Sm-Fe-C复合纳米粉的制备及磁性  

Preparation and Magnetic Properties of Sm-Fe-C Composite Nanopowders

作　　者：李志杰[1] 潘学玲[2] 孙维民[1] 廉舒[1] 王福[3] 

机构地区：[1]沈阳工业大学超微粒子研究室,辽宁沈阳110023 [2]辽宁大学物理系,辽宁沈阳110036 [3]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《稀土》2005年第2期29-32,共4页Chinese Rare Earths

基　　金：国家重点基础研究发展规划项目资助(G1999064908);辽宁省教委项目资助(21042206)

摘　　要：在氢等离子体电弧法制备Sm-Fe纳米粉过程中,增加原料中Fe的含量有利于形成Sm-Fe相,在真空烧结炉里进行碳化处理过程中,碳化时间过长,会出现Sm2C和α-Fe相,反之,内部出现未碳化的钐铁相区、碳浓度分布不均匀或碳浓度低,都导致磁性能降低。在500℃碳化4h后,随炉冷却至室温,样晶的磁性能为最佳,达到Ms=89.0emu/g,Mr=13.0emu/g,Hc=212Oe,居里温度同碳化时间关系不大,保持在460℃左右。对Sm-Fe-C微观结构及磁性能等进行了研究。Sm-Fe composite nanopowders were prepared by arc-discharge hydrogenation process.In which the higher Fe content in Sm_2Fe_(17) alloy,the higher Sm-Fe phase content in the composite nanopowders.In the carbonization process using vacuum sinter furnace,the time of carbonization also has a notable effect on the magnetic property.If time is long enough,there are also Sm_2C and α-Fe phase in the nanopowders.If time is too short,there are Sm_2Fe_(17) of un-carbonization,the concentration of carbon is not uniformity and far too low ,all of above can result in decreasing of magnetic property.At 500℃,the time of carbonization is 4 hours,the temperature decreased freely,the magnetic property of Sm-Fe-C composite nanopowders is best:M_s=89.0 emu/g,M_r=13.0 emu/g,H_c=212 Oe.Curie temperature is invariable with the time of carbonization,about 460℃.The structure and magnetic properties of Sm-Fe-C composite nanopowders were investigated systematically.\;

关 键 词：稀土永磁 等离子体 碳化物 复合纳米粉 磁性能 

分 类 号：TG146.45[一般工业技术—材料科学与工程] TM273[金属学及工艺—金属材料]