(1. 南京航空航天大学大学 直升机传动技术重点实验室, 南京，210016；
2. 哈尔滨工业大学先进焊接与连接国家重点实验室, 哈尔滨, 150001)
摘 要: 金刚石颗粒表面镀膜和热处理可解决高导热金刚石/铜复合材料的界面润湿和结合问题，本文研究了金刚石颗粒表面磁控溅射镀覆改性金属 Mo 和 W以及不同热处理工艺对镀覆金刚石颗粒重量、表面形貌、微观组织和组成的影响规律。研究结果发现，磁控溅射后Mo镀层呈现麦粒状组织，而W镀层为球形状组织；在真空环境下热处理，随着热处理温度的增加会加速Mo或者W的升华速率，使得金刚石颗粒表面裸漏在热处理环境中而发生石墨化。在Ar环境下热处理，900 ℃时Mo或者W单质相还有残留，当温度升高到950 ℃时出现了石墨化现象，但热处理温度为1000 ℃时形成了致密的MoCx和WCx相，消除了石墨化现象，并获得了良好的热处理界面，为获得高导热性的金刚石/铜复合材料奠定基础。
关键字: 金刚石/铜复合材料；热处理工艺；微观组织；金刚石石墨化；相组成
（1. National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China）
Abstract:The surface coating and heat treatment of diamond particles can solve the problem of high performance interface wetting and combination of high thermal conductivity diamond/copper composites. In this paper, the effects of magnetron sputtering surface coating modified metals Mo and W and different heat treatment processes on the weight, surface morphology, microstructure and composition of coated diamond particles are studied. The results show that Mo coating presents wheat grain structure after magnetron sputtering, while W coating has spherical structure; In vacuum environment, with the increase of heat treatment temperature, the sublimation rate of Mo or W will be accelerated, and graphitization will occur on the surface of diamond particles when exposed to the environment of heat treatment. After heat treatment in Ar environment, at 900 ℃ Mo or W phase still remains, and graphitization occurs when the temperature rises to 950 ℃. However, dense MoCx and WCx phases are formed when the heat treatment temperature is 1000 ℃. The graphitization phenomenon is eliminated and a good heat treatment interface is obtained, which lays a foundation for obtaining diamond copper composites with good thermal conductivity.
Key words: Diamond/ copper composites；Heat treatment process；Microstructure；Diamond graphite；Phase composition
