VC添加量对纳米晶硬质合金的制备及性能影响  

Effect of VC Addition on Preparation and Mechanical Properties of Nanocrystalline WC-Co Alloys

作　　者：刘雪梅[1] 王海滨[1] 宋晓艳[1] 王西龙[1] 李玉玺 

机构地区：[1]北京工业大学,北京100124 [2]自贡长城硬面材料有限公司,四川自贡643000

出　　处：《稀有金属材料与工程》2016年第2期477-481,共5页Rare Metal Materials and Engineering

基　　金："973"计划研究专项(2011CB612207);"863"计划主题项目(SQ2013AAJY3168);国家自然科学基金(51174009);北京市自然科学基金(2133062)

摘　　要：以钨钴氧化物、炭黑和VC为原料,采用原位还原碳化法制备WC-Co复合粉末,将复合粉末进行放电等离子烧结致密化制备WC-Co硬质合金块体材料。研究了不同VC添加量的复合粉末和块体材料的相组成、显微组织和性能,结果表明:VC的添加量对复合粉末的相组成、合金的晶粒尺寸和性能具有重要的影响,原料中添加2.0%VC(质量分数)时可获得平均晶粒尺寸为101 nm,相组成仅为WC和Co且具有高硬度和良好韧性的硬质合金块体材料。WC-Co composite powder was synthesized with carbon black and W, Co oxides as raw materials and VC as additive by the in-situ reduction and carbonization process. The nanocrystalline WC-Co alloys were fabricated by the spark plasma sintering technique using the prepared WC-Co composite powder. The phase composition, microstructure characteristics and mechanical properties of the sintered cemented carbides were analyzed. The results show that VC addition plays a significant role in phase composition, grain size and properties of the prepared WC-Co alloy. When the VC addition is 2.0%, the average grain size is 101 nm, the phases are WC and Co, and the cemented carbides possess high hardness and good fracture toughness.

关 键 词：WC-CO硬质合金 VC添加量 性能 

分 类 号：TG135.5[一般工业技术—材料科学与工程]