摘要
利用超声波分解Fe(CO)5,分解产物通过非均相沉淀获得Nd2Fe14B/Fe双相复合磁粉,采用放电等离子烧结技术(Spark Plasma Sintering,SPS)制备出致密的Nd2Fe14B/α-Fe双相复合磁体。研究发现,伴随着软磁相Fe名义含量的增加,硬磁相Nd2Fe14B颗粒表面包覆的纳米Fe颗粒明显增加,包覆更加均匀,双相复合磁体的最大磁能积(BH)m和剩磁Br逐渐增大,在Fe名义含量为15%时获得最佳磁性能:(BH)m=128.2kJ.m-3(16.1MGOe),Br=0.92T,Hcj=607.35kA.m-1。当Fe名义含量超过15%时,纳米Fe在Nd2Fe14B颗粒表面团聚现象加剧,致使磁能积和剩磁下降。
Nano-iron particles, prepared by using sonochemical treatment to decompose carbony iron, were heterogeneously precipitated to produce Nd2Fe14 B/Fe nanocomposite powder. The composite powders were sintered in bulk magnets by spark plasma sintering （SPS）. It was found experimentally that both the maximum magnetic energy product and remanence of Nd2Fe14B/α-Fe magnets increased with increasing of the nominal content of soft magnetic phase. A result of （BH）m =128.2 kJ.m^-3（16.1MGOe）, Br =0.92 T, Hcj =607.35 kA.m^-1 was obtained when the nominal content of the soft magnetic phase was 15%. When the nominal content was higher than 15%, the magnetic properties of the composite declined slightly because of the degradation of coercivity.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2009年第4期523-527,共5页
Journal of the Chinese Society of Rare Earths
基金
北京市自然科学基金重点项目(2041001)
北京市优秀人才培养计划(20041D0501509)
北京工业大学博士科研启动金(52009011200401)资助项目
