperatures and reduce maintenance costs, making them an important technology with applications in industries like aerospace and automotive.
The document presents a seminar on thermal barrier coatings (TBC). TBCs provide thermal insulation on metallic parts through a multi-layer structure, allowing parts to operate at higher temperatures. The structure includes a ceramic top coat for insulation over a bond coat that prevents oxidation, on a superalloy substrate. Common deposition methods are electron beam physical vapor deposition and air plasma spray. TBCs allow gas turbine blades and engines to run at higher temperatures, increasing efficiency while protecting the substrate from failure modes like thermal fatigue. However, thermal cycling can still cause TBCs to spall off over time due to thermal mismatch.
This document summarizes super alloys, including their properties, applications, classifications, microstructure, and heat treatment. Super alloys exhibit high strength and corrosion/oxidation resistance at high temperatures due to strengthening from solid solution strengthening and precipitation hardening. They are classified based on their primary metal (nickel, iron, cobalt) and are used in applications such as jet engines and gas turbines due to their high temperature capabilities. Their microstructure includes a gamma matrix and gamma prime precipitates that increase strength. Heat treatments are used to control the precipitates and carbides for optimal properties.
The document is a presentation on surface engineering that discusses:
- The introduction and history of surface engineering, which involves altering surface properties of materials to reduce degradation from the environment.
- Various surface coating techniques to improve properties like corrosion and wear resistance, including traditional methods like painting, electroplating, and plasma spraying as well as advanced techniques like PVD, CVD, and laser treatment.
- Applications of surface engineering in industries like automotive and aerospace to enhance performance and reduce costs by extending component lifetimes.
The presentation provides an overview of surface engineering, coating processes, applications, and advantages in improving material surfaces.
The document summarizes principles of vacuum arc deposition (VAD), a PVD process where a plasma produced from a high current discharge in vacuum is used to deposit coatings. Key aspects discussed include cathode spots that erode cathode material to produce a highly ionized metal plasma jet, and the characteristics of vacuum arc plasma such as high ionization, energy and density compared to sputtering plasmas. Vacuum arc deposition has been widely used since the 1970s to produce hard coatings.
The presentation is related to the plasma spraying that covers the principle of working, setup, advantages - Limitations along with the factors affecting the overall process.
Plasma spraying (type of thernal spraying)ROLWYN CARDOZA
The document discusses plasma spraying, which involves injecting powder particles into a plasma jet created by heating an inert gas. The particles are accelerated, heated, and impact the substrate, forming a coating. Key factors that affect the plasma spraying process include substrate roughness, gas pressure, particle size, arc power, plasma gas flow rate, and torch-to-base distance. The document provides examples of plasma sprayed coatings for applications such as wear resistance and thermal barrier coatings. It also describes two case studies on plasma sprayed titanium-graphite and diamond-reinforced molybdenum coatings.
The document is a thesis submitted by Shekh Shahjada for the degree of Master of Technology in Mechanical Engineering at Surya School of Engineering & Technology in Punjab, India. It discusses surface engineering and coating processes under the guidance of Professor Pankaj Chhabra. The thesis includes chapters on types of surface engineering processes, applications of surface engineering, methods of testing surface engineering, and conclusions.
PPT Includes physical Metallurgy for Titanium and its alloys, Weld ability of them and two welding processes : GTAW and EBW. PPT also describes the Problems with the Welding of Titanium and alloys.
This document provides an overview of thin film deposition methods and thin film characterization techniques. It discusses the objectives of the course, which are to provide an understanding of thin film deposition methods, their capabilities and limitations. Hands-on demonstrations and experiments will help participants understand each deposition method and stimulate discussion. The document then summarizes various thin film deposition techniques like evaporation, sputtering, chemical vapor deposition, their principles and examples of applications. It also summarizes various characterization techniques used to analyze thin films and determine properties like composition, structure, thickness and defects.
High temperature materials & super alloys pptSREE KRISHNA
This document discusses superalloys, which are metallic alloys that exhibit excellent strength and creep resistance at high temperatures. It describes how superalloys develop strength through solid solution strengthening and alloying techniques. The document also classifies superalloys into generations based on their composition, and lists some of their key properties and applications in gas turbines, jet engines, steam turbines, and other high-temperature industrial systems.
Chemical Vapour Deposition is a Chemical Synthesis route of Nanomaterials. Specially thin films like Graphene and Carbon NanoTubes are grown by this method.
Oil and gas hardfacing and cargbide coating pptspraymet
- Spraymet Surface Technologies provides thermal spray coatings and cladding services using techniques like HVOF and plasma spraying.
- They have facilities in Bangalore and Pune equipped with robotic sprayers, grinding, blasting and other processing equipment.
- Thermal spray coatings offer benefits over hard chrome plating like lower capital costs, selective application, and no hazardous waste generation. HVOF spraying in particular produces very dense coatings with high bond strength.
