Evidence of Substrate Melting of NiCr Particles on Stainless Steel Substrate by Experimental Observation and Simulations |
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Authors: | A T T Tran S Brossard M M Hyland B J James P Munroe |
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Institution: | (1) Chemical & Materials Engineering Department, The University of Auckland, 8th Floor, Tower Block, Engineering Building, 20 Symonds Street, Auckland, 1142, New Zealand;(2) School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW, Australia |
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Abstract: | Single NiCr splats were plasma-sprayed onto a polished stainless steel substrate held at room temperature. The splat-substrate
interface was characterized by focused ion beam and transmission electron microscopy. The frequent observation of NiO particles,
particularly in pores within the splat, and at the periphery of splat, suggests that the principal oxidation process occurs
at the substrate surface, where the splats are exposed to a water vapor-rich environment. It was also observed that the splat
adhered well in some locations where elemental-diffusion and jetting of the substrate occurred, suggestive of substrate melting.
A three-dimensional numerical model was developed to simulate the impact of a splat onto a substrate. The simulation shows
that the observation of the central pore in the splat and the phenomenon of substrate melting may occur. Based on these results,
the effect of water release on oxide formation and splat morphology can be explained. |
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