赵志伟,郑红娟,刘颖,邹文俊,左宏森,关春龙

• 1:河南工业大学材料科学与工程学院
• 2:四川大学材料科学与工程学院

摘要(Abstract)：

采用纳米碳化钒(V8C7)粉末作为晶粒抑制剂及放电等离子烧结(SPS)方式制备超细WC基硬质合金。X射线衍射结果表明:超细WC基硬质合金主要由WC和Co3C两相组成,随着温度的升高,WC的衍射峰逐渐向小角度偏移。扫描电镜结果表明:SPS和纳米V8C7粉末对超细WC基硬质合金的微观组织具有重要影响。SPS使超细WC基硬质合金在较低温度下(1200℃)实现致密化;纳米V8C7粉末可以有效抑制超细WC基硬质合金中WC的晶粒长大,1200℃时WC的晶粒尺寸约500nm。力学性能结果表明:1200℃时超细WC基硬质合金具有较高的性能(相对密度99.5%,洛氏硬度93.2,断裂韧性12.5MPa·m1/2)。

关键词(KeyWords)： 硬质合金;放电等离子烧结;纳米碳化钒;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家“863”专题课题项目(2008AA031105);; 河南工业大学博士科研启动基金(2009BS014)

作者(Author): 赵志伟,郑红娟,刘颖,邹文俊,左宏森,关春龙

DOI: 10.13289/j.issn.1009-6264.2010.08.030

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