非传统热处理对纳米复相Nd_2Fe_(14)B/α-Fe永磁体磁性能的影响  

Effect of Unconventional Heat Treatment on Magnetic Properties of Nd_2Fe_(14)B/α-Fe Nanocrystalline Permanent Magnets

作　　者：连利仙[1] 刘颖[1] 涂铭旌[1] 查五生[1] 高升吉[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2004年第5期70-73,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家863计划资助项目(2001AA324030);四川省重大科技功关项目(03GG009 006)

摘　　要：为改善纳米复相Nd2Fe14B/α Fe永磁合金微结构以提高磁性能,用熔体块淬和晶化热处理的方法制备纳米复相Nd2Fe14B/α Fe永磁体,研究快速热处理、磁场热处理及动态晶化热处理等非传统热处理对Nd10.5Fe76.4Co5Zr2B6.1永磁体组织结构和磁性能的影响。采用XRD、DTA、AFM、TEM等方法对合金的组织结构、晶化行为进行研究。结果表明:与传统热处理相比,非传统热处理不仅可促进快淬NdFeB粉末的晶化,降低晶化温度,缩短晶化时间,而且能细化晶粒,增强晶粒间磁交换耦合作用,提高磁性能。Nd10.5Fe76.4Co5Zr2B6.1合金快淬粉末在685℃经6min动态晶化热处理后制得的粘结磁体获得最佳磁性能,剩磁Br为0.684T,内禀矫顽力Hcj为685kA/m,磁感矫顽力Hcb为439kA/m,最大磁能积(BH)m为79kJ/m3。In order to improve the magnetic properties of Nd2Fe14B/α-Fe nanocrystalline permanent magnets, effect of un conventional heat treatment, including rapidly annealing, magnetic-field heat treatment and dynamic crystallization, on microstructure and magnetic properties of Nd10.5Fe76.4 Co5Zr2B6.1 permanent magnets prepared by rapid quenching and post heat treatment was investigated. The microstructure and crystallization behavior were studied by X-ray diffraction (XRD), differential thermal analysis (DTA), atomic force microscopy (AFM) and transmission electron microscopy (TEM). The results show that, compared with the conventional heat treatment, unconventional heat treatment can promote crystallization of melt-spun NdFeB powder from amorphous phase, decrease the crystallization temperature and shorten the crystallization time. Moreover unconventional heat treatment can refine grains, enhance the exchange coupled interaction between the grains, and increase the magnetic properties. The optimal magnetic properties of Nd10.5Fe76.4 Co5Zr2B6.1(Br = 0.684 T, Hcj = 685 kA/m, Hcb = 439 kA/m, (BH)M = 79 kJ/m3) were obtained after dynamic crystallization heat treatment at 685°C for 6 min.

关 键 词：稀土 热处理 纳米复相磁体 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]