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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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
