张钱伟,廖军,叶潇潇,叶红云,张玉琪,董凯林

• 1:自贡硬质合金有限责任公司

摘要(Abstract)：

针对超细晶WC-Co硬质合金的制备，WC晶粒生长抑制剂的运用尤为重要。本研究采用粉末冶金方法制备了超细WC-9%Co硬质合金，研究了Cr_3C_2和VC复合抑制剂对超细WC-9%Co硬质合金制备、微结构及性能的影响。结果表明：随着复合抑制剂中VC的增加，即Cr_3C_2的减少，合金的晶粒尺寸、断裂韧性逐渐降低，矫顽磁力、钴磁逐渐升高，横向断裂强度则先增高后降低；同时，随着VC配比的增加到一定程度合金逐渐出现VC偏析现象。综合来看，WC-9%Co-0.5%Cr_3C_2-0.5%VC超细硬质合金表现出较优的综合物理性能（矫顽磁力38.9 kA/m、钴磁7.82%、密度14.44 cm~3/g）、力学性能（洛氏硬度94.0 HRA、维氏硬度2 010 HV30、横向断裂强度4 691 MPa）。

关键词(KeyWords)： 超细晶硬质合金;晶粒生长抑制剂;显微结构;物理性能;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 张钱伟,廖军,叶潇潇,叶红云,张玉琪,董凯林

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