【作者】 张深根； 田建军； 曲选辉； 陶斯武；

【Author】 Zhang Shengen, Tian Jianjun, Qu Xuanhui, Tao Siwu (School of Material 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；

【摘要】 通过热重和差热实验研究了不同抗氧化工艺对Sm(Co,Cu,Fe,Zr)z合金粉末抗氧化效果和永磁体性能的影响,采用SEM,EDS对磁体显微组织的变化进行分析。实验结果表明:采用硅烷处理后的粉末,其抗氧化效果最好;硬脂酸(SA)和聚甲基丙烯酸甲酯(PMMA)也能在短期内起到很好的抗氧化作用。硅烷对永磁体性能和显微组织影响严重,不适于注射成形制备烧结的永磁体;而SA溶液处理疗法既不影响永磁体的性能和微观组织,也能在注射工艺中起到很好的防氧化作用。注射成永磁体的氧含量最终可以控制在0．33％。更多还原

【Abstract】 Antioxidation effects on the powders and sintered magnets of Sm(Co, Cu, Fe, Zr)z treated by of different methods were studied by TGA and DTA. Microstructure of Sm(Co, Cu, Fe, Zr)z sintered magnets was analyzed through SEM and EDS. The results indicate that the antioxidation effect of the alloy powder treated in silane solution is better than that of other methods. The alloy powders treated in stearic acid (SA) solution and polymethyl methacrylate (PMMA) solution that can prevent powders from oxidizing for short time. Silane solution is not suitable for metal injection molding (MIM), because it seriously damages the magnetic properties and microstructure of Sm (Co, Cu, Fe, Zr)z sintered magnets. SA solution not only can prevent powders from oxidizing in MIM, but also less damages magnetic properties and microstructure of Sm(Co, Cu, Fe, Zr)z magnets. Oxidation content is 0.33% of Sm(Co, Cu, Fe, Zr)z sintered magnets prepared by MIM.更多还原