激光熔覆Ti/C混合粉末原位生成TiC的研究  

Insitu Formation of TiC by Laser Cladding Ti/C Coatings

作　　者：杨玉玲[1] 张多[1] 陈浩[1] 郭卿超[1] 尚野[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110004

出　　处：《应用激光》2008年第1期6-8,共3页Applied Laser

基　　金：辽宁省博士启动基金资助项目(项目编号:20051012);东北大学博士后基金资助项目

摘　　要：为改善钛合金表面性能,采用一定比例的Ti/C混合粉末作为预涂层,500WYAG脉冲激光作为辐射源,利用激光熔覆方法对Ti-6Al-4V钛合金表面进行激光熔覆处理,在钛合金表面原位生成了以TiC陶瓷为主的陶瓷层。利用XRD、OM、以及显微硬度测试等手段对熔覆层的成份、组织及性能进行了分析测试。实验结果表明,原位生成TiC陶瓷的合适工艺参数组合为:脉宽0.5ms,脉冲频率15Hz;扫描速度为1.0mm/s左右;Ti:C=4:1(质量比)。在此工艺条件下,熔覆层中可原位生成以TiC为主,同时含有粘结相Ti的陶瓷金属熔覆层,熔覆层内组织比较均匀,没有裂纹和气孔,熔覆层与基底形成了良好的冶金结合。熔覆层的显微硬度最高可达到1546kg/mm2左右,比基底硬度(310kg/mm2)提高了近4倍。Laser cladding technique was realized on the surface of Ti-6Al-4V alloy, in which Ti/C compounds with a certain ratio was used as the pre-pasted coatings, and YAG laser with the power of 500W was utilized as radiation source. The phase components, the structure and the microhardness of cladded layer were investigated by XRD, OM and microhardness test respectively. The results show that the appropriate parameters for the insitu formation of TiC ceramic are that laser frequency 15 Hz, pulse width 0.5ms, laser velocity about 1.0mm/s, and the mass ratio of Ti and C （Ti： C） 4 ： 1. TiC ceramic with the thickness of 0.2mm was insitu formed with the above parameters. The structure in cladded zone is tiny dentrites; there are no cracks and air bubble in it. The metallurgical combination is realized between the cladded zone and the substrate. The microhardness HV0.2 in cladded zone is about HV1546, which is about 5 times of that of the substrate （HV310）.

关 键 词：激光熔覆 TiC熔覆层 X射线衍射 显微硬度 钛合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]