放电等离子烧结无黏结相Ti(C,N)基金属陶瓷的组织与性能

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Abstract The binderless Ti(C,N)-based cermets were fabricated by spark plasma sintering using Ti(C,N) powder as raw materials. The microstructure, mechanical properties, wear resistance of the materials were studied. Effects of sintering temperature, carbon black addition, carbides additives and solid solution raw powders on the relative density and mechanical properties were investigated. Furthermore, the (Ti,W,Mo,Ta) (C,N) solid solution powder fabricated by the dissolving of other alloying elements in the lattice of Ti(C,N) was also used to prepare the binderless cermets. The experimental results show that the relative density and mechanical properties of binderless cermets increase with increasing sintering temperature. With increasing carbon black content, the relative density and mechanical properties increase firstly and then decrease. After adding WC, Mo₂C and TaC carbides into Ti(C,N) powder, or using (Ti,W,Mo,Ta) (C,N) solid solution powder as raw materials, the oxygen content of Ti(C,N)-based cermets with bindeless phase is obviously reduced. The density and mechanical properties of the materials are greatly improved, and the friction coefficient and wear resistance of the materials are lower. The binderless Ti(C,N)-based cermet prepared by (Ti,W,Mo,Ta) (C,N) solid solution powders exhibits hardness (HV₃₀) of 19.9 GPa, transverse rupture strength of 1 030 MPa and fracture toughness of 7.8 MPa·m^1/2.

Key words： binderless Ti(C,N)-based cermets sintering temperature carbon content mechanical properties friction and wear

Received: 15 September 2020 Published: 18 January 2021

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	LU Saijun
	KANG Xiyue
	ZHANG Meimei
	HE Yuehui

Cite this article:

LU Saijun,KANG Xiyue,ZHANG Meimei, et al. Microstructure and properties of bindeless Ti(C,N)-based cermets prepared by spark plasma sintering[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 486-496.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I6/486

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