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研究了烧结和时效含镝钕铁硼磁体。通过对不同状态磁体的磁滞曲线,场发射扫描电镜以及能谱对磁体的磁性能,微结构以及成分进行了分析。结果表明,除了主晶相外,镝元素主要分布在富钕相,钕镝氧化物和位于晶界的富镝颗粒中。优化时效过程促进了镝在磁体中合理的扩散以及分布,镝在烧结磁体,高温时效磁体以及优化时效磁体中富钕相,钕镝氧化物以及含镝颗粒中的含量减少,证明了优化时效后,镝元素在磁体中的合理分布,导致了含镝钕铁硼永磁合金矫顽力的提高。
Sintered and aged dysprosium-containing neodymium-iron-boron magnets were investigated. The magnetic properties, microstructure and composition of the magnets were analyzed by hysteresis curves of different states of magnets, field emission scanning electron microscopy and energy spectrum. The results show that, in addition to the main phase, dysprosium is mainly distributed in the neodymium-rich phase, the neodymium-dysprosium oxide and the dysprosium-rich particles located in the grain boundaries. The optimized aging process promotes the proper diffusion and distribution of dysprosium in the magnet, and the content of dysprosium in the neodymium-rich phase, the neodymium-dysprosium oxide and the dysprosium-containing particles in the sintered magnet, the high temperature aged magnet and the optimized aging magnet shows that after the optimized aging, The proper distribution of dysprosium elements in the magnet leads to an increase in the coercivity of the dysprosium-containing NdFeB permanent magnet alloy.