TiC含量对激光熔覆制备TiC/Ti基复合涂层组织与性能的影响  

Effect of TiC Content on Microstructures and Properties of Laser Cladding TiC/Ti Based Composite Coatings

作　　者：杨胶溪[1] 余兴 王艳芳 贾无名 陈虹[1] 王喜兵[1] YANG Jiaoxi;YU Xing;WANG Yanfang;JIA Wuming;CHEN Hong;WANG Xibing(Institute of Laser Engineering, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学激光工程研究院,北京100124

出　　处：《航空材料学报》2018年第3期65-71,共7页Journal of Aeronautical Materials

基　　金：研究生创新平台建设(101000543214524)

摘　　要：为提高钛合金的耐蚀性能和承载性能,采用半导体激光器在钛合金表面制备冶金质量良好的TiC/Ti基复合涂层,研究Ni包TiC+TC4混合粉末中TiC含量对TiC/Ti基复合层组织及性能的影响。使用扫描电子显微镜(SEM)和X射线衍射(XRD)对熔覆层进行组织形貌、物相表征,并对熔覆层的显微硬度、耐蚀性能及承载性能进行研究。结果表明:熔覆层物相主要由TiC,TiC0.95,NiTi_2,α'-Ti组成;熔覆层整体硬度波动较大,硬质相硬度为1000~1500HV,热影响区硬度约为437HV;Ni包TiC≤60%(质量分数,下同)时,熔覆层耐蚀性随着TiC质量分数的增加而增强,60%TiC时的耐蚀性能最优;Ni包TiC≤50%时,熔覆层承载性能随TiC质量分数的增加而提高,50%TiC时承载性能最优。To improve the corrosion resistance and load-bearing performance of titanium alloy, the TiC/Ti based composite coating with good metallurgical quality was prepared on the surface of TC4 titanium alloy by using Diode laser, and the effect of TiC content on the microstructures and properties of TiC/TC4 cladding was studied. The microstructure and phase constitution of the coating were characterized by scanning electron microscope （SEM） and X-ray diffraction （XRD）, the micro-hardness, corrosion resistance and the load-bearing performance of the coatings were evaluated. The results show that the cladding consists of TiC, TiC0.95, NiTi2 and α＇-Ti, and the overall hardness of the coating fluctuates greatly. The micro-hardness in hard phases and in the heat affected zone are 1000-1500HV and about 437HV respectively. While the mass fraction of Ni coated TiC is not higher than 60%, higher corrosion resistance of claddings can be obtained with the increase of the mass fraction of Ni coated TiC, reaching a maximum at 60%; while the mass fraction of Ni coated TiC is not higher than 50%, the load-bearing capacity of claddings can be improved with the increase of the mass fraction of TiC, reaching a maximum at 50%.

关 键 词：激光熔覆 TiC熔覆层 显微组织 腐蚀性能 承载性能 

分 类 号：TG17[金属学及工艺—金属表面处理]