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中文摘要：
航空航天及现代工业高技术领域对使用温度达到500℃的永磁材料提出了明确需求.SmCo永磁材料因其高的居里温度、强的磁晶各向异性和高的饱和磁化强度成为现有永磁材料中高温永磁材料的首选.然而,商用的2∶17型SmCo合金因其高的矫顽力温度系数使其最大工作温度不超过300℃.本文重点研究了2∶17型SmCo高温永磁材料、1∶7型纳米晶SmCo高温永磁材料以及SmCo高温永磁材料的抗氧化行为;研制出了可以在500℃及550℃应用的2∶17型SmCo高温永磁体;获得了具有各向异性的1∶7型纳米晶SmCo磁体;1∶7型纳米晶SmCo永磁材料在500℃具有良好的结构和磁性能时效稳定性;合金化和表面改性显著提高了SmCo磁体的高温抗氧化能力.
英文摘要：
Permanent magnetic materials capable of operating at high temperature up to 500 ℃ are required in aerospace field and modern industry.SmCo alloys are candidates for high temperature permanent magnets because of their high curie temperature,strong magnetocrystaliine anisotropy field and high saturation magnetization field.However,the service temperature of commercial 2 ∶ 17-type SmCo alloys cannot exceed 300 ℃.Our research focuses on 2 ∶ 17-type SmCo high temperature permanent magnetic materials,1 ∶ 7-type nanocrystalline SmCo high temperature permanent magnetic materials and their oxidation protection.2 ∶ 17-type SmCo permanent magnets capable of operating at 500 ℃ and 550 ℃ are developed; anisotropy is achieved in the 1 ∶ 7-type nanocrystalline SmCo alloys,1 ∶ 7-type nanocrystaliine SmCo alloys show good stability of structure and magnetic properties at 500 ℃ ; and alloying and surface modification can effectively improve the oxidation resistance of the SmCo magnets.
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