- Spraymet evaluates coatings for properties like hardness, porosity, bond strength and corrosion resistance to validate coating performance for applications in industries like automotive, steel, pumps, and oil & gas.
This document discusses various surface treatment and coating techniques, including conversion coatings like oxidation and anodizing, thermal coatings like carburizing and nitriding, metal coatings using electroplating and electroless deposition, vapor deposition methods like PVD and CVD, and organic coatings like paint and powder coating. It provides details on common processes, their applications and benefits, comparing techniques like electroless nickel plating versus hard chrome plating. The document emphasizes the importance of coatings for improving properties like corrosion and wear resistance.
This presentation discusses laser beam welding (LBW), including what a laser beam is, its properties, types of lasers, the LBW process, principles of operation, mechanics, parameters, advantages, and limitations. A laser beam is a powerful, narrow, monochromatic beam created when atoms in a lasing medium are excited by a flash tube, emitting photons. LBW uses the concentrated heat from a laser beam to fuse metals together without filler material. It offers advantages like narrow welds, low distortion, and the ability to weld dissimilar and high-alloy metals. However, it also has high costs and limitations such as difficulty welding thick joints.
This document discusses various surface coating methods used to improve wear and corrosion resistance of materials. It provides details on several coating techniques including thermal spraying methods like flame spraying, plasma spraying and HVOF. The key points are:
1) Different coating methods like thermal spraying, vapor deposition, mechanical cladding are used to improve surface properties.
2) Thermal spraying techniques like flame spraying, plasma spraying and HVOF are described in detail along with the coating materials, temperatures involved and applications.
3) Characteristics of different coatings like hardness, porosity and adhesion strength obtained from various spraying methods are summarized in tables for comparison.
Nickel-based superalloys have good strength and oxidation resistance at high temperatures up to 550°C. They are heat resistant, strong, and corrosion and oxidation resistant at temperatures from 760-980°C. There are three types: nickel base, nickel-iron base, and cobalt base. The microstructure contains a γ (gamma) phase matrix and γ' (gamma prime) precipitate phase which are face centered cubic. Various carbide phases form on grain boundaries. Alloying elements like chromium, aluminum, and titanium provide solid solution strengthening and precipitation strengthening through the γ' phase. Superalloys are used in gas turbine engines, rockets, nuclear reactors, and other high-temperature applications.
This document summarizes various surface treatment techniques including mechanical processes like shot peening and deep rolling that modify the surface without changing chemistry, thermal processes like electron beam treatment and laser treatment, and thermo-chemical processes like carburizing, nitriding, and carbonitriding that diffuse elements like carbon or nitrogen into the surface. It provides details on the mechanisms, advantages, and applications of these different surface modification methods.
The document discusses the process of sintering, which involves heating powdered materials below their melting point to bond particles together through atomic diffusion. Sintering reduces porosity and improves material properties. It explains the stages of sintering - initial neck growth, intermediate pore channel closure, and final pore shrinkage. Different sintering mechanisms are described, including surface, grain boundary, and lattice diffusion. Solid-state, liquid-phase, and reactive sintering types are also summarized. Key sintering parameters and the advantages and disadvantages of the process are presented.
This document discusses thermal spray coating processes. It describes various thermal spray methods like flame spraying, arc spraying, plasma spraying, and cold spraying. These methods create coatings through different combinations of melted or partially melted spray materials applied at high velocities. The document compares coating properties like hardness, porosity, and adhesion achieved through different spray methods. It outlines applications of thermal spray coatings for wear resistance, corrosion protection, and high temperature applications in industries like oil and gas, aerospace, and automotive.
Selective leaching, also called de-alloying or de-metalification, refers to the selective removal of one element from an alloy by corrosion processes. A common example is the dezincification of brass, where zinc is selectively removed leaving a porous copper structure. There are three steps in the mechanism of dezincification: (1) dissolution of the entire alloy, (2) replating of the more noble metal (copper), and (3) leaching away of the active metal (zinc). Dezincification can occur uniformly or in localized plugs and is caused by water containing sulfur, carbon dioxide, and oxygen. Prevention methods include using less susceptible alloys, adding inhibitors like tin
Erosion wear behaviour of plasma sprayed ni crsibEbe Nezer G
The document discusses several studies on erosion wear behavior and coatings:
1) One study examines the erosion wear behavior of a plasma sprayed NiCrSiB/Al2O3 composite coating on AISI 304 steel. Testing found the coating protects the substrate at 30° and 90° impact angles.
2) Another study evaluates the cavitation erosion and corrosion resistance of WC-CoCr and FeCrSiBMn coatings deposited by HVOF spraying. The WC-CoCr coating showed better resistance in NaCl solution.
3) A third study optimizes NiCrSiB/WC-Co coatings deposited by HVOF using Taguchi methods. Testing identified standoff distance and powder
The document is a presentation on surface engineering that discusses:
- The introduction and history of surface engineering, which involves altering surface properties of materials to reduce degradation from the environment.
