激光熔覆原位制备TiC/TiB复合陶瓷涂层的工艺参数优化  

Process Parameters Optimization of TiC/TiB Composite Ceramic Coatings In-situ Fabricated by Laser Cladding

作　　者：李文鹏 陈涛[1,2] 刘德福 LI Wenpeng;CHEN Tao;LIU Defu(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Changsha 410083,China)

机构地区：[1]中南大学机电工程学院,湖南长沙410083 [2]高性能复杂制造国家重点实验室,湖南长沙410083

出　　处：《热加工工艺》2021年第8期92-96,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51775559);高性能复杂制造国家重点实验室基金项目(ZZYJKT2019-06)。

摘　　要：通过激光熔覆技术,以Ti+B4C为原始粉末,在钛合金表面原位制备了TiC/TiB复合陶瓷涂层。基于响应面法,建立了激光熔覆工艺参数与陶瓷涂层几何特征和显微硬度之间的数学模型,研究了激光功率、扫描速度和光斑直径对涂层厚度、高度差和显微硬度的影响规律。结果表明,涂层的高度差随光斑直径增加而增大;显微硬度随激光功率增加而提高;激光工艺参数对涂层厚度没有显著影响。对激光工艺参数进行优化,得到了一组较优的工艺参数:激光功率P=400 W、扫描速度V=7 mm/s、光斑直径D=1 mm。TiC/TiB composite ceramic coatings on the surface of Ti6Al4V alloy were in-situ fabricated using Ti+B4C mixed powders as precursor materials by laser cladding.The mathematical model between laser cladding process parameters and geometrical characteristic or micro-hardness of the ceramic coatings were established in response surface methodology.The effects of laser power,scanning speed and spot diameter on the thickness,height difference and microhardness of the coatings were explored.The results show that the height difference of the coating increases with the increase of spot diameter.The microhardness of the coatings improves with the increase of laser power.However,the process parameters have no significant effects on the thickness of coatings.Through the optimal selection of the laser process parameters,a set of better process parameters are obtained as follows:laser power is 400 W,scanning speed is 7 mm/s and spot diameter is 1 mm.

关 键 词：激光熔覆 工艺参数优化 响应面法 TiC/TiB复合陶瓷涂层 

分 类 号：TG[金属学及工艺]