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采用混合稀土(以La和Ce为主体成分)-Co预合金粉形式在硬质合金湿磨时直接加入制备了含稀土的低碳硬质合金。用扫描电镜与能谱仪对合金的烧结体表面进行了观察与分析。结果表明,在真空烧结过程中,合金中的稀土La、Ce发生分离,Ce向合金表面迁移,并在合金烧结体表面产生了明显的富集,形成含氧的稀土第三相。本文从热力学方面对这一现象进行了解释。
Using rare earth rare earth (La and Ce as the main component) -Co pre-alloyed powder form was added directly into the cemented carbide wet grinding prepared rare earth carbide containing rare earth carbide. The surface of sintered alloy was observed and analyzed by SEM and EDS. The results show that during the vacuum sintering process, the rare earth elements La and Ce in the alloy are separated and Ce is migrated to the surface of the alloy, and the enriched rare earth phase is formed on the surface of the alloy sintered body. This article explains this phenomenon in terms of thermodynamics.