- Various surface coating techniques to improve properties like corrosion and wear resistance, including traditional methods like painting, electroplating, and plasma spraying as well as advanced techniques like PVD, CVD, and laser treatment.
- Applications of surface engineering in industries like automotive and aerospace to enhance performance and reduce costs by extending component lifetimes.
The presentation provides an overview of surface engineering, coating processes, applications, and advantages in improving material surfaces.
The document summarizes principles of vacuum arc deposition (VAD), a PVD process where a plasma produced from a high current discharge in vacuum is used to deposit coatings. Key aspects discussed include cathode spots that erode cathode material to produce a highly ionized metal plasma jet, and the characteristics of vacuum arc plasma such as high ionization, energy and density compared to sputtering plasmas. Vacuum arc deposition has been widely used since the 1970s to produce hard coatings.
The presentation is related to the plasma spraying that covers the principle of working, setup, advantages - Limitations along with the factors affecting the overall process.
Plasma spraying (type of thernal spraying)ROLWYN CARDOZA
The document discusses plasma spraying, which involves injecting powder particles into a plasma jet created by heating an inert gas. The particles are accelerated, heated, and impact the substrate, forming a coating. Key factors that affect the plasma spraying process include substrate roughness, gas pressure, particle size, arc power, plasma gas flow rate, and torch-to-base distance. The document provides examples of plasma sprayed coatings for applications such as wear resistance and thermal barrier coatings. It also describes two case studies on plasma sprayed titanium-graphite and diamond-reinforced molybdenum coatings.
The document is a thesis submitted by Shekh Shahjada for the degree of Master of Technology in Mechanical Engineering at Surya School of Engineering & Technology in Punjab, India. It discusses surface engineering and coating processes under the guidance of Professor Pankaj Chhabra. The thesis includes chapters on types of surface engineering processes, applications of surface engineering, methods of testing surface engineering, and conclusions.
PPT Includes physical Metallurgy for Titanium and its alloys, Weld ability of them and two welding processes : GTAW and EBW. PPT also describes the Problems with the Welding of Titanium and alloys.
This document provides an overview of thin film deposition methods and thin film characterization techniques. It discusses the objectives of the course, which are to provide an understanding of thin film deposition methods, their capabilities and limitations. Hands-on demonstrations and experiments will help participants understand each deposition method and stimulate discussion. The document then summarizes various thin film deposition techniques like evaporation, sputtering, chemical vapor deposition, their principles and examples of applications. It also summarizes various characterization techniques used to analyze thin films and determine properties like composition, structure, thickness and defects.
High temperature materials & super alloys pptSREE KRISHNA
This document discusses superalloys, which are metallic alloys that exhibit excellent strength and creep resistance at high temperatures. It describes how superalloys develop strength through solid solution strengthening and alloying techniques. The document also classifies superalloys into generations based on their composition, and lists some of their key properties and applications in gas turbines, jet engines, steam turbines, and other high-temperature industrial systems.
Chemical Vapour Deposition is a Chemical Synthesis route of Nanomaterials. Specially thin films like Graphene and Carbon NanoTubes are grown by this method.
Oil and gas hardfacing and cargbide coating pptspraymet
- Spraymet Surface Technologies provides thermal spray coatings and cladding services using techniques like HVOF and plasma spraying.
- They have facilities in Bangalore and Pune equipped with robotic sprayers, grinding, blasting and other processing equipment.
- Thermal spray coatings offer benefits over hard chrome plating like lower capital costs, selective application, and no hazardous waste generation. HVOF spraying in particular produces very dense coatings with high bond strength.
- Spraymet evaluates coatings for properties like hardness, porosity, bond strength and corrosion resistance to validate coating performance for applications in industries like automotive, steel, pumps, and oil & gas.
This document discusses various surface treatment and coating techniques, including conversion coatings like oxidation and anodizing, thermal coatings like carburizing and nitriding, metal coatings using electroplating and electroless deposition, vapor deposition methods like PVD and CVD, and organic coatings like paint and powder coating. It provides details on common processes, their applications and benefits, comparing techniques like electroless nickel plating versus hard chrome plating. The document emphasizes the importance of coatings for improving properties like corrosion and wear resistance.
This presentation discusses laser beam welding (LBW), including what a laser beam is, its properties, types of lasers, the LBW process, principles of operation, mechanics, parameters, advantages, and limitations. A laser beam is a powerful, narrow, monochromatic beam created when atoms in a lasing medium are excited by a flash tube, emitting photons. LBW uses the concentrated heat from a laser beam to fuse metals together without filler material. It offers advantages like narrow welds, low distortion, and the ability to weld dissimilar and high-alloy metals. However, it also has high costs and limitations such as difficulty welding thick joints.
