作　　者： ; ; ; ; ; ; ;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《磁性材料及器件》 2010年第2期11-15,共5页

摘　　要： 用熔体快淬法(meltspinning)制备了Nd9Fe86-xB5Tax(x=0,1,2,3)直接淬火纳米晶和部分非晶薄带,研究了过渡族元素Ta取代对纳米复合NdFeB/α-Fe合金组织和性能的影响。结果发现,对于直接淬火纳米晶合金,1%的Ta取代能提高材料的矫顽力和最大磁能积,Ta含量超过1%材料的综合磁性能反而降低。但是,Ta取代并没有起到细化晶粒的效果。为了解Ta取代的作用,研究了部分非晶合金的晶化行为。结果表明,Ta取代明显提高了Nd2Fe14B相的晶化温度,含Ta合金性能降低的主要原因可能是Ta推迟了硬磁相的晶化过程,导致了软磁相的过分长大。同理可解释部分非晶合金经热处理后磁性能远远低于优化的直接淬火纳米晶合金。 Directly quenched nanocrystalline and partly amorphous ribbons of Nd9Fe86-xB5Tax （x=0, 1, 2, and 3） alloys were prepared by melt spinning. The effects of Ta substitution on the microstructure and magnetic properties of nanocomposite NdFeB/α-Fe alloy have been investigated. For the directly quenched alloys, 1%Ta addition increases the coercivity and maximum energy product, but over 1% Ta substitution decreases the magnetic properties. It was also found that Ta addition did not lead to a decreased mean grain size. To clarify the role of Ta substitution, the crystallization behavior and magnetic properties of partly amorphous alloys were investigated. The results indicated that the addition of Ta increases the crystallization temperature of Nd2Fe14B phase. The deterioration in the magnetic properties for Ta added alloys resulted, at least partly, from the fact that Ta retards the crystallization of hard magnetic phase and leads to over-growth of soft magnetic grains. This is most likely also the reason why the partly amorphous and annealed alloys have much worse properties than those of optimally directly quenched alloys.

关 键 词： 永磁材料 纳米复合永磁材料 取代 晶化退火 磁性能

领　　域： [电气工程] [一般工业技术] [一般工业技术]