不同烧结温度下超细合金烧结体的密度、钴磁和晶粒度  

Research on Density, Cobalt Magnetism and Grain Size of Ultrafine Cemented Carbide Sintered at Different Temperatures

作　　者：饶承毅[1,2] 

机构地区：[1]硬质合金国家重点实验室,湖南株洲412000 [2]株洲硬质合金集团有限公司,湖南株洲412000

出　　处：《硬质合金》2011年第3期143-147,共5页Cemented Carbides

摘　　要：本文研究了钴质量分数为10.5%的超细硬质合金在不同的烧结温度下的致密度、钴磁、晶粒长大等方面的变化趋势。研究结果表明:含量为10.5%的超细硬质合金,当烧结温度达到1 350℃时合金已基本致密化;在经典的WC-Co伪二元状态图表明的固相烧结阶段,随着温度升高,钴磁降低,晶粒长大以并合方式为主,可能存在少许的溶解-析出现象;在液相烧结阶段,钴磁达到稳定值后基本不变,晶粒长大以溶解-析出为主。The influences of sintering temperature on the properties of the ultrafine cemented carbide with cobalt content of 10.5% were researched on the variation trends of density,cobalt magnetism and grain growth.The results show that the ultrafine cemented carbide with cobalt content of 10.5% is fully densified when sintering temperature reaches 1 350 ℃.In the solid phase sintering stage indicated in the pseudobinary WC-Co constitutional diagram,the cobalt mag-netism increases with the increasing of sintering temperature,the way of grain growth is mainly amalgamation,a small quantity of dissolution-precipitation maybe exist.But in the liquid phase sintering stage,the cobalt magnetism is basically invariable,the way of grain growth is mainly dissolution-precipitation.

关 键 词：超细硬质合金 烧结温度 致密度 钴磁 晶粒长大 

分 类 号：TF124.5[冶金工程—粉末冶金]