摘要
利用熔体快淬法和晶化退火处理工艺制备纳米晶复合NdFeB永磁合金,研究添加Co和Zr元素对合金晶化行为、微结构和磁性能的影响。结果表明,添加Co元素降低了晶化相的析出温度,提高了合金的剩磁;进一步增加Zr元素后,合金的晶化行为由两步晶化变为软硬磁相同步析出,合金的矫顽力明显提高,晶粒得到细化,软、硬磁相之间的交换耦合作用显著增强,从而使合金Nd_9.5Fe_76Co_5Zr_3B_6.5表现出优异的综合磁性能,即J_r=0.93T,_iH_c=687kA/m,(BH)_max=129kJ/m3。
Nanocomposite NdFeB magnets were prepared by melt-spun and crystallization annealing. Effects of Co and Zr addition on the crystallization behavior, microstructure and magnetic properties of the magnets were investigated. Results show that Co addition decreases the precipitation temperature of crystalline phases and increases the remanence. After further addition of Zr, the crystallization behavior changes from a two-step to a single-step process, the coercivity is increased markedly and the grains are refined. The exchange coupling interaction between the soft magnetic phase and the hard phase is enhanced obviously; as a result, the Nd9.5Fe76Co5Zr3B6.5 alloy exhibits excellent overall properties, i.e. Jr=0.93 T, iHc=687 kA/m and （BH）max= 129 kJ/m3.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第9期1611-1614,共4页
Rare Metal Materials and Engineering
基金
上海高校培养优秀青年教师科研专项基金(06XPYQl9)
上海市教委重点学科(J51402)
关键词
NDFEB
微结构
磁性能
纳米复合
晶化行为
交换耦合
NdFeB
microstructure
magnetic properties
nanocomposite magnets
crystallization behavior
exchange coupling interaction
