添加Dy和Nb的纳米复合Pr2Fe14B/α-Fe永磁合金结构和磁性

添加Dy和Nb的纳米复合Pr₂Fe₁₄B/α-Fe永磁合金结构和磁性

摘要: 研究了添加Dy和Nb对纳米复合Pr₂Fe₁₄B/α-Fe永磁合金形成,组织结构及磁性的影响。结果表明:Pr₉Fe₈₅B₆非晶带的晶化过程,在α-Fe相初始晶化之后,出现Pr₂Fe₂₃B₃亚稳相,最终形成Pr₂Fe₁₄B+α-Fe两相组织.而添加Dy或同时添加Dy和Nb后晶化过程不出现亚稳相.添加Dy和Nb元素显著地提高了纳米复合永磁合金的磁性能。最终获得了磁性能为H_CI=702.4kA/m,B_r=1.03T,(BH)_max=132.6kJ/m³的纳米晶复合Pr₈Dy₁Fe₈₄Nb₁B₆永磁材料。

Abstract: The effects of Dy and Nb substitution on the formation, microstructrure and magnetic properties of Pr₂Fe₁₄B/α-Fe nanocomposites have been investigated. It was found that for Pr₉Fe₈₅B₆ ribbons, the metastable Pr₂Fe₂₃B₃ phase occurs after the initial crys. tallization of a-Fe and prior to the formation of the finial mixture of Pr₂Fe₁₄B and α-Fe. However, no metastable phase was observed during the crystallization of Dy or both Dy and Nb substituted ribbons. The addition of both Dy and Nb can cause the significant improvement of the magnetic properties.