Ce在纯铁中存在状态和对Fe-Sb合金的作用

采用低O,S含量的纯铁和高真空无坩埚悬浮熔炼技术制备合金。研究了微量Ce(0.1wt%)在Fe中存在形态及对Fe-Sb合金的作用。结果表明:(1)Ce加入Fe中,发现明显提高α-铁素体晶界抗腐蚀性。其晶界上没有发现Ce的存在。但在高温δ相晶界上有网状析出物,并证实该析出物由O,Ce的化合物组成,从萃取粒子的电子衍射分析发现,许多粒子是由CeAlO₃相构成。(2)Ce加入Fe-Sb合金中能起净化晶界的作用,使原先沿晶界分布的Fe₃Sb₂相不再存在,而在晶内发现有CeSb相存在。 关键词：

THE EXISTENT STATE OF Ce IN LOW OXYGEN-AND LOW SULFUR-CONTENT IRON AND THE EFFECT OF Ce ON Fe-Sb ALLOY

Our samples are prepared with low oxygen-and low sulfur-content pure iron or antimony and minute cerium as additive as the case may be by livatation melting method. The existent state of Ce in the pure iron and the effect of Ce on Fe-Sb alloy are examined. The results of our investigation are as follows:(1) We find that the anticorrosive ability of crystal boundary of ferrite can be significantly improved due to the adding of cerium. At the crystal boundaries of ferrite the existence of Ce can not be detected; but meshes have been found at the boundaries of the δ-phase formed at high temperature. It is proved that the meshes has the constituent of CeAlO₃ through electron diffraction anlysis.(2) The crystal boundaries of Fe-Sb alloys may be cleaned by adding Ce. After adding Ce, Fe₃Sb₂ is no longer found at the crystal boundaries of the alloys but there is CeSb in bulk crystals as compared with those alloys without Ce.