氢等离子体电弧熔炼法制备低C高纯LaNi5合金的研究  

Preparation of High Purity LaNi5 Alloy with Low Carbon Content by Hydrogen Plasma Arc Melting

作　　者：王宏博 王树茂 武援方 郭秀梅 李志念 WANG Hong-bo;WANG Shu-mao;WU Yuan-fang;GUO Xiu-mei;LI Zhi-nian(Institute of Energy Materials and Technology,GRIM AT Engineering Institute Co.,L td,Beijing 101407,China)

机构地区：[1]有研工程技术研究院有限公司,能源材料与技术研究所,北京101407

出　　处：《稀土》2019年第5期24-31,共8页Chinese Rare Earths

基　　金：北京市科技计划项目(Z171100000917012)

摘　　要：本文采用氢等离子体电弧炉熔炼法,以掺入H2的高纯Ar作为等离子体产生气氛,制得C含量较低的高纯La Ni5合金。首先以99.95%La(原始C含量为0.027%)和99.99%Ni(原始C含量为0.0068%)为原料,分别研究了熔炼气氛掺氢量、熔炼电流、熔炼时间对La Ni5合金中C含量去除效果的影响。进一步以低碳99.95%La(原始C含量为0.007%)和99.999%Ni(原始C含量为0.002%)为原料,设计3因素4水平的正交实验,以探索获得C含量最低的高纯La Ni5合金的最佳熔炼工艺。实验发现当熔炼电流恒定时,合金中的C含量随着熔炼气氛掺氢量和熔炼时间的增加呈现下降的趋势;经过正交实验分析与验证,最佳熔炼工艺为在25%H2+Ar熔炼气氛条件下,熔炼电流为230 A,熔炼30 min,获得的La Ni5合金C含量低至0.0014%,合金的化学纯度为99.983%。In this paper,a hydrogen plasma arc melting method was used,and high-purity argon gas doped with hydrogen was used as the plasma generating atmosphere to obtain the LaNi5 alloy with low C content.99.95%La and 99.99%Ni were used as raw materials.The effects of hydrogen content,melting current and melting time on C content in LaNi5 alloy were studied.According to the results of single variable experiments,orthogonal experiments were designed,with high purity low carbon La and 99.999%Ni as the raw materials,to obtain the best melting process of the LaNi5 alloy with the lowest C content.It was found that when the melting current was up to 250 A,the content of C in the alloy decreased with the increase of hydrogen content and melting time.After orthogonal test analysis and verification,when 25%hydrogen was added and the sample was melted for 30 min at 230 A,the LaNi5 alloy of 99.983%(mass fraction)purity with C content as low as 0.0014%was obtained,which was the optimal method.

关 键 词：高纯 储氢合金 氢等离子体电弧熔炼 

分 类 号：TF841[冶金工程—有色金属冶金]