This document discusses various surface coating methods used to improve wear and corrosion resistance of materials. It provides details on several coating techniques including thermal spraying methods like flame spraying, plasma spraying and HVOF. The key points are:
1) Different coating methods like thermal spraying, vapor deposition, mechanical cladding are used to improve surface properties.
2) Thermal spraying techniques like flame spraying, plasma spraying and HVOF are described in detail along with the coating materials, temperatures involved and applications.
3) Characteristics of different coatings like hardness, porosity and adhesion strength obtained from various spraying methods are summarized in tables for comparison.
Nickel-based superalloys have good strength and oxidation resistance at high temperatures up to 550°C. They are heat resistant, strong, and corrosion and oxidation resistant at temperatures from 760-980°C. There are three types: nickel base, nickel-iron base, and cobalt base. The microstructure contains a γ (gamma) phase matrix and γ' (gamma prime) precipitate phase which are face centered cubic. Various carbide phases form on grain boundaries. Alloying elements like chromium, aluminum, and titanium provide solid solution strengthening and precipitation strengthening through the γ' phase. Superalloys are used in gas turbine engines, rockets, nuclear reactors, and other high-temperature applications.
This document summarizes various surface treatment techniques including mechanical processes like shot peening and deep rolling that modify the surface without changing chemistry, thermal processes like electron beam treatment and laser treatment, and thermo-chemical processes like carburizing, nitriding, and carbonitriding that diffuse elements like carbon or nitrogen into the surface. It provides details on the mechanisms, advantages, and applications of these different surface modification methods.
The document discusses the process of sintering, which involves heating powdered materials below their melting point to bond particles together through atomic diffusion. Sintering reduces porosity and improves material properties. It explains the stages of sintering - initial neck growth, intermediate pore channel closure, and final pore shrinkage. Different sintering mechanisms are described, including surface, grain boundary, and lattice diffusion. Solid-state, liquid-phase, and reactive sintering types are also summarized. Key sintering parameters and the advantages and disadvantages of the process are presented.
This document discusses thermal spray coating processes. It describes various thermal spray methods like flame spraying, arc spraying, plasma spraying, and cold spraying. These methods create coatings through different combinations of melted or partially melted spray materials applied at high velocities. The document compares coating properties like hardness, porosity, and adhesion achieved through different spray methods. It outlines applications of thermal spray coatings for wear resistance, corrosion protection, and high temperature applications in industries like oil and gas, aerospace, and automotive.
Selective leaching, also called de-alloying or de-metalification, refers to the selective removal of one element from an alloy by corrosion processes. A common example is the dezincification of brass, where zinc is selectively removed leaving a porous copper structure. There are three steps in the mechanism of dezincification: (1) dissolution of the entire alloy, (2) replating of the more noble metal (copper), and (3) leaching away of the active metal (zinc). Dezincification can occur uniformly or in localized plugs and is caused by water containing sulfur, carbon dioxide, and oxygen. Prevention methods include using less susceptible alloys, adding inhibitors like tin
Erosion wear behaviour of plasma sprayed ni crsibEbe Nezer G
The document discusses several studies on erosion wear behavior and coatings:
1) One study examines the erosion wear behavior of a plasma sprayed NiCrSiB/Al2O3 composite coating on AISI 304 steel. Testing found the coating protects the substrate at 30° and 90° impact angles.
2) Another study evaluates the cavitation erosion and corrosion resistance of WC-CoCr and FeCrSiBMn coatings deposited by HVOF spraying. The WC-CoCr coating showed better resistance in NaCl solution.
3) A third study optimizes NiCrSiB/WC-Co coatings deposited by HVOF using Taguchi methods. Testing identified standoff distance and powder
This document presents research on developing a lead-free and environmentally-friendly substitute for PVDF polymer composites. It investigates using potassium sodium niobate (KNN) ceramic as a filler material in a polyacrylonitrile (PAN) polymer matrix composite. KNN is identified as a promising substitute due to its comparable piezoelectric and dielectric properties to lead-based ceramics, as well as being non-toxic. The document outlines the experimental process of fabricating PAN/KNN composites and evaluating their properties through various characterization techniques. Future work is proposed to further optimize the composite properties by controlling parameters like KNN particle size and volume fraction in the polymer matrix.
This document discusses research into developing monolithically integrated cadmium telluride (CdTe) solar cell devices deposited via atmospheric pressure metal-organic chemical vapor deposition (AP-MOCVD). The research aims to improve the fabrication process and efficiency of CdTe modules. Key steps studied include AP-MOCVD deposition of CdZnS/CdTe layers, addition of back contacts via thermal evaporation or screen printing, monolithic integration via mechanical scribing, and characterization of solar cell performance. Issues addressed include delamination, improving scribing precision, and damage to scribing tips. The goal is to advance the process from single solar cells to interconnected photovoltaic modules.
