Ni-Al Intermetallic Compound Coating on 304 Austenitic Stainless SteelUsing Combustion Synthesis

摘要

Ni-Al intermetallic compounds were coated onto AISI304 substraternsurfaces using combustion synthesis. This paper examines the phasernstructure, Vickers hardness, and oxidation resistance of the coatingrnlayers. Ni-Al intermetallic compounds were confirmed to form for allrnof the specimens tested. With the highest composition tested, Ni-rn75at%Al, a diffusion layer from the bonding interface into the substrate was observed. The coating layer comprised multi-phases with a uniform distribution of fine pores resulting in a scatter of micro-rnVickers hardness throughout the coating layer. A nearly single phaserncoating layer was obtained after heat treatment. The heat-treated layer was thus confirmed to exhibit further improvement in oxidationrnresistance than the coated layer before heat treatment.