Abstract
NiCrAlY/NiAl multi-layered coating was produced on SUS310S steel by means of mutual low pressure plasma spraying of NiCrAlY and Al powders which was accompanied with self propagating high-temperature synthesis (SHS) reaction of metal deposits. The NiAl layer contained Ni3Al particles and Cr2Al phase along the fine grain boundary. Also, Ni3Al was detected in the NiCrAlY layer with a small amount of NiAl particles. As the result, high hardness was obtained in both the layers, i.e., 650HV in NiAl layer and 450HV in NiCrAlY one at 673K. The structure of the multilayered coating changed hardly during annealing lower than 973K because enriched Cr at NiCrAlY/NiAl interface suppressed NiAl+Ni3Al→Ni5Al3 peritectoid reaction. The SHS reaction time of an compressed Al droplet in diameter of 50μm was calculated as 4.17×10-3 second.
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