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Title: Investigation of cold gas dynamic spray process for electro technical applications
Researcher: Goyal, Tarun
Guide(s): Sidhu, T S
Walia, R S
Keywords: Mechanical Engineering
cold gas
Thermal Spray techniques
copper coatings
Upload Date: 17-May-2013
University: Punjab Technical University
Completed Date: 2012
Abstract: Thermal spraying is a group of coating processes in which finely divided solid metallic or non-metallic materials are deposited in a molten or semi molten condition to form the coating. Coatings are generated, if the particles can plastically deform at impact with the substrate, which may only happen if they are molten/semi molten or solid and sufficiently rapid. Their heating and/or acceleration are practical if they occur in a stream of gas. Cold gas dynamic spray technique commonly called as cold spray is a thermal spray coating process whereby the coating formation is achieved by using cold particles on cold substrate that is why name, cold spray. Other thermal spray techniques use the particle temperature as the criterion for achieving bonding with the substrate where as cold spray uses particle velocity as the principle. In this process, coatings are developed by exposing a metallic or dielectric substrate to a high velocity (300 1200 m/s) jet of small (1 50µm) particles accelerated by a supersonic jet of compressed gas. As the particle velocity forms the basis for coating formation, the harmful effects associated with high temperature i.e. oxidation, evaporation, melting, crystallization, debonding, gas release, phase transformation, formation of embrittling phases, segregation of alloying elements, residual stresses etc. are significantly reduced or eliminated in the cold spray process. As the cold-spray process does not normally involve the use of a high-temperature heat source, it generally offers a number of advantages over the thermal-spray material deposition technologies such as high velocity oxy-fuel, detonation gun, plasma spray, and arc spray. Other than eliminating the deleterious high temperature effects, cold sprayed coatings have good electrical and thermal conductivities. Cold spray of the materials like copper, solder and polymeric coatings offers exciting new possibilities for cost-effective and environmentally friendly alternatives to technologies such as electroplating.
Pagination: xl, 332p.
Appears in Departments:Department of Mechanical Engineering

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01_title.pdfAttached File30.13 kBAdobe PDFView/Open
02_dedication.pdf20.28 kBAdobe PDFView/Open
03_certificate.pdf61.68 kBAdobe PDFView/Open
04_abstract.pdf54.34 kBAdobe PDFView/Open
05_acknowledgement.pdf38.98 kBAdobe PDFView/Open
06_preface.pdf9.87 kBAdobe PDFView/Open
07_contents.pdf114.48 kBAdobe PDFView/Open
08_list of figures.pdf165.06 kBAdobe PDFView/Open
09_list of tables.pdf32.46 kBAdobe PDFView/Open
10_research papers.pdf101.62 kBAdobe PDFView/Open
11_abbreviations.pdf30.51 kBAdobe PDFView/Open
12_copyright declaration.pdf4.49 kBAdobe PDFView/Open
13_chapter 1.pdf238.54 kBAdobe PDFView/Open
14_chapter 2.pdf297.43 kBAdobe PDFView/Open
15_chapter 3.pdf39.18 kBAdobe PDFView/Open
16_chapter 4.pdf695.74 kBAdobe PDFView/Open
17_chapter 5.pdf305.22 kBAdobe PDFView/Open
18_chapter 6.pdf1.99 MBAdobe PDFView/Open
19_chapter 7.pdf1.52 MBAdobe PDFView/Open
20_chapter 8.pdf10.23 MBAdobe PDFView/Open
21_chapter 9.pdf34.59 kBAdobe PDFView/Open
22_chapter 10.pdf104.33 kBAdobe PDFView/Open
23_appendix.pdf6.06 MBAdobe PDFView/Open

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