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采用晶界添加MgF2制备烧结NdFeB磁体,通过扫描电镜、透射电镜和性能测试,研究了烧结NdFeB磁体的微观组织及其对磁性能、电阻率的提高和耐腐蚀性能的影响。结果表明:添加适量MgF2可实现在磁体剩磁、矫顽力和电阻率提高的基础上,同时提高材料的腐蚀电位,并且在极化曲线的阳极部分相同电位条件下,具有较小的极化电流密度,从而达到改善NdFeB磁体耐腐蚀性能的目的。磁体显微组织研究表明F元素进入晶界相,形成F含量约为30%(原子分数)、以面心立方为基的有序的NdOxFy相,其与磁性能、电阻率的提高和耐腐蚀性能改善有关。
Sintered NdFeB magnets were prepared by adding MgF2 in the grain boundary. The microstructure of the sintered NdFeB magnets and their influence on the magnetic properties, resistivity and corrosion resistance were studied by scanning electron microscopy, transmission electron microscopy and performance testing. The results show that adding proper amount of MgF2 can increase the remanence, coercivity and resistivity of the magnet and increase the corrosion potential of the material at the same time. With the same potential at the anode of the polarization curve, Current density, so as to achieve the purpose of improving the corrosion resistance of NdFeB magnets. Magnet microstructure studies have shown that F elements enter the grain boundary phase to form an ordered NdOxFy phase with a F content of about 30% (atomic fraction) based on face-centered cubic with improved magnetic properties, resistivity and corrosion resistance Performance improvement related.