Transition Metal Coatings on Graphite via Laser Processing
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This presentation was made by Deepak Rajput at the International Congress on Applications of Lasers and Electro-Optics in Orlando (on November 3, 2009).
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![Transition Metal Coatings on Graphite Via Laser Processing D. Rajput*, L. Costa, K. Lansford, A. Terekhov, G. Murray, W. Hofmeister Center for Laser Applications University of Tennessee Space Institute Tullahoma, Tennessee 37388-9700 * Email: [email_address] Web: http://cla.utsi.edu](https://image.slidesharecdn.com/icaleo2009-091218164313-phpapp01/85/Transition-Metal-Coatings-on-Graphite-via-Laser-Processing-1-320.jpg)
![Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Using FreeBSD to Design a Secure Digital Cinema Server (Usenix 2004)
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Ceramic Nanomaterials for High Temperature Applications - Crimson Publishers
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Role of Diamond Nanoparticles in Ni Based Protective Coatings-Crimson Publishers
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Surface engineering involves modifying the surface properties of materials to make them more robust and resistant to degradation from environmental interactions. It can improve properties like corrosion and wear resistance. There are many traditional surface engineering techniques like painting, electroplating, and thermal spraying as well as more advanced methods such as physical vapor deposition, chemical vapor deposition, ion implantation, and laser treatment. Surface engineering provides benefits like reduced costs, extended product lifetimes, and improved performance and is used in many industries.
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This document summarizes a study that investigated the surface characteristics of oxide films formed on Ti-6Al-4V alloy by spark anodization in H2SO4/H3PO4 electrolyte at different voltages. The results showed that increasing the anodization voltage increased the pore diameter and porosity of the oxide layer. Higher voltages also produced thicker oxide layers and rougher surfaces. Analysis found the layers incorporated elements from the electrolyte and consisted of crystalline anatase. Electrochemical testing indicated the impedance behavior was affected by the space charge region, inner compact layer and outer porous layer, and that corrosion resistance decreased with higher voltages.
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This presentation was made as a seminar requirement by Deepak Rajput at the University of Tennessee Space Institute, Tullahoma, Tennessee, USA in spring 2010.
Please visit http://drajput.com.
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Final report on Laser Shock Peening of Bulk Metallic Glasses submitted by Deepak Rajput at the University of Tennessee at Knoxville.
This experiment was not so fruitful. Also, there is a mistake in the concept of "overlap". However, this was the first ever attempt on laser shock processing of bulk metallic glasses.
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Transition Metal Coatings on Graphite via Laser Processing
- 1. Transition Metal Coatings on Graphite Via Laser Processing D. Rajput*, L. Costa, K. Lansford, A. Terekhov, G. Murray, W. Hofmeister Center for Laser Applications University of Tennessee Space Institute Tullahoma, Tennessee 37388-9700 * Email: [email_address] Web: http://cla.utsi.edu
- 11. LISI TM on Graphite C L A
- 12. LISI TM on Graphite 1,2,12,13 – Overhead laser assembly; 4 – Argon; 16,17 – mechanical & turbo pumps 7 – sample, 8 – alumina rods, 9 – induction heating element, 18 – RF supply. Two-step Processing Chamber
- 13. LISI TM on Graphite Process variables: laser power (W), scanning speed (mm/s) focal spot size (mm), laser pass overlap (%), T = 800 o C Copper induction heating element y x Graphite track x y z
- 15. LISI TM on Graphite Precursor details Optimized laser processing conditions Coating Laser power (W) Spot size (mm) Scanning speed (mm/s) Overlap (%) Titanium 235 1.28 5 86 Zirconium 290 0.81 5 78 Niobium 348 0.93 5 81 Metal Particle size ( µ m) Binder (weight %) Precursor thickness (µm) Titanium < 44 60 75 Zirconium 2 – 5 10 125 – 150 Niobium < 10 33 125
- 17. Results: Titanium SEM micrographs of the titanium coating. XRD of the titanium coating surface (A) and its interface with the graphite substrate (B) Oxygen: LISI TM binder or traces in the chamber 900-1100 HK
- 18. Results: Zirconium SEM micrographs of the zirconium coating Delamination and crack appear in some locations XRD of the zirconium coating surface (A) and its interface with the graphite substrate (B) ~ 775 HK
- 19. Results: Niobium SEM micrographs of the niobium coating XRD of the niobium coating surface (A) and its interface with the graphite substrate (B) 620-1220 HK
- 22. SIMS of the Niobium Coating A: Potassium, B: Magnesium C: Oxygen, D: Carbon Mass Spectrum A: as received B: slightly ground Chemical Image of as received Nb coating