z值影响Sm(CoFeCuZr)_z磁性能的机理研究
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摘要
通过粉末冶金法制备了不同z值(z=7.5～8.5)的Sm(CoFeCuZr)_z磁体。利用磁性能测量系统、X射线衍射分析、电子探针以及透射显微镜等对磁体的性能、组成相、析出相含量、微观结构及元素分布进行表征,通过分析解释了磁性能随z值变化的内在机理。结果表明:随z值增大,胞状结构尺寸增大,高饱和磁化强度的2:17R相增多导致剩磁Br升高;z值增大导致富Zr析出相增多,引起方形度H_k/H_(cj)下降;z值通过改变Cu元素在2:17R相界面位置的富集程度来改变矫顽力H_(cj)的大小,在一定范围内(z<8.2)该位置Cu含量越高,矫顽力越大。
The Sm(CoFeCuZr)_z permanent magnets with different z values(z=7.5～8.5) were prepared by powder metallurgy. The properties,constituent phase, precipitated-phase content, microstructure and element distribution of the magnet were characterized by magnetic measurement system, X-ray diffraction analysis, electron probe and transmission electron microscope. Magnetic properties changed with z value, and the inherent mechanism was explained. The results show that with the increase of z value the size of cell structure increases and the 2:17 R phase with high saturation magnetization also increases in amount, which finally results in the improvement of remanence Br,The precipitated Zr-riched phase increases when the z value increases, which has a weakening effect on the squareness H_k/H_(cj). The z value changes the enrichment of Cu element at the edge of 2:17 R phase, and thus influences the coercivity H_(cj). Within the certain range(z <8.2),the higher the content of Cu at that edge, the larger the coercivity.
The Sm(CoFeCuZr)_z permanent magnets with different z values(z=7.5～8.5) were prepared by powder metallurgy. The properties,constituent phase, precipitated-phase content, microstructure and element distribution of the magnet were characterized by magnetic measurement system, X-ray diffraction analysis, electron probe and transmission electron microscope. Magnetic properties changed with z value, and the inherent mechanism was explained. The results show that with the increase of z value the size of cell structure increases and the 2:17 R phase with high saturation magnetization also increases in amount, which finally results in the improvement of remanence Br,The precipitated Zr-riched phase increases when the z value increases, which has a weakening effect on the squareness H_k/H_(cj). The z value changes the enrichment of Cu element at the edge of 2:17 R phase, and thus influences the coercivity H_(cj). Within the certain range(z <8.2),the higher the content of Cu at that edge, the larger the coercivity.
引文
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[10]Horiuchi Yosuke,Hagiwara Masaya,Okamoto Keiko et al.IEEE Transactions on Magnetics[J],2013,49(7):3221
[11]Hadjipanayis G C,Tang Wei,Zhang Y et al.IEEETransactions on Magnetics[J],2000,36(5):3382
[12]Su Shuai(苏帅),Wang Yunqiao(王云峤),Yue Ming(岳明)et al.Metallic Functional Materials(金属功能材料)[J],2015,22(5):6
[13]Wang Qian(王倩),Wang Yanbo(王燕波),Li Yang(李扬)et al.Chinese Journal of Rare Metals(稀有金属)[J],2013,37(6):896
[14]Liu J F,Ding Y,Zhang Y et al.Journal of Applied Physics[J],1999,85(8):5660
[15]Cataldo L,Lefevre A,Ducret F et al.Journal of Alloys and Compounds[J],1996,241(1-2):216
[16]Liu J F,Zhang Y,Dimitrov D et al.Journal of Applied Physics[J],1999,85(5):2800
[17]Liu S,Potts G,Doyle G et al.IEEE Transactions on Magnetics[J],2000,36(5):3297
[18]Gu Zhengfei,Zhang Weihua,Yu Ningsen et al.Material Science and Technology[J],1995,3(2):9
[19]Wang Fuchi(王富耻).Modern Methods for Material Analysis(材料现代分析测试方法)[M].Beijing:Beijing Institute of Technology Press,2006:74
[20]Yosuke Horiuchi,Masaya Hagiwara,Masaki Endo et al.Journal of Applied Physics[J],2015,117(17):C704-1
[21]Xiong X Y,Ohkubo T,Koyama T et al.Acta Materialia[J],2004,52(3):737
[22]Kronmüller H,Goll D.Scripta Materialia[J],2002,47(8):545
[23]Lectard E,Allibert C H.Journal of Applied Physics[J],1994,75(10):6277
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