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周向葵,王凯,许智峰,王小彬,王强,赫冀成.立方相对超细晶梯度硬质合金微观组织的影响[J].稀有金属材料与工程(英文),2017,46(12):3903~3909.[Zhou Xiangkui,Wang Kai,Xu Zhifeng,Wang Xiaobin,Wang Qiang,He Jicheng.Effect of cubic phase on microstructure of ultrafine crystalline gradient cemented carbide[J].Rare Metal Materials and Engineering,2017,46(12):3903~3909.]
Effect of cubic phase on microstructure of ultrafine crystalline gradient cemented carbide
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Received:October 30, 2015  Revised:July 18, 2016
DOI:
Key words: Gradient cemented carbides  Ultrafine crystalline  Cubic phase  Sintering  Microstructure
Foundation item:科技部重大专项(项目号2012ZX04003061)
Author NameAffiliationE-mail
Zhou Xiangkui Northeastern University neuepm@163.com 
Wang Kai Northeastern University wangkai@epm.neu.edu.cn 
Xu Zhifeng Northeastern University  
Wang Xiaobin Northeastern University  
Wang Qiang Northeastern University  
He Jicheng Northeastern University  
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Abstract:
      Ultrafine WC powder was chosed and ultrafine crystalline gradient cemented carbides was prepared by a two-step sintering process, where the cemented carbides is first lower pressure pre-sintered and then subjected to a gradient sintering. The influences of cubic phase on microstructure and property of ultrafine crystalline gradient cemented carbides have been studied. The results show that the thicker gradient layer can be form in alloy with only adding Ti(C,N), but the mean WC grains size has a large value after gradient sintering. The thinner gradient layer has been formed when (W,Ti)C or (Nb,Ta)C was added, but the mean WC grains size is smaller than the alloy with only adding Ti(C,N). Some WC grains with size above 1 μm has been formed in the alloy with adding (W,Ti)C after gradient sintering. The formation of the core-rim structure cubic phase can be prevent by adding (Ta,Nb)C.