各向异性Sm_(12.8)Fe_(87.2)N_x粘结磁体的研究  

Study on Anisotropic Bonded Sm_(12.8)Fe_(87.2)N_x Magnet

作　　者：孙继兵[1] 崔春翔[1] 吴瑞国[1] 王如[1] 张颖[1] 梁志梅[1] 

机构地区：[1]河北工业大学材料学院,天津300130

出　　处：《稀有金属》2005年第1期52-56,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金 (5 0 2 710 2 4);河北省自然科学基金 (5 0 10 13 )资助项目

摘　　要：用粉末冶金法对Sm1 2 .8Fe87.2 合金及其氮化物与粘结磁体的组织形貌、物相及磁性能进行了较为详细的研究。结果发现 ,均匀化退火可以明显减少Sm1 2 .8Fe87.2 合金中的富Sm相与α Fe含量。氮化后Sm2 Fe1 7晶格膨胀形成Sm2 Fe1 7Nx 主相 ,氮化 2 0h内Sm2 Fe1 7Nx 相单胞体积膨胀超过 6% ,在 2 0h有最大值ΔVc/Vc=8.3 6%。氮化后合金中的α Fe含量增加 ,未见相应单胞体积膨胀。Sm1 2 .8Fe87.2 Nx 取向粘结磁体中Sm2 Fe1 7Nx 相的 0 0 6衍射明显增强 ,而其他衍射及α Fe的衍射减弱 ,易轴方向磁体的矫顽力优于磁粉的 。The microstructures, phases and magnetic properties of Sm_(12.8)Fe_(87.2) alloy and its nitride as well as bonded magnet were investigated in detail by means of powder metallurgy process. It is found that homoge-neous annealing can sufficiently decrease the content of α-Fe and the Sm-rich phase. After nitrogenation, the main phase Sm_2Fe_(17)N_x still behaves rhombohedral Th_2Zn_(17)-type structure after lattice expansion which enlarged by 6% in 20 h nitrogenation and the maximum value, ΔV_c/V_c=8.36%, occur when powder was nitrogenated for 20 h. The corresponding lattice expansion in α-Fe is not found. Nitrogenation process promotes the α-Fe content of nitride. The 006 diffraction of Sm_2Fe_(17)N_x phase is obviously enhanced and the rest diffractions of Sm_2Fe_(17)N_x and that of α-Fe are weakened. The coercivities of easy-axis bonded magnets are superior to that of corresponding powders, but remanence and magnetization at the maximum magne-(tic) field are inferior to that of powders.

关 键 词：金属材料 Sm2Fe17型 粘结磁体 物相 氮化 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]