摘要
采用粉末冶金法制备烧结Sm(Co0.72Fe0.15Cu0.1Zr0.03)7.5,研究磁粉粒度对磁体磁性能的影响。结果表明,增加球磨时间将细化磁粉粒度,提高磁粉的比表面积,有利于降低磁体的烧结温度。球磨5,7,9,11 h的磁粉的最佳烧结温度分别为1225,1225,1215,1215℃。磁粉球磨9 h,烧结温度为1215℃条件下制备的磁体的综合磁性能最优:剩磁Br=0.94 T,感应矫顽力Hcb=708.4 kA.m-1,最大磁能积(BH)max=171.9 kJ.m-3,内禀矫顽力Hci=2276.6 kA.m-1;温度稳定性良好,长径比为0.7的磁体经550℃老化2 h后的磁通不可逆损失低于5%,有望应用于550℃环境中。
The influence of mean particle size on magnetic properties of Sm （ Co0.72Fe0.15 Cu0.1 Zr0.03 ）7.5 sintered magnets, prepared by the conventional powder metallurgy method, was studied. With increasing ballmilling time, mean particle size decreases, specific surface increases, and sintering temperature decreases. The optimum sintering temperature of powders fabricated by ball-milling for 5, 7, 9 and 11 h are 1225, 1225, 1215 and 1215℃ respectively. The optimum value of Br, （BH）max, Hob and Hci of Sm（Co0.72Fe0.15 Cu0.0Zr0.03）7.5 sintered magnets with powders ball-milling for 9 h and sintering at 1215℃ can reach 0.94 T, 708.4 kA·m^-1, 171.9 kJ·m^-3 and 2276.6 kA·m^-1 respectively, and the irreversible flux loss is less than 5% after the sample ageing at 550 ℃ for 2 h, so the temperature stability improves and the magnets may be expected to be applied in the circumstances of 550 ℃.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2006年第4期456-460,共5页
Journal of the Chinese Society of Rare Earths
基金
四川省重点科技项目(02GG009-011)
四川省应用基础研究项目(05JY029-072)
四川省杰出青年基金(02ZQ026-047)资助
关键词
烧结Sm(Co
Fe
Cu
Zr)x
磁粉粒度
磁性能
稀土
Sm（Co, Fe, Cu, Zr ）, sintered magnets
mean particle size
magnetic properties
rare earths
