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| Abstract No.: |
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Scheduled at:
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Wednesday, May 05, 2010, Olivia Room 11:40 AM
Properties 2
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| Title: |
Comparative study of splat morphology and the splat-substrate interactions for NiCr sprayed on to stainless steel by both plasma and HVOF spraying
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| Authors: |
Sophie Brossard / University of new South Wales, Australia
Paul R. Munroe* / University of New South Wales, Australia
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| Abstract: |
The various thermal spraying processes available include the plasma process, which uses a plasma flame to melt a fine powder before it is sprayed onto a substrate, and the High Velocity Oxy-Fuel (HVOF) spray process, in which the flame is made from the combustion of oxygen. These methods differ in the temperature and velocity with which the molten particles impact the substrate, leading to different coating characteristics. This includes differences in the splat morphology and the nature of microstructural interactions at the splat-substrate interface, that is, features such as local melting of the substrate, the existence of porosity and formation of oxides. For this study a nickel-chromium powder was sprayed onto mirror-polished stainless steel substrates using both techniques to form single splats. These splats and their interface with the substrate were characterized using a range of microstructural characterization techniques and the observed differences were linked to the different spray conditions.
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