摘要
研究磁粉粒度对注射成形粘结NdFeB磁体性能的影响。结果表明：随着磁粉粒度减小,喂料粘度值升高,粘流指数n值降低,其注射工艺性能更好;制备粘结磁体的抗压强度更高,但其不可逆磁损失也增大。NdFeB磁粉粒度太粗或太细均不利于磁体性能的提高,其最佳粒径范围是80-100μm;通过粒度级配可以降低喂料粘度值或提高临界装载量,在此基础上制备高性能的各向异性粘结NdFeB磁体,其Br、iHc、（BH）max及σbb分别为878 mT、1 212.3 kA/m、128 kJ/m^3及73 MPa。
The effects of particle size on the properties of injection-molded bonded NdFeB magnet were investigated. The results showed that, as the particle size decreased, the feedstock＇ viscosity increased and its fluid exponent decreased, which indicated that the feedstock was more excellent in process properties; the compressive strength of the bonded magnet was improved while the irreversible magnetic flux loss reduced. It was also found that the optimal particle size for injection-molded bonded magnet was 80-100 μm, the particle size smaller or higher than this range resulted in deterioration in properties. By varying the proportions of particles of different sizes, the viscosity of the feedstock decreased or critical powder volume fraction increased. On the basis of these, the injection molding anisotropic bonded NdFeB magnet with the high magnetic properties was obtained, whose remanence Br, intrinsic coercivity iHc, maximum energy product （BH）max and compressive strength σbb are 878 mT, 1 212.3 kA/m, 128 kJ/m^3 and 73 MPa respectively.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2007年第10期1627-1631,共5页
The Chinese Journal of Nonferrous Metals
基金
高等学校博士学科点专项科研基金资助项目(20040008015)
教育部长江学者和创新团队发展计划资助项目(I2P407)
作者简介
通讯作者：段柏华，讲师，博士；电话：010-62332727；E-mail：dbh72@163．com
