Properties of Laser Melted MCrAlY Coatings on Cu Alloy Substrates Available to Purchase

This study assesses the effect of laser melting on MCrAlY-coated copper substrates. CoNiCrAlY, NiCoCrAlY, and NiCrAlY powders were applied to copper alloy substrates by atmospheric plasma and HVOF spraying. Sample surfaces were then laser melted and coating properties were determined and correlated with coating composition, surface morphology, and cross-sectional microstructure. Laser melting not only caused the coatings to fuse to the substrate, but also precipitated the formation of an aluminum oxide surface layer that reduced the oxygen content in the coating. As a result of this finding, the coating samples were heat treated in order to measure their high-temperature oxidation resistance.