Ti-6Al-4V表面电子束熔覆(Ti,W)C1-x复合涂层的形成及摩擦性能  

Formation and Friction Properties of Electron Beam Cladding(Ti,W)C1-x Composite Coatings on Ti-6Al-4V

作　　者：刘东雷[1] 陈情 王德 张睿[2] Yamaguchi Tomiko 王文琴[1,4] LIU Donglei;CHEN Qing;WANG De;ZHANG Rui;Tomiko Yamaguchi;WANG Wenqin(School of Mechanical and Electrical Engineering,Nanchang University,Nanchang 330031,China;School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China;Faculty of Engineering,Kyushu Institute of Technology,Kitakyushu 804-8550,Japan;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China)

机构地区：[1]南昌大学机电工程学院,南昌330031 [2]南昌航空大学航空制造工程学院,南昌330063 [3]Faculty of Engineering,Kyushu Institute of Technology,Kitakyushu 804-8550,Japan [4]清华大学摩擦学国家重点实验室,北京100084

出　　处：《金属学报》2020年第7期1025-1035,共11页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目No.51765041;摩擦学国家重点实验室摩擦学科学基金项目No.5KLTLF17B07。

摘　　要：通过高能电子束熔覆技术,利用WC-10Co粉末在Ti-6Al-4V (TC4)合金表面制备了(Ti, W)C1-x复合涂层。采用SEM、EPMA和XRD等手段对不同熔覆电流下复合涂层的显微组织和相组成进行了分析,讨论了各相的形成机理;采用显微硬度计和球盘摩擦实验设备对复合涂层的显微硬度和摩擦性能进行分析,讨论了不同熔覆电流下复合涂层的摩擦机理。结果表明,3种复合涂层中WC粉末均全部分解,涂层由α-Ti、β-Ti、树枝状和块状(Ti, W)C1-x及少量W组成。复合涂层厚度为400~600μm,涂层与基体结合性良好。与基体相比,(Ti, W)C1-x复合涂层的平均硬度和耐磨性提高2~3倍且随熔覆电流增加而降低,在熔覆电流为12 mA时,表面显微硬度最高为860 HV;熔覆电流为12和15 m A时摩擦机理分别为轻微磨粒磨损和严重的磨粒磨损,而18 mA时还伴随着少量疲劳磨损。The(Ti,W)C1-x composite coatings were prepared on the surface of Ti-6Al-4V(TC4)alloy by high energy electron beam cladding technology using WC-10Co powder.The microstructure and phase composition of the composite coatings under different cladding currents were analyzed by SEM,EPMA and XRD,and the formation mechanism of each phase was discussed in detail.The microhardness and friction property of the composite coatings were analyzed by microhardness tester and ball-disk friction test equipment,and the friction mechanism of the composite coatings under different cladding currents was discussed.The results show that the WC powders in the three composite coatings were completely dissolved.The coating consists ofα-Ti,β-Ti,dendritic and block(Ti,W)C1-x,and a small amount of W.The thickness of the coatings ranges from 400 to 600μm,and the adhesion between the coatings and the substrate was good.Compared with the substrate,the average hardness and wear resistance of the composite coatings increased by 2~3 times and decreased with the increase of cladding current.The surface microhardness was up to 860 HV at the cladding current of 12 mA.In addition,the friction mechanism was abrasive wear at 12 mA and it became severer at 15 mA;at the cladding current of 18 mA,a little fatigue wear was also proved.

关 键 词：电子束熔覆 金属基复合材料 钛合金 (Ti W)C1-x 

分 类 号：TG113[金属学及工艺—物理冶金]