Fe掺杂及球磨处理对Sm_2Co_(17)合金结构和磁性的影响  

Effect of Fe-doping and ball milling on the structure and magnetic properties of Sm_2Co_(17) alloy

作　　者：孙乃坤[1] 杜胜杰 

机构地区：[1]沈阳理工大学理学院,沈阳110159

出　　处：《功能材料》2014年第B12期105-109,共5页Journal of Functional Materials

基　　金：辽宁省自然科学基金资助项目(2013020105);沈阳市科技计划资助项目(F13-316-1-39)

摘　　要：用电弧熔炼法制备Sm2（FexCo1-x）17（z=O，O.3和O.7）母合金锭，均匀化退火后采用球磨方法制备纳米晶合金粉末。研究了Fe掺杂及球磨处理对Sm：（FexCo1-x）17合金结构、居里温度及永磁性能的影响。实验结果表明，随着Fe含量增多，合金中1：5相逐渐减少，当x=0.7时，形成单相2：17型化合物，同时居里温度从938℃（x=0）下降到590℃（x=0.7）。球磨处理过程有利于形成单相2：17纳米合金粉，饱和磁化强度随着球磨时间的增加逐渐增大，同时内禀矫顽力和磁能积与球磨时间的关系呈两头下降的趋势。球磨时间在O．5～1h时，纳米合金粉末的永磁磁性能达到最佳，Sm2Co17的最佳磁性能为4兀Ms=O.65T，1Hc=246．8kA／m，（BH）max=25．5kJ／m^3。A series of Sin2 （Fez Co1-x ）17 （x= 0, 0.3, 0.7） alloy ingots were made by arc-melting method, and then annealed for homogenization. The nanocrystalline Sin2 （FexCOl1-x ）17 powders were prepared by ball milling the annealed sample. Effect of Fe-doping and ball milling on the phase structure, the Curie temperature and mag- netic properties of the alloys has been systematically investigated. The experimental results show that upon in- creasing the Fe content, 1：5 phase in the alloy gradually reduces, and for x= 0.7 sample, 1：5 phase disap- pears, forming a single-phase 2：17 type compound. Curie temperature decreases from 938℃ for the x= 0 sample to 590 ℃ for x=0.7. Meanwhile ball milling process was beneficial for the formation of 2：17 phase and after ball milling for 0.5 h, 1：5 phase in the alloy disappears, forming single-phase nanopowders. With an in- crease of milling periods of time, saturation magnetization gradually increases, while the intrinsic coercive force and magnetic energy product show a tendency of increase at first and then decrease. Samples milled for 0.5-1 h exhibit optimal magnetic properties with （BH）max = 25.5 kJ/m3, iHc = 246.8 kA/m and 4πMs = 0.65 T for Sin2 Co17 nanopowder.

关 键 词：球磨处理 相结构 永磁性能 居里温度 

分 类 号：TM273[一般工业技术—材料科学与工程]