摘要
采用共沉淀法制备钐-铁复合氧化物,先用氢预还原,再用Ca还原,得到成分均一的Sm_2Fe_(17)合金,渗氮后得到Sm_2Fe_(17)N_x磁性材料.着重研究了共沉淀法制备Sm_2Fe_(17)合金的前驱物—钐-铁复合氧化物的最佳沉淀工艺,探索共沉淀还原扩散法合成Sm_2Fe_(17),合金的适宜温度及产物分离剂的选择.结果表明,以氨水为沉淀剂,反应温度为333K,pH=8,陈化时间为18h时共沉淀产物的Fe:Sm原子比最接近理论配比;以共沉淀法制备的复合氧化物为原料合成Sm_2Fe_(17)合金的温度为1273K.EDTA浓度为0.03 mol/L时,Sm_2Fe_(17)合金产物分离效果最好;渗氮后的Sm_2Fe_(17)N_x磁粉性能为B_r=0.83T,H_(cb)=288.4kA/m,H_(ci)=554.9kA/m,(BH)_(max)=58.4kJ/m^3.
The composite oxide of FeSmO3 was first prepared by coprecipitation,and then reduced by calcium followed after hydrogen pre-reduction,finally the single phase of Sm_2Fe_(17)alloy could be obtained.The magnet powder of Sm_2Fe_(17)N_x was obtained by the nitriding treatment of Sm_2Fe_(17)alloy.The optimum process of coprecipitation,the optimum temperature of reduction-diffusion and the separating agent of reduction-diffusion product were also studied.The results showed that the atomic ratio of Fe:Sm approache...
出处
《过程工程学报》
CAS
CSCD
北大核心
2008年第S1期251-255,共5页
The Chinese Journal of Process Engineering
基金
江西理工大学基金
