原料中C/N原子比对TiCN基金属陶瓷组织结构和性能的影响

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Abstract Three kinds of TiCN-25WC-10TaC-2Mo₂C-7Ni-7Co cermets were prepared from TiCN powders with different C/N ratio, i.e., Ti(C_0.4,N_0.6), Ti(C_0.5, N_0.5) and Ti(C_0.7,N_0.3). The effects of C/N atomic ratio on the microstructure, hardness, transverse rupture strength, Palmqvist toughness, magnetic properties and corrosion resistance of TiCN-based cermets were investigated. The observation and analysis results show that there is a M₆C type decarburization phase (η phase) in the cermet with Ti(C_0.4,N_0.6) as the raw material, which results in a substantially decrease in transverse rupture strength and toughness. Microstructure of the cermet prepared from Ti(C_0.7,N_0.3) raw material shows a typical weak core-rim structure, which is accompanied by the best mechanical properties, i.e., 15.61 GPa for HV30, 2 294 MPa for transverse rupture strength and 11.29 MN•m^-3/2 for Palmqvist toughness. With the decrease of C/N ratio in the TiCN raw material, the coercivity force and relative magnetic saturation of cermet decrease rapidly. The results of electrochemical corrosion experiments in H₂SO₄ solution with pH=1 show that the corrosion resistance of cermets prepared from Ti(C_0.4,N_0.6) and Ti(C_0.5,N_0.5) is similar, and the corrosion resistance of cermets prepared from Ti(C_0.7,N_0.3) is significantly decreased.

Key words： Ti(C,N)-based cermet C/N atomic ratio microstructure mechanical property magnetic property electrochemical corrosion

Received: 08 October 2019 Published: 19 June 2020

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	Articles by authors
	CUI Yanming
	ZHANG Li
	HUANG Long
	LIU Tao
	LIANG Yan
	WU Houping
	XIONG Xiangjun

Cite this article:

CUI Yanming,ZHANG Li,HUANG Long, et al. Effects of C/N atomic ratio in raw materials on the microstructure and properties of Ti(C,N)-based cermets[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(1): 58-64.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I1/58

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