Authors: A T T Tran M M Hyland
Publish Date: 2009/10/15
Volume: 19, Issue: 1-2, Pages: 11-23
Abstract
NiCr single splats were plasmasprayed on aluminum and stainless steel substrates which were modified by immersion in boiling water to grow specific types of oxide/oxyhydroxide on the surface It was observed that there was no splat formation on aluminum substrate In contrast a significant number of splats were formed on stainless steel substrate The differences in splat formation on aluminum and stainless steel surfaces corresponded to the variations of thickness and proportions of the oxide/oxyhydroxide layer on the surfaces A threedimensional numerical model was developed to simulate the impact of a droplet onto the substrate The simulation illustrated good agreement with experimental observations The effect of the oxide layer on the splat morphology was also examined It was suggested that the splat morphology was more strongly influenced by water release from the dehydration of oxyhydroxide to oxide rather than by simple presence of the oxide layer on the substrate surface
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