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 presentation is related to the plasma spraying that covers the principle of working, setup, advantages - Limitations along with the factors affecting the overall process.
What is laser beam hardening (LBH)? Advantages, Disadvantages
Applications, What is laser peening? Difference between laser beam hardening (LBH) and electron beam hardening (EBH)
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.
What is laser beam hardening (LBH)? Advantages, Disadvantages
Applications, What is laser peening? Difference between laser beam hardening (LBH) and electron beam hardening (EBH)
Selective Laser Sintering is one of the most used processes of Rapid Prototyping. It is a powder based process where powder of different metals/materials get sintered by LASER.
what is laser hardening
process of laser hardening
hardening of cast iron
process variables
differences with other conventional process
advantages and disadvantages
Laser shock peening produces a compressive residual stress in the surface of metallic materials, which significantly increases fatigue life in applications where failure is caused by surface-initi ated cracks. Laser shock peening is applied by using a high energy pulsed laser to create a high amplitude stress wave or shock wave on the surface to be treated. This stress wave propagates into the material, causing the surface layer to yield and plastically deform, and thereby, develop a residual compressive stress. Where comparisons have been made to shot peening, the magnitude of the residual stresses at the surface are similar, but the compressive stresses from laser peening extend much deeper below the surface than those from shot peening. The resulting fatigue life enhancement is often greater for laser peering than it is for shot peening. In addition to fatigue strength improvement, laser peering can also locally strain harden thin sections of parts or strain harden a surface
Heat treatment 2 by
P.SENTHAMARAI KANNAN,
ASSISTANT PROFESSOR ,
DEPARTMENT OF MECHANICAL ENGINEERING,
KAMARAJ COLLEGE OF ENGINEERING AND TECHNOLOGY,
VIRUDHUNAGAR, TAMILNADU.
INDIA.
A brief knowledge about surface treatment, which is a process applied to the surface of a material to make it better in some way, for example by making it more resistant to corrosion or wear. Shot peening is a surface treatment in which small hard pellets are shot against the surface of a metal to make it more resistant to fatigue.
Investigation on corrosion behaviour of mild steel using al, zn, ni cr coatin...IJLT EMAS
Mild steel is the base material most commonly and
widely used in ship and pipe building material. The purpose of
this project is to analyse the different coating material like
aluminium, zinc and Nichrome using thermal spray process and
to select the suitable coating material for mild steel which resists
corrosion better. The main aim of this research is to analyse the
corrosion of coated mild steel in its first stages, in order to
determine its corrosion rate and to select the suitable coating
material for corrosion resistance of mild steel.
Selective Laser Sintering is one of the most used processes of Rapid Prototyping. It is a powder based process where powder of different metals/materials get sintered by LASER.
what is laser hardening
process of laser hardening
hardening of cast iron
process variables
differences with other conventional process
advantages and disadvantages
Laser shock peening produces a compressive residual stress in the surface of metallic materials, which significantly increases fatigue life in applications where failure is caused by surface-initi ated cracks. Laser shock peening is applied by using a high energy pulsed laser to create a high amplitude stress wave or shock wave on the surface to be treated. This stress wave propagates into the material, causing the surface layer to yield and plastically deform, and thereby, develop a residual compressive stress. Where comparisons have been made to shot peening, the magnitude of the residual stresses at the surface are similar, but the compressive stresses from laser peening extend much deeper below the surface than those from shot peening. The resulting fatigue life enhancement is often greater for laser peering than it is for shot peening. In addition to fatigue strength improvement, laser peering can also locally strain harden thin sections of parts or strain harden a surface
Heat treatment 2 by
P.SENTHAMARAI KANNAN,
ASSISTANT PROFESSOR ,
DEPARTMENT OF MECHANICAL ENGINEERING,
KAMARAJ COLLEGE OF ENGINEERING AND TECHNOLOGY,
VIRUDHUNAGAR, TAMILNADU.
INDIA.
A brief knowledge about surface treatment, which is a process applied to the surface of a material to make it better in some way, for example by making it more resistant to corrosion or wear. Shot peening is a surface treatment in which small hard pellets are shot against the surface of a metal to make it more resistant to fatigue.
Investigation on corrosion behaviour of mild steel using al, zn, ni cr coatin...IJLT EMAS
Mild steel is the base material most commonly and
widely used in ship and pipe building material. The purpose of
this project is to analyse the different coating material like
aluminium, zinc and Nichrome using thermal spray process and
to select the suitable coating material for mild steel which resists
corrosion better. The main aim of this research is to analyse the
corrosion of coated mild steel in its first stages, in order to
determine its corrosion rate and to select the suitable coating
material for corrosion resistance of mild steel.
