摘要
以 Ｔｉ， Ｃｒ３Ｃ２混合粉末作为预置合金涂层，采用 ＹＡＧ固体激光器进行激光熔覆处理，在 Ｔｉ６Ａ１４Ｖ合金表面制备出原位自生ＴｉＣ颗粒增强钛基复合材料涂层．实验结果表明，采用合适的合金粉末成分和激光辐照能量密度，可以获得增强相ＴｉＣ弥散分布的钛基复合材料熔覆层，熔覆层结晶致密，且与复合材料基体润湿性良好，熔覆层中复合材料的基体组织随预置合金粉末成分的改变而变化．摩擦磨损实验结果表明，原位自生ＴｉＣ／Ｔｉ复合材料熔覆层可明显改善Ｔｉ６Ａｌ４Ｖ合金的表面硬度和摩擦磨损性能．
By means of laser induced surface melting process an in situ formed TiC particle reinforcement composite coating was successfully synthesized on Ti based alloy Ti6Al4V with preplaced powder mixtures of Ti and Cr3C2. It was revealed that with a proper ratio of Ti to Cr3C2 and power density of the pulse laser beam, a composite coating consisted of TiC particles dispersed in β-Ti matrix can be obtained. The coating has good metallurgical bonding with the substrate as well as there is a good wettability between the reinforcement TiC and the coating matrix. The microstructure and the phase distribution in the composite coating varied with changes of the chemical composition of the powder mixture and the laser processing parameters. The results of wearing test showed that the composite coating enhanced greatly the surface hardness and the wearing resistance of the alloy Ti6Al4V.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第3期315-320,共6页
Acta Metallurgica Sinica
基金
中国科学院院长基金资项目
