Preparation and Performance Analysis of Al2O3 Added NiCrAl Coating by Laser Deposition
NiCrAlY+10% Al2O3,100%NiCrAlY,and NiCrAlY+20% Al2O3 samples were prepared by laser deposition.XRD and SEM characterization were performed on each sample,and the phase composition and microstructure morphology of each sample were analyzed.At the same time,the microhardness of each coating surface was tested using a microhardness tester.The research results showed that after adding Al2O3 to NiCrAlY,many spherical Al2O3 particles with a size of less than 2 μm were formed at the grain and grain boundaries,forming primary dendrite arms with smaller spacing in the coating.At the same time,a lower proportion of Ni-Y phase was formed,and dispersed Y2O3 ceramic particles were formed in the matrix structure.As the amount of Al2O3 added increased,the coating hardness significantly increased.This study contributes to improving the quality of laser additive manufacturing and lays a theoretical foundation for subsequent process parameter optimization.