纳米SiC对Ti(C,N)基金属陶瓷微观组织与性能的影响

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Abstract Ti(C,N), WC, Mo₂C, TaC and Cr₂C₃powders were used as the main raw materials, Co and Ni powders were used as binders, and nano-SiC powders with 0-11% volume fraction were added as the reinforcing phase to prepare Ti- (C,N) based cermets. The effect of SiC content on the microstructure, mechanical properties and high temperature oxidation resistance of ceramic materials was studied. The results indicated that a small amount of SiC could not change the original phase structure of the cermet. As SiC content increased, the integrity of the ring phase decreased and the average grain size of the hard phase reduced. Ti(C,N)-based cermet with 5% volume fraction SiC had excellent comprehensive properties, with Rockwell hardness of 88.8 HRA, flexural strength of 2 280 MPa, and fracture toughness of 13.22×10³ kN∙m^-3/2. The addition of SiC enhanced the high temperature oxidation resistance of Ti(C,N) based cermets and produced a dense SiO₂ film on the surface.

Key words： Ti(C,N)-based cermets nano-SiC microstructure mechanical properties high temperature oxidation resistance

Received: 13 May 2020 Published: 18 September 2020

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	GONG Difan
	LI Yongxia
	YANG Hailin
	ZOU Dan
	LIU Yanjun

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GONG Difan,LI Yongxia,YANG Hailin, et al. Nano-SiC addition on microstructure, mechanical properties and high temperature oxidation resistance of Ti(C,N)-based cermets[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(4): 321-329.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I4/321

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