Antioxidation Study of Sm(Co, Cu, Fe, Zr)z-Sintered Permanent Magnets by Metal Injection Molding
来源期刊：JOURNAL OF RARE EARTHS2006年第5期
论文作者：Tao Siwu Qu Xuanhui Tian Jianjun Zhang Shengen
Key words：metal injection molding; Sm(Co,Cu,Fe,Zr)z permanent magnets; antioxidation; rare earths;
Abstract: Antioxidation effects on Sm(Co, Cu, Fe, Zr)z-sintered magnets treated by different methods were studied through 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 the other methods. The alloy powders treated in stearic acid (SA) solution and polymethyl methacrylate (PMMA) solution can prevent powders from oxidation for a short period of time. Silane solution is not suitable for metal injection molding (MIM) because it severely damages the magnetic properties and microstructure of Sm(Co, Cu, Fe, Zr)z-sintered magnets. SA solution can not only prevent powders from oxidizing in MIM, but also does not damage magnetic properties and microstructure of Sm(Co,Cu, Fe, Zr)z magnets. The oxygen content of Sm(Co, Cu, Fe, Zr)z-sintered magnets by MIM is 3300 μg·g-1.
Tao Siwu1，Qu Xuanhui1，Tian Jianjun1，Zhang Shengen1
(1.School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)
Abstract:Antioxidation effects on Sm(Co, Cu, Fe, Zr)z-sintered magnets treated by different methods were studied through 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 the other methods. The alloy powders treated in stearic acid (SA) solution and polymethyl methacrylate (PMMA) solution can prevent powders from oxidation for a short period of time. Silane solution is not suitable for metal injection molding (MIM) because it severely damages the magnetic properties and microstructure of Sm(Co, Cu, Fe, Zr)z-sintered magnets. SA solution can not only prevent powders from oxidizing in MIM, but also does not damage magnetic properties and microstructure of Sm(Co,Cu, Fe, Zr)z magnets. The oxygen content of Sm(Co, Cu, Fe, Zr)z-sintered magnets by MIM is 3300 μg·g-1.
Key words:metal injection molding; Sm(Co,Cu,Fe,Zr)z permanent magnets; antioxidation; rare earths;
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