(北京科技大学 材料科学与工程学院，新金属材料国家重点实验室，北京 100083)
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80~100 μm；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/m3及73 MPa
关键字: 粘结磁体；钕铁硼；注射成形；粉末粒度
（State Key Laboratory for Advanced Metals and Materials, School of Materials Science and Engineering,University of Science and Technology Beijing, Beijing 100083, China）
Abstract: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/m3 and 73 MPa respectively
Key words: bonded magnet; NdFeB; injection molding; particle size
