(1. 沈阳工业大学 材料科学与工程学院， 沈阳 110023；
2. 中国科学院金属研究所 金属腐蚀与防护国家重点实验室， 沈阳 110016；
3. 香港理工大学, 香港, 九龙)
摘 要: 利用Cr3C2和TiC生成自由能和稳定性的差异，通过激光熔化法在Ti6Al4V表面制备TiC颗粒增强钛基复合材料涂层。结果表明：选择合适的激光处理工艺，可使Cr3C2和Ti合金粉末通过原位结晶置换反应生成TiC/Ti复合材料熔覆层；亚微米级的TiC颗粒均匀地分布于复合材料的基体中，复合材料的基体组织随合金粉末的成分不同而改变。
关键字: 钛合金； 激光熔覆； 复合材料涂层； 原位自生
Ti-based composite coating induced by laser melting
（1. School of Materials Science and Engineering, Shenyang Polytechnic
University，Shenyang 110023, P.R.China;
2. State Key Lab for Corrosion and Protection， Institute of Metals Research，
The Chinese Academy of Sciences， Shenyang 110016， P.R.China;
3. The Hong Kong Polytechnic University, Hong Kong， Kowlong）
Abstract:A new Ti-based composite coating reinforced with fine and dispersive TiC particles was prepared on Ti-alloy of Ti6Al4V by laser induced reaction of Cr3C2 and Ti with respecting the large difference of the thermal stability between Cr3C2 and TiC. The results show that laser induced melting is helpful for the formation of this kind of composite coating provided a suitable sets of processing parameters and the ratio of Cr3C2 to Ti are selected. The in-situ replacing reaction of Cr3C2 with Ti does surely produce a TiC/Ti composite layer containing fairy uniformly distributed fine TiC particles of sub-micrometers and with good bonding to the substrate. The microstructure of the coating can easy be controlled by varying the chemical composition of the powder mixtures pre-placed and also the processing parameters.
Key words: titanium alloy; laser cladding; composite coatings; in-situ synthesis