Plasma Technology In Metallurgy & Metal Working IndustryRajesh Joshi
Presentation on Plasma Technology Uses In Metallurgy & Metal Working Industry By Mr. Arun Kumar (Managing Director - Technocrats Plasma Systems Private Limited).
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.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Porous ceramics offer a broad range of characteristics that enable them to be used in a wide variety of applications. By selecting a suitable base
material for the intended use, and then adjusting the overall porosity, pore size distribution and pore shape, they can be tailored to suit a diverse range of applications. This generally requires close consultation
between the ceramics manufacturer and the customer or user.
PTA welding and overlay for Seat rings, Wedges, Seals, Globe of Flow control valves. • Disc, Nozzle, Inlet of safety valves.
• Valve Base & Seats of Automobiles, Marine Engines. • Edges of industrial Cutting knives, Extrusion
screws. • Pressure rollers of Pulp & Paper industries. • Components of Agricultural, Chemical,
Nuclear plants. • Screws of mixing plants like Rubber, Chemical etc.
Pultrusion is a continuous process for manufacture of composite materials with constant cross-section.
It is more widely used in industries where there is a continuous demand of the product
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Sachpazis:Terzaghi Bearing Capacity Estimation in simple terms with Calculati...Dr.Costas Sachpazis
Terzaghi's soil bearing capacity theory, developed by Karl Terzaghi, is a fundamental principle in geotechnical engineering used to determine the bearing capacity of shallow foundations. This theory provides a method to calculate the ultimate bearing capacity of soil, which is the maximum load per unit area that the soil can support without undergoing shear failure. The Calculation HTML Code included.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
2. INTRODUCTION
A coating is a relatively thin layer of material which is applied
to cover a substrate.
Coatings are applied for a variety of reasons.
Improve the surface properties of a substrate.
To obtain different properties such as thickness, porosity, , corrosion
resistance, wear resistance. and surface finish.
Coating acts as a protective layer in the different infrastructure like
pipelines, mining equipment’s and is used in many industries like
automotive, aerospace, oil and gas mining, shipbuilding etc.
Plasma spray is one of the most versatile techniques of the
thermal spray processes. Plasma is capable of spraying all
materials that are considered sprayable.
3. PRINCIPLE:
• The process involves injection of powder
particles into the plasma jet created by
heating an inert gas in an electric arc
confined within a water-cooled nozzle.
• The particles are accelerated and heated in
the plasma jet and then impact onto the
substrate
• The sudden deceleration causes a pressure
build-up at the particle– surface interface
that forces liquid material to flow laterally.
The liquid spreads outward from the point of
impact, solidifies and forms a lamella
• The coating is built by the piling of such
4. THE EXPERIMENTAL SET UP
The plasma spray system developed at the Laser & Plasma Technology Division,
Bhabha Atomic Research Centre, Mumbai, has been used for plasma spray
experiments.
1. DC Plasma Spray Torch
2. Power Supply
3. Control Panel
4. Gas Feeding System
5. Water Cooling Arrangement
6. Powder Feeder.
5. Plasma Spray Torch
The cathode consists of a tungsten rod with a conical
tip.
About 2% thorium oxide is added to tungsten to improve
the thermionic emission.
The anode is made of copper shaped as nozzle.
An insulating block of nylon encloses the electrodes.
The electrodes are intensely water-cooled
The plasma gas, usually argon, is used
The nozzle has a port near its edge for feeding
powders.
When an electric arc is struck between the cathode
and anode, the plasma gas extracts the energy from
the arc and issues out of the nozzle as a high
temperature, high velocity jet of Mach 2.
6. size of the powder = 10 to 80 um
plasma jet melts and the molten
particles, travelling at high
velocity about 100 m/s
The dimensions are:
nozzle diameter: 6 mm
gap between the cathode and anode
fixed at 12 mm
cathode length: 50 mm.
7. Power supply & Water cooling system
Power supply
The torch is energized by a power supply with an open circuit voltage of
80 V. The maximum current drawn could be 800 A DC.
It is cooled by forced air.
Water Cooling System
Water cooling system consists of 2 HP electric mono-block pump set,
reservoir, cooling tower and pipelines.
Water-cooling is made for power cables, power supply unit, cathode and
anode separately
There are water flow meters and thermometers for measurement of
water flow rate and inlet and outlet temperature respectively
8. Gas feeding &Powder feeding system
Gas feeding system
The gas feeding system consists of gas cylinders, pressure
gauges and gas tubes. The cylinders each have 7 m3
capacities.
The pressure was maintained at 7.5 Mpa
The carrier gas flow rate was chosen such that the powder
particles enter the plasma core.
Powder feeding system
At lower flow rate, the particles may not be able to enter
the core of the plasma leading to poor coating quality.
if the carrier gas flow is very large, the powder particles
will cross the central plasma zone without proper melting
leading to poor quality of coating.