Detecting of NH3, CO2 polluted gases by using ZnO- In2O3 thin filmsijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
Detecting of NH3, CO2 polluted gases by using ZnO- In2O3 thin filmsijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
This document summarizes research on the structural, optical, and electrical properties of flower-like zinc oxide (ZnO) thin films deposited by chemical bath deposition. X-ray diffraction analysis showed the films had a hexagonal wurtzite crystal structure. The crystallite size increased slightly with higher annealing temperatures from 47.6-50.3 nm. Optical transmission was over 60% in the visible range and bandgap decreased from 3.23 to 3 eV with increasing annealing temperature. Scanning electron microscopy revealed flower-shaped grains several nanometers in size. Electrical conductivity increased with higher annealing temperature as measured by four-probe method.
High performance solid-oxide fuel cell-Opening windows to low temperature app...Ye Zhang-Steenwinkel
1) Researchers developed a solid oxide fuel cell design capable of producing high power densities of 1050 mW/cm^2 at 873 K using hydrogen fuel through three optimizations: using La0.6Sr0.4CoO3−δ perovskite as the low-temperature cathode material, integrating an optimized Ce0.8Gd0.2O1.9 interdiffusion barrier layer, and optimizing the anode substrate microstructure by increasing porosity.
2) The key challenge for operating SOFCs at low temperatures is the relatively high cell resistance resulting in low power output, but this design achieved high performance through the optimizations.
3) Physical vapor deposition and screen printing
Spray pyrolysis is a technique used to prepare oxide films, ceramic coatings, and nanoparticles. It involves atomizing a precursor solution containing metal salts, transporting the sprayed droplets to a heated substrate, and pyrolyzing the salts to form the desired material. Some key advantages of this technique are its simplicity, low cost, versatility for multi-layer deposition, and ability to produce materials for a variety of applications including solar cells, gas sensors, and solid oxide fuel cells. The morphology and properties of films produced can be controlled through parameters like substrate temperature, precursor solution composition, and flow rate.
The document summarizes research on the chemical solution deposition of CaCu3Ti4O12 (CCTO) thin films. Key findings include:
1) Polycrystalline pure phase CCTO thin films with preferential (220) orientation were obtained after sintering at 750°C. The films exhibited a bimodal grain size distribution.
2) The dielectric constant (k) of a film sintered at 750°C was approximately 2000 and the loss factor (tan δ) was approximately 0.05, as measured at 1 kHz.
3) X-ray diffraction and scanning electron microscopy analysis showed the films had a polycrystalline cubic perovskite structure with exaggerated grain growth
3.an update on nano coatings to mitigate corrosion (1)EditorJST
In real time situation machine members are subjected to variable and impact loading experience displacement patterns that may through loading of beam members beyond the yield stress. This causes permanent deformations and excessive fatigue making the beam weak and unserviceable
Influence of Manganese doping on Structural, optical and ethanol sensing of S...IRJET Journal
This document summarizes research on the influence of manganese doping on the structural, optical, and ethanol sensing properties of copper oxide thin films synthesized using successive ion layer adsorption and reaction technique. Key findings include:
- X-ray diffraction analysis showed manganese doping reduced grain size up to 5% doping due to increased microstrain, beyond which grain size increased.
- Optical studies found the band gap increased with doping up to 5% due to the Burstein-Moss effect, then decreased with further doping likely due to excess manganese in interstitial sites.
- The 5% doped film exhibited the highest sensitivity of 87% for detecting 1500 ppm ethanol at
Characterization Studies of CdS Nanocrystalline Film Deposited on Teflon Subs...IJLT EMAS
In this article, different substrates for deposition of
CdS material have been discussed. Till date glass, mica, quartz,
ceramic, etc. are commonly employed substrates in thin film
growth. In the present work, CdS is deposited on Teflon
substrate by chemical bath deposition (CBD) method. Also the
films were deposited on different substrates like glass, copper
and zinc and compared with those prepared on Teflon substrate.
The films prepared on Teflon substrate were uniform, stable and
also showed good radiating property. These films were further
characterized by UV-VIS absorption spectral studies, SEM and
EDS studies.
