Performances of NiCr-Cr₃C₂ coating deposited by laser hybrid plasma spraying technology

The NiCr-Cr₃C₂ coating is deposited on the 38CrMoAl substrate by the LHPS(laser hybrid plasma spraying) technology,and the bonding strength,microhardness,microstructures and anti-high-temperature abrasion performance of the coating are tested and analyzed.The test results show that the LHPS NiCr-Cr₃C₂ coating achieves metallurgy bonding and has higher bonding strength than the plasma spraying coating.The laser power makes the NiCr-Cr₃C₂ powders melt more sufficiently and have good fluidity and uniformity.The LHPS NiCr-Cr₃C₂ coating has higher microhardness for its microstructure becomes thin and compact and there are no big cracks and cavities in it.For the changes of its microstructures and the improvements of its basic properties,the LHPS NiCr-Cr₃C₂ coating has more excellent anti-high-temperature abrasion performance and its friction coefficient is low and stable.