The carrier gas flow rate needs to be optimized for each
particular powder
9.
10. Control Panel
The control panel displays the arc current, arc voltage, flow rate of gas, test/run
mode switches. It has also water flow and gas flow indication lamp.
Appropriate flow meters were used to monitor the plasma forming gas flow, Plasma
Coating rates. It also consists of the relays and solenoid valves and other interlocking
arrangements essential for safe running of the equipment.
For example, the arc can only be started if the cooling water supply is on and water
pressure & flow rate is adequate.
11. FACTORS AFFECTING THE PROCESS
1) Roughness of the substrate surface
A rough surface provides a good coating
adhesion.
A rough surface is generally created by shot
blasting technique.
The shots are kept inside a hopper, and
compressed air is supplied at the bottom of the
hopper. The shots used for this purpose are
irregular in shape, highly angular in nature, and
made up of hard material like alumina, silicon
carbide, etc. Upon impact they create small
craters on the surface by localized plastic
deformation, and finally yield a very rough and
highly worked surface.
12. 2)Gas Pressure
In an experiment performed the effect of
the gas inlet pressure on the velocity was
investigated and the results showed that
velocity increases with increase in the gas
pressure.
3) Particle Size
The decrease in particle size decreases
the porosity as the material melts easily.
13. 4)Arc power
It is the electrical power drawn by the arc. The power
is injected in to the plasma gas, which in turn heats
the plasma stream
Arc power determines the mass flow rate of a given
powder that can be effectively melted by the arc.
Increased Power ,In the case of steel, at some point
vaporization may take place lowering the deposition
efficiency.
14. 5)Plasma gas flow rate
The most commonly used gases for plasma generation are
argon, helium, hydrogen, nitrogen and air.
The major constituent of the gas mixture is known as
primary gas and the minor is known as the secondary gas.
6)Torch to base distance
It is the distance between the tip of the gun and the
substrate surface. A long distance may result in freezing of
the melted particles before they reach the target,
whereas a short standoff distance may not provide
sufficient time for the particles in flight to melt.
15. Advantages:
The plasma coatings are generally denser, stronger, and much cleaner than a
thermal spray process
It increases the life of component by 20 to 30% than the other traditional
coating processes
The plasma coating offers the shiny as well as the glazed look and
simultaneously improves the aesthetic look.
It gives good adhesion strength as well as the good case hardening strength.
16. Disadvantages
1. The process requires high initial setup cost.
2. It is a line-of-sight process, similar to all other thermal spraying processes,
making it difficult to coat internal bores of small diameters or restricted access
surfaces.
3.The process is only suitable for the batch production.
4. Due to the less interference of worker may lead to unemployment issues.
5. Due to the high initial cost it is impossible implement such techniques by small
scale industries.
17. Applications
•Seal ring grooves in the compressor area of aero-engine turbines with tungsten
carbide/cobalt to resist fretting wear.
•Zirconia-based thermal barrier coatings (TBCs) on turbine combustion chambers.
•Wear resistant alumina and chromium oxide ceramic on printing rolls for
subsequent laser and diamond engraving/etching.
•Molybdenum alloys on to diesel engine piston rings.
18. CONCLUSION
Surface coating improves the life of the component and reduces the cost of
replacement.
The purpose of surface technology is to produce functionally effective
surfaces. A wide range of coatings can improve the corrosion, erosion and
wear resistance of materials
19. Case study1: Effects of spray distance on the microstructure and
mechanical properties of plasma sprayed Ti-graphite coatings
Powder materials : Commercial Ti powder and graphite were used with mass ratio of
6:1 were wet-mixed by deionized water, sodium carboxymethyl cellulose and
Gum Arabic, and stirred by an electro-motion for 2 h to form slurry. Then
dispersed slurry was sprayed using feeding system.
Substrate :Mild carbon steel specimens with size of 10 mm × 10mm × 10
mm
Gas used :Argon, Nitrogen.
20. Case 2:Plasma sprayed diamond
reinforced molybdenum coatings
Coating thickness =250-280 µm
Powder: 90wt % of molybdenum powder + 10% mono-crystalline diamond
particles.
Mixing-The ball milling was continued for 36 hours at 500 rpm in a toluene
medium.
Powder obtained:40-70 µm
Substrate: Test coupons of dimension 50mm ×50mm ×6mm (thickness) were cut
off from rolled strips of AISI 52100 bearing steel
Heating Temperature : 3000K
21. References
Case study
1. Effects of spray distance on the microstructure and mechanical properties
of reactive plasma sprayed Ti-gaphite coatings
2. Das, P., Paul, S., & Bandyopadhyay, P. P. (2018). Plasma sprayed diamond
reinforced molybdenum coatings. Journal of Alloys and Compounds, 767, 448–
455.doi:10.1016/j.jallcom.2018.07.088