钴粉形貌和粒度对低钴超细硬质合金性能的影响  

EFFECT OF COBALT POWDER MORPHOLOGY AND GRAIN SIZE ON LOW COBALT SUPERFINE HARD-METALS' PROPERTIES

作　　者：汪中玮[1] 张卫兵[1] 何惧[1] 

机构地区：[1]株洲硬质合金集团有限公司,湖南株洲412000

出　　处：《粉末冶金工业》2008年第1期14-18,共5页Powder Metallurgy Industry

基　　金：国家"863"高技术资助项目(2002AA331090)

摘　　要：用不同形貌和粒度的钴粉作为粘结相在相同的条件和成分下制成低钴含量6%(质量分数)的超细硬质合金,通过扫描电镜(SEM)的二次电子(SEI)和背散射(BEI)分析法以及能谱(EDS)成分分析法等对混合料的微观结构、微区成分进行分析,并就混合料的压制压力、合金的微观结构和物理性能等进行了对比。试验结果表明:在相同的生产工艺条件下,用类球形钴粉来生产低钴超细硬质合金可以使混合料的湿磨时间缩短10h左右,且合金微观结构更均匀,合金的抗弯强度提高,合金的硬度变化不明显,粉末的压制压力有所增大。The low cobalt（6wt%）hard-metal was prepared with same composition and conditions, but with different cobalt powder＇s morphology and grainsize as the binder,and the microstructure,micro-zone components of the mixtures and the pressing force microstructure and properties of the parts were stadied by the SEI,BEI of SEM and the EDS analysis. The results indicate the low cobalt superfine hard-metals of better microstructure and higher fracture strength, without obvious effect on hardness can be produced with reduced milling time by 10 hours and hiher pressing force from globular cobalt powder.

关 键 词：钴粉形貌 超细硬质合金 性能 微观结构 

分 类 号：TF125.3[冶金工程—粉末冶金]