快淬Fe_3B/Nd_2Fe_(14)B永磁材料晶化行为及磁性能的研究  

Study on the Crystallization Behavior and Magnetic Properties of Melt-Spun Fe_3B/Nd_2Fe_(14)B Composite Magnets

作　　者：庞利佳[1] 陈菊芳[1] 孙光飞[1] 强文江[1] 彭维波[1] 张锦标 黎文安 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]广东省新会市宇宏科技有限责任公司,广东新会529100

出　　处：《稀有金属材料与工程》2006年第9期1487-1491,共5页Rare Metal Materials and Engineering

基　　金：国家"863"纳米专项(2002AA302602);北京市自然科学基金(2032011)资助

摘　　要：利用熔体快淬和晶化处理的方法制备了快淬Fe3B/Nd2Fe14B永磁材料。采用XRD,DTA,VSM等方法对合金的晶化行为和磁性能进行研究。结果表明:对于Fe3B/Nd2Fe14B熔体快淬永磁粉末,升温速率对各相的析出和分解温度有一定的影响。完全过淬的Nd4.5Fe77B18.5和Nd4Fe77Cr0.5B18.5合金熔体快淬粉在进行973K,7min晶化处理过程中,首先形成Nd2Fe23B3相,然后Nd2Fe23B3相发生分解,其产物为Fe3B/Nd2Fe14B,此后再没有发生其它的相转变。当晶化温度大于953K,保温10min后,样品的剩磁、矫顽力和最大磁能积明显提高。微量元素Cr的添加对相转变温度有影响,同时可以细化晶粒,提高矫顽力,从而改善材料的永磁性能。Fe3B/Nd2Fe14B nanocomposite magnetic powders were prepared by melt quenching and heat-treatment. The microstructure and crystallization behavior were studied by X-ray diffraction （XRD）, differential thermal analysis （DTA）, and vibrating sample magnetometer （VSM）. It is found that the heating-up rate will affect the formation and decomposition of the phases at a certain extent for melt-spun Fe3B/Nd2Fe14B powders. It is confirmed that the overquenched Nd4.5Fe7.7B18.5 and Nd4Fe77Cr0.5B18.5 samples were decomposed to Fe3B/Nd2Fe14B via metastable Nd2Fe23B3 during annealing at 973 K for 7 rnin. Hci, Jr and （BH）max have been obviously improved for the samples annealed above 953 K for l0 rain. The addition of Cr is effective for refining the grain size and increasing the intrinsic coercivity, resulting in an improvement of hard magnetic properties.

关 键 词：Fe3B/Nd2Fe14B永磁材料 熔体快淬 晶化行为 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]