超音速火焰喷涂88WC-12Co涂层的抗氧化性能

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Abstract A high density 88WC-12Co coating was prepared on the surface of 45^# steel by high velocity oxy-fuel (HVOF). The microstructures, phases, and micro-hardness of the coatings after spraying and oxidation were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and micro-hardness tester respectively. The oxidation mechanism of the coating material was also discussed. The results show that 88WC-12Co coating has excellent oxidation resistance under 500 ℃, and the micro-hardness of the coating changes little after oxidation. However, the WO₃ and CoWO₄ phases significantly increased above 500 ℃, and the oxidation resistance and micro-hardness of the coating decreased obviously. The oxidation mechanism of the coating materials is that WC, W₂C and Co in the coating react with O₂ in the air to form WO₃ and CoWO₄under high temperature.

Key words： HVOF WC-Co coating micro-hardness anti-oxidation property

Received: 12 September 2017 Published: 12 July 2019

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TG174.442

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	Articles by authors
	LIU Baogang
	MA Qilin
	LIU Chao
	PENG Xinke
	ZHU Xiaoyun
	JI Qing

Cite this article:

LIU Baogang,MA Qilin,LIU Chao, et al. Anti-oxidation property of 88WC-12Co coating prepared by high velocity oxy-fuel spraying[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(4): 422-426.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I4/422

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