磁粉表面改性及粒度对注射成形粘结NdFeB磁体性能的影响  

Effect of surface modification and particle size on the properties of the bonded NdFeB magnet prepared by injection molding

作　　者：段柏华[1] 曲选辉[1] 叶斌[2] 邹黎明[2] 徐征宙[2] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《功能材料》2005年第1期29-31,共3页Journal of Functional Materials

基　　金：国家高新技术研究发展计划(863计划)资助项目(2001AA337050);国家自然科学基金资助项目(50025412)

摘　　要：注射成形粘结NdFeB磁体满足了市场对磁体小型化、轻型化及高性能化的要求,因而有着广泛的应用前景.本文研究了磁粉特性对注射成形粘结磁体性能的影响,结果表明:采用硅烷对磁粉进行表面改性,能有效提高NdFeB磁粉的抗氧化性及相应粘结磁体的磁学及力学性能;同时NdFeB磁粉粒径太粗太细均不利于磁体性能的提高,其最佳粒径范围是60～100μm.The bonded NdFeB magnets prepared by injection molding meet with the development tendency of the magnet in small volume, light weight and high performance, and have a good prospect. The effect of powder character on the properties of injection-molded anisotropic bonded NdFeB magnet was investigated. The results showed that both the anti-oxidation behaviors of the NdFeB particle and the properties of the bonded magnet are improved effectively by the surface modification on the powders with the silane. It was also found that both coarse powder and fine powder result in the deterioration of magnetic properties, and the optimal particle size for injection-molded bonded magnet was 60-100 μm.

关 键 词：注射成形 粘结钕铁硼磁体 表面改性 粉末粒度 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]