【作者】 田建军； 张深根； 曲选辉；

【Author】 TIAN Jian-jun, ZHANG Shcn-gen, QU Xuan-hui (State Key Laboratory for Advanced Metals and Materials,School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)

【机构】 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；

【摘要】 采用硅烷、PMMA和SA等溶液对Sm-Co磁粉进行表面处理,通过热重实验和差热分析,研究了不同处理方法对粉末的抗氧化效果的影响。将表面处理后的磁粉,采用传统的粉未冶金工艺制备成烧结永磁体,分析了不同处理方法对磁体性能和微观结构的影响。实验结果表明,经过KH550溶液处理后的磁粉,抗氧化效果比其他方法的效果好,但是明显降低了磁体的性能,恶化了组织结构;采用SA溶液对磁粉进行处理,不但能有效地抑制粉末的氧化,并且对磁体的性能和微观结构没有明显的影响,是一种较理想的粉末表面处理工艺。更多还原

【Abstract】 During the process of Sm-Co sintered permanent magnets fabricated by powder injection molding, magnetic powder is easy to be oxidated, which leads to the degradation of magnetic properties. The Sm-Co magnetic powder surface treatments through silane, PMMA and SA solutions respectively were carried out. The antioxidation effects of magnetic powder with different treatment were studied through TGA and DTA. The treated magnetic powders were fabricated into sintered permanent magnets by traditional powder metallurgy technique. The effects on magnetic properties and the microstructure after different surface treatments were analyzed. The results show that the antioxidation effect of magnetic powder treated in silane solution is better than that of other methods, but magnets properties and the microstructure deteriorate in evidence. The powder treated in SA solution is not only apt to prevent oxidation in the process of mixing and injecting, but the sintered magnets properties and the microstructure are little affected. Therefore, the treatment of magnetic powder in SA solution is a proper technique in the process of injection molding.更多还原