Effect of diamond structure on the adhesion of the nanoscale diamond film coated to WC-Co cemented carbide
DENG Biao1, ZHOU Kechao1, XIAO He2, WEI Qiuping1, MA Li1, YI Mingkun1, LUO Yijie1, LI Liang1
1. State Key Laboratory of Power Metallurgy, Central South University, Changsha 410083, China; 2. Zhuzhou Cemented Carbide Group Corporation, Zhuzhou 412000, China
Abstract：Diamond structure has an important effect on the adhesion of diamond film coated cemented carbides. In this paper, the WC-Co substrate was pretreated by two-step method, and the hot-filament chemical vapor deposition (HFCVD) actor was used to fabricate nano-scale diamond films under the condition of 2%, 3% and 4%CH4 concentration in CH4/H2/Ar atmosphere, respectively. The surface morphology, section morphology and the sp3/sp2 phase of the films were analyzed by SEM and Raman, respectively. The adhesion properties of the films were evaluated by scratch test. The results show that increasing the concentration of methane can effectively refine the grain of the diamond, which is beneficial to obtain nanocrystalline diamond. As the the grain size of diamond decreases from hundreds of nanometers to tens of nanometers, the sp2 phase in the film and the nucleation density increases. The critical loads of diamond films deposited on each sample are 15.2, 6.9 and 9.1 N, respectively. Combined with the microstructure of the films, it can be concluded that the diamond film with high purity and high nucleation density contributes to the improvement of the adhesion of the nano-scale diamond film.
邓彪, 周科朝, 肖和, 魏秋平, 马莉, 易铭昆, 罗一杰, 李亮. 微观结构对纳米金刚石涂层WC-Co结合性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(4): 358-364.
DENG Biao, ZHOU Kechao, XIAO He, WEI Qiuping, MA Li, YI Mingkun, LUO Yijie, LI Liang. Effect of diamond structure on the adhesion of the nanoscale diamond film coated to WC-Co cemented carbide. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 358-364.
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2019, Vol. 24 