Ultra smooth and lattice relaxed zn o thin films [eid]Eid Elsayed
The crystal structure and quality of ZnO thin films were enhanced by high temperature vacuum annealing. 150 nm thick ZnO films were deposited on a-plane sapphire substrates by RF sputtering at 600°C and then annealed in situ at temperatures from 700°C to 900°C. Higher annealing temperatures produced smoother films with root mean square roughness reaching 0.3 nm at 850°C. Raman spectroscopy showed the A1(TO) mode at all annealing temperatures and the A1(LO) mode appeared above 800°C, indicating improved crystal quality. X-ray diffraction revealed narrower diffraction peaks and a relaxed lattice constant matching bulk ZnO at 900°C annealing, demonstrating high quality c-axis oriented epit
Preparation and Investigation on Properties of Cryogenically Solidified Nano ...IJERA Editor
In the present work, AL-alloy containing 12% silicon (LM 13) matrix nano composites were fabricated in sand moulds by using copper end blocks of copper end chill thickness 10 &15 nm with cryogenic effect . The size of the reinforcement (NanoZro2) ranges from 50-80nm being added ranges from 3 to 15 wt % in steps of 3 wt % . Cryogenically solidified Nano Metal Matrix Composites were compressed by using hydraulic compression machine. Specimens were prepared according to ASTM standards and tested for their strength, hardness and fracture toughness. Micro structural studies of the fabricated Nano Composites indicate that there is uniform distributions of reinforcements in the matrix materials (LM 13). An increasing trend of hardness, UTS & fracture toughness has been observed. The best results have been obtained at 12 wt %. The results were further justified by comparing two copper end chill thickness 10 &15 mm. Finally the Volumetric Heat Capacity of the cryo-chill is identified as an important parameter which affects mechanical properties.
This document presents an overview of a thesis on characterizing an aluminum-doped conductive layer of zinc oxide for thin film solar cells. It discusses preparing the aluminum-doped zinc oxide layer using a sol-gel method, including solution preparation, spin coating, and annealing. It also summarizes methods used to characterize the layer, including measuring thickness, surface morphology, and electrical properties using Hall effect measurement. Key results found the layer thickness and roughness increased with more depositions and the material exhibited n-type conductivity.
Tribology of TBC_118CR0680_Asish Nayak.pptxAsishNayak16
The document summarizes a study on the tribological properties of nanostructured zirconia coatings deposited by atmospheric plasma spraying on stainless steel substrates. Three different plasma powers were used to spray the coatings. Each sample was then tested for hardness, surface roughness, and tribological properties using a pin-on-disc tribometer. Testing found that the sample deposited at 32kW plasma power exhibited the best mechanical and tribological characteristics, including reduced friction coefficient, higher wear resistance, increased hardness, and smoother surface. Examination of the coatings found they had a nanostructured morphology and analysis showed the coatings improved tribological performance compared to conventional coatings.
Electric vehicle and photovoltaic advanced roles in enhancing the financial p...IJECEIAES
Climate change's impact on the planet forced the United Nations and governments to promote green energies and electric transportation. The deployments of photovoltaic (PV) and electric vehicle (EV) systems gained stronger momentum due to their numerous advantages over fossil fuel types. The advantages go beyond sustainability to reach financial support and stability. The work in this paper introduces the hybrid system between PV and EV to support industrial and commercial plants. This paper covers the theoretical framework of the proposed hybrid system including the required equation to complete the cost analysis when PV and EV are present. In addition, the proposed design diagram which sets the priorities and requirements of the system is presented. The proposed approach allows setup to advance their power stability, especially during power outages. The presented information supports researchers and plant owners to complete the necessary analysis while promoting the deployment of clean energy. The result of a case study that represents a dairy milk farmer supports the theoretical works and highlights its advanced benefits to existing plants. The short return on investment of the proposed approach supports the paper's novelty approach for the sustainable electrical system. In addition, the proposed system allows for an isolated power setup without the need for a transmission line which enhances the safety of the electrical network
DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODELgerogepatton
As digital technology becomes more deeply embedded in power systems, protecting the communication
networks of Smart Grids (SG) has emerged as a critical concern. Distributed Network Protocol 3 (DNP3)
represents a multi-tiered application layer protocol extensively utilized in Supervisory Control and Data
Acquisition (SCADA)-based smart grids to facilitate real-time data gathering and control functionalities.
Robust Intrusion Detection Systems (IDS) are necessary for early threat detection and mitigation because
of the interconnection of these networks, which makes them vulnerable to a variety of cyberattacks. To
solve this issue, this paper develops a hybrid Deep Learning (DL) model specifically designed for intrusion
detection in smart grids. The proposed approach is a combination of the Convolutional Neural Network
(CNN) and the Long-Short-Term Memory algorithms (LSTM). We employed a recent intrusion detection
dataset (DNP3), which focuses on unauthorized commands and Denial of Service (DoS) cyberattacks, to
train and test our model. The results of our experiments show that our CNN-LSTM method is much better
at finding smart grid intrusions than other deep learning algorithms used for classification. In addition,
our proposed approach improves accuracy, precision, recall, and F1 score, achieving a high detection
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Embedded machine learning-based road conditions and driving behavior monitoringIJECEIAES
Car accident rates have increased in recent years, resulting in losses in human lives, properties, and other financial costs. An embedded machine learning-based system is developed to address this critical issue. The system can monitor road conditions, detect driving patterns, and identify aggressive driving behaviors. The system is based on neural networks trained on a comprehensive dataset of driving events, driving styles, and road conditions. The system effectively detects potential risks and helps mitigate the frequency and impact of accidents. The primary goal is to ensure the safety of drivers and vehicles. Collecting data involved gathering information on three key road events: normal street and normal drive, speed bumps, circular yellow speed bumps, and three aggressive driving actions: sudden start, sudden stop, and sudden entry. The gathered data is processed and analyzed using a machine learning system designed for limited power and memory devices. The developed system resulted in 91.9% accuracy, 93.6% precision, and 92% recall. The achieved inference time on an Arduino Nano 33 BLE Sense with a 32-bit CPU running at 64 MHz is 34 ms and requires 2.6 kB peak RAM and 139.9 kB program flash memory, making it suitable for resource-constrained embedded systems.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
Introduction- e - waste – definition - sources of e-waste– hazardous substances in e-waste - effects of e-waste on environment and human health- need for e-waste management– e-waste handling rules - waste minimization techniques for managing e-waste – recycling of e-waste - disposal treatment methods of e- waste – mechanism of extraction of precious metal from leaching solution-global Scenario of E-waste – E-waste in India- case studies.
