微观结构对纳米金刚石涂层WC-Co结合性能的影响

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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%CH₄concentration 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.

Key words： diamond structure nanocrystalline diamond hot filament chemical vapor deposition grain size nucleation density film adhesion strength

Received: 26 February 2019 Published: 12 July 2019

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	Articles by authors
	DENG Biao
	ZHOU Kechao
	XIAO He
	WEI Qiuping
	MA Li
	YI Mingkun
	LUO Yijie
	LI Liang

Cite this article:

DENG Biao,ZHOU Kechao,XIAO He, et al. Effect of diamond structure on the adhesion of the nanoscale diamond film coated to WC-Co cemented carbide[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 358-364.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I4/358

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