TiN添加量对WC-TiC-TaC-8.0Co硬质合金组织与性能的影响

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Abstract Using TiN as N source, WC-TiC-TaC-8.0Co cemented carbide with β-Delamination gradient was prepared by one-step sintering with traditional powder metallurgy method. The microstructure of the alloy was observed and analyzed by means of scanning electron microscope, the effect of TiN addition on the microstructure, the thickness of β-layer, physical and mechanical properties was studied, and cutting test was also carried out. The results show that the density, coercive force, hardness and other physical properties of the alloy have no obvious variation with the increase of TiN content (mass fraction, the same below) in the range of 0-2.0%, but the thickness of β-layer obviously increases. With increasing TiN content from 0.5% to 2.0%, the corresponding thickness of cubic carbide free layer increases from 0 to 32.7 μm. The cutting test results show that the TiN content of 1.0%, cemented carbides has the excellent comprehensive properties of wear resistance and impact resistance after coating.

Key words： cemented carbides cubic carbide free layer TiN content microstructure property

Received: 06 September 2019 Published: 19 June 2020

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	WANG Yanjie
	LIU Yong
	YANG Xinyu

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WANG Yanjie,LIU Yong,YANG Xinyu. Effect of TiN content on microstructure and properties of WC-TiC-TaC-8%Co cemented carbide[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 35-39.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I1/35

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