We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
International Conference on NLP, Artificial Intelligence, Machine Learning an...gerogepatton
International Conference on NLP, Artificial Intelligence, Machine Learning and Applications (NLAIM 2024) offers a premier global platform for exchanging insights and findings in the theory, methodology, and applications of NLP, Artificial Intelligence, Machine Learning, and their applications. The conference seeks substantial contributions across all key domains of NLP, Artificial Intelligence, Machine Learning, and their practical applications, aiming to foster both theoretical advancements and real-world implementations. With a focus on facilitating collaboration between researchers and practitioners from academia and industry, the conference serves as a nexus for sharing the latest developments in the field.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
2. Introduction
Thermal barrier coatings (TBC) are ceramic layers deposited
over metallic parts in order to provide their thermal insulation
from the high temperature conditions.
Reduce the material losses from the functional surfaces which
are working at high temperature.
TBC enables engines to operate at temperatures above the
melting temperature of the superalloy.
2
3. Structure of TBC
Bond Coat with a thickness of about
75-100 μm providing strong
adhesion of the outer ceramic layer
to the substrate surface
Thermally-grown oxide (TGO) layer
of about 0.1-10 μm thick has a
structure that has low diffusivity for
oxygen.
The ceramic topcoat of thickness
100-300 μm is having very low
thermal conductivity.
3
4. Material Selection
Low thermal conductivity
Matched coefficient of thermal expansion
(CTE)
Thermal stability
4
5. TBC deposition methods
As stated earlier the Thermal Barrier Coatings can be
produced in industries by the following methods:
1. Air Plasma Spray (APS)
2. Electron Beam Physical Vapour Deposition (EBPVD)
3. High Velocity Oxygen Fuel (HVOF)
4. Electrostatic Spray Assisted Vapour Deposition (ESAVD)
5. Direct Vapour Deposition (DVD)
5
8. Enhancement of hot corrosion resistance of
thermal barrier coatings by using nanostructured
Gd2Zr2O7 coating
YSZ coatings have a functional operational limit of about
1200 °C due to sintering.
Low quality fuels often possess impurities such
as vanadium and sodium, which give rise to formation of
V2O5 and Na2SO4 salts on the surface of gas turbines
The recent studies on TBCs are mainly focused on finding
new materials with two approaches: (1) substitution of Zr-
based coatings and (2) finding better stabilizers
Rare earth zirconates have the general composition of
A2B2O7 with pyrochlore crystal structure
A is a 3-positive charge cation (La, Gd, …)
B stands for tetravalent cation (Zr, Hf, Ce, …)
8
9. 1) Experimental procedures
1.1. Synthesis of GZ nano-powder by co-precipitation method
Gadolinium oxide was dissolved in HCl to release Gd3+ ion
Zirconium oxychloride was dissolved in distilled water
The obtained precipitants were washed by distilled water and then
filtered and dried at 70 °C for 24 h
The powders were calcinated at 1000 °C for 2 h
1.2. Nano-GZ granulation
Nanopowders should able to be sprayed by APS method
About 20 wt% of synthesized GZ nanopowder was added to distilled
water along with 0.7 wt% Polyvinyl alcohol (PVA) and stirred for 2 h
To prevent precipitation of GZ nanopowders, they were immediately
granulated by spray-dryer
9
10. Continued...
1.3. Procedure for applying of TBC
Nickel-based superalloy (IN-738LC) as substrate
Table 1. Chemical compositions of the substrate used in this study and IN 738LC
Prior to the coating, the surface oxide of samples was removed with
sandblasting by alumina particles with grain size of 50–80 mesh under
pressure of 40–50 psi. The samples then rinsed, ultrasonically cleaned in
acetone and finally dried.
