激光熔覆稀土陶瓷涂层进展

Advance in Study on Laser Cladding Ceramic Coating

综述了激光熔覆稀土陶瓷涂层研究现状及其最新进展。介绍了激光熔覆工艺特点和影响因素,激光熔覆工艺包括粉末材料的加入方法和激光辐照加工。加入方法分预置法和同步送粉法,工艺参数包括光斑尺寸、扫描速度、熔覆道次、送粉量、涂层厚度和搭接量等。研究认为正确选择工艺参数是保证熔覆层质量和性能的关键。总结了稀土添加剂的强化作用机制,其主要作用为微合金化、净化晶界、细化晶粒、改善晶界状态、抑制柱状晶生长。对激光熔覆稀土陶瓷涂层研究的发展进行了展望。

Latest progress and research status of laser cladding ceramic coating was summarized. Technique characteristics and influence factors of laser cladding technique were introduced. Laser cladding technique includes the mixing method and laser irradiation. The mixing method can be classified as pre--coating method and synchronization method. The technique parameters include size of facula ,scanning speed,cladding sector and times ,adding quantity of powder,thickness of coating and quantity of joint coating. The results＇ show that proper technique parameters can be controlled in order to acquire high quality laser cladding coating. Strengthened effect mechanism of rare earth additive is concluded,the main effects of rare earth additive are micro-alloying, purifying grain boundary, fining crystal grains, improving grain boundary state, restraining columnar crystal growing. The development of laser cladding ceramic coating research was discussed.