低压烧结温度对一步法制备超细晶WC-Co基硬质合金组织及性能的影响

doi:10.11896/j.issn.1005-023X.2017.016.014

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Abstract W-C-10Co-0.9VC-0.3Cr₃C₂nano composite powders were prepared by plasma milling (P-milling), and subsequently compressed into green compacts with a uniaxial pressure, then the green compacts were carbonized and sintered in a one-step me-thod by low pressure sintering technology. The analysis results indicate that the homogeneous and lamellar structure composite powder is achieved by P-milling for 3 h. Due to the special effect of P-milling, VC and Cr₃C₂ begin to play a role of inhibition to WC grain size at the temperature of 1 380 ℃ and 1 400 ℃. Among them, the hard metals that sintered at 1 380 ℃ exhibit the optimum combination of WC grain size and relative density, and the best mechanical performance simultaneously. The density of hard metal is 99.2% with 250 nm of mean WC grain size, and the hardness and transverse rupture strength reach up to 92.3HRA and 2 443 MPa, respectively.

Key words： plasma milling carbonizing and sintering by one-step low pressure sintering sintering temperature mechanical performance

Published: 07 May 2018

CLC number:

TF125

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	Articles by authors
	BAO Xianyong
	ZHANG Feng
	LU Zhongchen
	ZENG Meiqin
	ZHU Min

Cite this article:

BAO Xianyong,ZHANG Feng,LU Zhongchen, et al. Effect of Low Pressure Sintering Temperature on Microstructure and Mechanical Performance of Ultrafine WC-Co Based Hard Metals Prepared by One-step Method[J]. Materials Reports, 2017, 31(16): 65-71.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.016.014 OR http://www.mater-rep.com/EN/Y2017/V31/I16/65

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