10
12. Two bond/top coat systems of CoNiCrAlY/conventional YSZ and
CoNiCrAlY/nanostructured GZ coatings were applied
150-micron thick bond coat and 300-micron top coat
Table 2. Parameters of plasma spraying
12
13. 4. Hot corrosion test
a mixture of 55 wt% V2O5 and 45 wt% Na2SO4 was prepared. About 30
mg/cm of the mixture was placed on the sample surfaces
Samples were heated from room temperature to 950 °C.
After each 4 h, the sample surface was investigated
Field emission scanning electron microscope (FESEM/EDS,
MIRA3TESCAN-XMU and Xray diffraction ((XRD, Philips X'pert) Cu Kα,
40 kV, 30 mA, Step size: 0.02°) were also employed for determination of
structural and phase constituents of the coatings before and after hot
corrosion test.
13
14. 2) Results and Discussion
2.1. Synthesized Nano-GZ
Presence of single phase Gd2Zr2O7 (JCPDS: # 01-080-0471)
indicates that synthesis and calcination of GZ powder is
successful
Fig. 3. Results of XRD analysis for GZ after calcination
14
15. 15
Fig. 4. FE-SEM photograph of the GZ powder prepared by co-precipitation method
(a) before calcination and (b) after calcination
• Calcinated powders were composed of small bulks with multi-
faceted irregular shapes.
16. 16
Fig. 5. Morphology of nanostructured GZ powder: (a) agglomerated particles; (b) an
agglomerate at higher magnification.
• Since fine particles with irregular shapes do not have good flow-
ability for plasma spray purposes, the synthesized powder was
granulated by spray-dryer technique.
17. 3.2. Microstructure and phase investigation of as-
sprayed coatings
17
Fig. 6. FE-SEM image of the (a) surface and (b) cross section of
CoNiCrAlY/conventional YSZ coating.
Fig. 7. FE-SEM image of the (a) surface and (b) cross section of
CoNiCrAlY/nanostructured GZ coating.
18. Porosities of the different layers, as measured by image processing, were
found to be approximately 3–5% for the CoNiCrAlY layer, 12–15% on the
YSZ layer and 7–10% on the GZ layers
In conventional YSZ coating pores and microcracks can be observed in the
cross section of both layers and also in outer surface of the coating. While
in nanostructured GZ made from ultrafine particles in the pores
inhomogeneities are reduced considerably
18
Fig. 8. FE-SEM micrograph of the fracture surface of
(a) CoNiCrAlY/conventional YSZ (b) CoNiCrAlY/nanostructured GZ coatings
19. 19
Fig. 9. XRD patterns from the surface of (a)
conventional YSZ and (b) nanostructured GZ coatings
X-ray diffraction analysis was
carefully studied to ensure the
formation of the tetragonal
structure and the absence of
the cubic structure in the YSZ
coating. Cubic structure of
zirconia could be distinguished
from the tetragonal structure by
the presence
20. 2.3. Microstructure of the coatings after hot
corrosion test
20
Fig. 10. FE-SEM image of CoNiCrAlY/conventional YSZ coating after 20 h
corrosion test.: (a) the surface; (b) the cross section.
Fig. 11. FE-SEM image of CoNiCrAlY/nanostructured GZ coating after 28 h
corrosion test.: (a) the surface; (b) the cross section
21. Conventional YSZ and nanostructured GZ layers have cracks and
spallation near the CoNiCrAlY layer. The thermal expansion
mismatch is one of the key factors
CTE is 8–9 × 10−6 K−1 for GZ
10.5–11.5 × 10−6 K−1 for 8YSZ
15.0 × 10−6 K−1 at 1000 °C for CoNiCrAlY
Another reason for the crack propagation of GZ and YSZ coatings is
its low fracture toughness (~1 MPa·m for GZ coating, and ~2
MPa·m for 8YSZ coating)
21
22. 3 . Conclusion
CoNiCrAlY/nanostructured Gd2Zr2O7 is more resistant to hot
corrosion than CoNiCrAlY/conventional YSZ.
The improved hot corrosion resistance could be explained by
the change of structure to a dense and more packed
structure in the nano-coating.
Sodium sulfate and vanadium oxide dissolve the stabilizer of
the zirconia at high temperatures; hence, resulting
crack, spallation of surface layers of conventional YSZ and
nanostructured Gd2Zr2O7 TBCs.
Gd2O3 has a higher acidity than Y2O3 which means that the
driving force of reaction Y2O3 + NaVO3 is larger than that of
reaction Gd2O3 + NaVO3. Therefore, Gd2Zr2O7 is more
resistant to hot corrosion than YSZ.
22
23. References
M. Bahamirian , S.M.M. Hadavi , M. Farvizi , M.R. Rahimipour , A.
Keyvani
Enhancement of hot corrosion resistance of thermal barrier coatings by
using nanostructured Gd2Zr2O7 coating
Surface and Coatings Technology volume360, 25 February 2019,
Pages 1-12
Wikipedia https://en.wikipedia.org/wiki/Thermal_barrier_coating
NPTEL https://nptel.ac.in/courses/112107248/23
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