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| Abstract No.: |
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Scheduled at:
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Wednesday, May 21, 2014, Hall H3 11:30 AM
Properties Characterization & Testing Methods
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| Title: |
Shrouded plasma sprayed Cr3C2-NiCr coatings: Effect of shroud-substrate distance
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| Authors: |
Steven Matthews* / School of Engineering and Advanced Technology
Massey University
Private Bag 102 904
North Shore Mail Centre , New Zealand
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| Abstract: |
Thermal spraying of carbide composites typically aims to minimise carbide dissolution in flight. In this work the aim is instead to maximise carbide dissolution during spraying to form a coating composed of a supersaturated solid solution of Ni, Cr and C. Heat treatments will then be used to generate tailored carbide microstructures through carbide precipitation in the coating. Shrouded plasma spraying is used to generate rapid NiCr binder melting and carbide dissolution within the particles, while minimising carbon loss through oxidation. A previous paper has explored the effect of different plasma spray and shrouding parameters on these coatings, but only at a fixed spray distance of 100mm. This new paper will extent this research by exploring the effect of different spray distances, and therefore different shroud-substrate distances, for two shrouding systems, on the coating properties under different plasma spray parameters. The effect of spray distance on the mechanism of carbon loss will be discussed.
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