不同烧结温度下超细合金烧结体的密度、钴磁和晶粒度

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。

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

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.