Effect of Y_2O_3 Content on Microstructure of Gradient Bioceramic Composite Coating Produced by Wide-Band Laser Cladding

摘要

To eliminate thermal stress and cracks in the process of laser cladding, a kind of bioceramic coating with gradient compositional design was prepared on the surface of Ti alloy by using wide-band laser cladding. And effect of Y203 content on gradient bioceramic composite coating was studied. The experimental results indicate that adding rare earth can refine grain. Different rare earth contents affect formation of HA and (3-TCP in bioceramic coating. When the content of rare earth ranges from 0.4 percent to 0.6 percent , the active extent of rare earth in synthesizing HA and (3-TCP is the best, which indicates that "monosodium glutamate" effect of rare earth plays a dominant role. However, when rare earth content is up to 0.8 percent , the "amount of synthesizing HA and (3-TCP in coating conversely goes down, which demonstrates that rare earth gradually losts its catalysis in manufacturing HA and (3-TCP.