【摘要】 利用硅烷偶联剂KH550对Sm2Fe17Nx永磁粉末进行了表面包覆处理,研究了不同包覆状态的磁粉在300℃以下的氧化行为及其磁性能的变化规律。采用红外光谱(FT-IR)、俄歇电子能谱(AES)分析了磁粉表面有机物的成分、结构及其与磁粉的结合机制。测试了不同温度下磁粉的氧化增重及磁特性参数。结果表明,偶联剂以化学键的方式吸附在磁粉表面,形成了1层网状薄膜,有效地阻止了磁粉与环境中氧的接触,从而提高了磁粉在高温下的抗氧化能力。更多还原

【Abstract】 Silane coupling agent was used to coat the surface of Sm2Fe17Nx magnetic powders. Then the oxidation behaviors of the magnetic powders were examined at the temperatures of 200℃ and 300℃. Structural formula of the silane coupling agent absorbed on the powders surface was investigated by means of Flourier Transfer Infrared Spectrometry (FT-IS) and Auger Electron Spectroscopy (AES). Magnetic properties of the powders were tested by Vibrating Sample Magneto-meter (VSM). It is found that the silane coupling agent forms a net-like film on the powders surface by chemical bonding. Powders coating with the film possess excellent oxidation-resistant capacity as well as good magnetic performance.更多还原