摘要
研究了烧结NdFeB磁体强韧性和磁性能与磁粉粒度的关系。结果表明:磁粉平均粒度从4.0μm减小到2.9μm时,磁体的晶粒尺寸减小,抗弯强度从212MPa增大到312MPa,增大了50%。磁体的Br和(BH)m在磁粉平均粒度为3.3μm时有最佳值。激光粒度分布表明平均粒度减小时磁体的iHc增大,Br和(BH)m减小,同时导致磁粉中微细颗粒所占的分数增多。当平均粒度增大时,磁粉中大直径颗粒占的分数增多,磁性能均降低。
The dependence of fracture strength and magnetic properties of sintered NdFeB magnets on jet-milling particle size was studied. It was found that as mean particle size decreased from 4.0 μm to 2.9 μm, thet grain size in magnets decreased, which resulted in the bending strength rapidly increased from 212 MPa to 312 MPa, about 50 % increment. Optimum magnetic properties of Br and （BH）m were achieved at mean particle size of 3.3 μm. iHc increased with the decrease of mean particle size, but the Br, （BH）m decreased due to the increase of amount of much more smaller particles. When mean particle size is more than 3.3 μm, all of the magnetic properties decrease because of presence of much more larger particles.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第11期2034-2036,共3页
Rare Metal Materials and Engineering
基金
中国石油大学(华东)科研项目(Y071808)资助
关键词
粒度
钕铁硼
磁性能
断裂强度
particle size
NdFeB
magnetic properties
fracture strength
