Ti(C,N)含量和烧结温度对梯度硬质合金脱β层厚度的影响

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Abstract WC-TiC-Ti(C,N)-TaC-NbC-Co cemented carbide was prepared in denitrification atmosphere with Ti(C,N) as N source. The effects of Ti(C,N) content and sintering temperature on the thickness of β-free layer, properties and microstructure of the cemented carbides were investigated. The results show that the thickness of β-free layer increases with increasing mass fraction of Ti(C,N) from 0.5% to 1.5%. With the increase of sintering temperature, the thickness of β-free layer increases, and the increment increases with increasing Ti(C,N) content. The density, hardness and coercivity of the alloy are not affected by Ti(C,N) content. However, with the increase of sintering temperature, the hardness decreases, the coercivity decreases, and the average grain size of WC increases and becomes straight. There is no obvious abnormal growth of WC grains in the β-free layer, and the thickness of β-free layer is determined by the diffusion of Ti and the content of N.

Key words： cemented carbides β-free layer Ti(C,N) content sintering temperature gradient

Received: 06 November 2020 Published: 22 March 2021

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	CHENG Dengfeng
	SUN Dongping
	LIU Nana

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CHENG Dengfeng,SUN Dongping,LIU Nana. Effects of Ti(C,N) content and sintering temperature on the thickness of β-free layer of graded cemented carbides[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(1): 47-54.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I1/47

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