摘要
采用熔体快淬及晶化退火工艺制备了纳米双相(Nd,Pr)2Fe14B/α-Fe型磁体,研究了Nb和Zr的添加对磁体磁性能、微观结构和晶化行为的影响。结果表明:添加Nb和Zr可提高α-Fe相的晶化温度,抑制α-Fe的析出和长大,避免亚稳相的形成,从而提高硬磁相的体积百分比。Nb和Zr复合添加能细化晶粒,增强硬磁相和软磁相间的交换耦合作用,显著提高纳米晶双相永磁合金的磁性能。合金(Nd0.4Pr0.6)8.5Fe84.5Nb0.5Zr0.5B6经过最佳热处理后,磁性能达到Br=1.10T,iHc=534.2kA/m,(BH)max=143.6kJ/m3。
Nano composite （Nd, Pr）2Fe14B/α-Fe magnets were prepared by crystallizing the amorphous melt-spun ribbons. Effect of Nb and Zr additions on the magnetic properties, microstructures and crystallization behaviors of the alloys have been investigated. It is found that Nb and Zr additions can increase the precipitating temperature of α-Fe, restrain the formation and the growth of α-Fe, avoid the formation of metastable phases, thus increase the volume fraction of hard magnetic phase. The combined Nb and Zr additions can refine grains, enhancing exchange coupling interaction between the hard and the soft magnetic phases, can obtain the much better magnetic properties. After optimal thermal treatment, the alloy （Nd0.4Pr0.6）8.5Fe84.5Nb0.5Zr0.5B6 has the best magnetic properties, Br=1.10 T, iHc=534.2 kA/m, （BH）max= 143.6 kJ/m^3.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第11期1782-1785,共4页
Rare Metal Materials and Engineering
关键词
纳米双相
钕铁硼
快淬
晶化
nano composite
NdFeB
melt-spinning
crystallization
