吸氢对HDDR各向异性NdFeB材料的影响  

Effect of Hydrogenation on Properties of HDDR Anisotropic NdFeB

作　　者：仝成利[1] 孙爱芝[1] 贾成厂[1] 韩景智[2] 肖耀福[1] 王润[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京大学物理学院,北京100871

出　　处：《稀有金属》2004年第6期971-974,共4页Chinese Journal of Rare Metals

基　　金：国家"8 63"计划新材料领域资助项目 (2 0 0 1AA32 4 0 1 6) ;北京市科委新材料基地资助项目 (H0 1 1 51 0 0 4 0 1 2 2 )

摘　　要：对d HDDR方法制备各向异性Nd1 3FebalB7Co1 1 Zr0 .1 磁粉过程中吸氢处理阶段进行了研究。发现在 933K左右的温度范围内 ,氢压为 0 .1MPa的条件下进行低温吸氢 ,材料发生了剧烈的歧化分解 ,导致材料的各向异性消失 ,这在处理过程中是应避免的 ;而在 373～ 833K温度范围内进行低温吸氢时 ,材料具有优异的磁性能 ,特别是在 473～ 573K时 ,低温吸氢处理过程有明显的细化粉末颗粒的作用。吸氢时间对材料磁性能几乎没有影响。升温过程中保持合适的氢分压既可以避免材料发生剧烈的歧化反应而破坏了磁各向异性 ,又有利于提高材料的矫顽力 ,从而制备具有高性能的各向异性NdFeB材料。当升温过程中的氢压保持在 0 .0 6MPa时 ,最终可以制得矫顽力和各向异性均较好的磁粉 ,其磁体的性能为 :Br=0 .887T ,iHc=885kA·m- 1 ,DOA =0 .61 ,(BH) max=1 2 5kJ·m- 3。The effects of hydrogenation at the low temperature on the magnetic properties of NdFeBCoZr were examined. The results show that the hydrogenation temperature should be lower than 933 K, and a higher one will cause the anisotropy of NdFeB disappeared with a rapid disproportionation. The most appropriate temperature should be 473～573 K, for its notable crash function. The hydrogen pressure, during the temperature-rising course before disproportionation stage, has some effects on magnetic powders performance. If the hydrogen pressure is higher than the balance pressure of the reaction, the violent disproportionation reaction would lead to the anisotropy of materials disappeared rapidly. It is helpful for both anisotropy and coercivity of the materials that the hydrogen pressure lays 0.06 MPa during the course. The performance of the magnets is: B_r=0.887 T, _iH_c=885 kA·m -1, DOA=0.61, (BH)_ max=125 kJ·m -3.

关 键 词：金属材料 氢化-歧化-脱氢 再复合 各向异性 NDFEB 吸氢处理 氢压 稀土 

分 类 号：TM273[一般工业技术—材料科学与工程]