Influence of dysprosium substitution on magnetic and mechanical properties of high intrinsic coercivity Nd-Fe-B magnets prepared by double-alloy powder mixed method

• Published in: Journal of rare earths 2016-07, Vol.34 (7), p.689-694
• Main Author: 胡志华 瞿海锦 马冬威 罗成 王会杰
• Format: Article
• Language: English
• Subjects: double-alloy powder mixed method; intrinsic coercivity; magnetic properties; mechanical properties; Nd-Fe-B magnets; rare earths; 制备; 力学性能; 合金粉末; 混合法; 烧结Nd-Fe-B磁体; 烧结钕铁硼磁体; 钕铁硼永磁材料; 高矫顽力
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/s1002-0721(16)60080-7

The double-alloy powder mixed method is very proper for developing new small-mass products by changing the composi- tion of sintered Nd-Fe-B magnets, and there is little research on this aspect. The variation on magnetic and mechanical properties of high intrinsic coercivity Nd-Fe-B magnets prepared by double-alloy powder mixed method was discussed, which is a method blend- ing two-type main phase alloy powders with different components. The results showed that the intrinsic coercivity and density of sin- tered Nd-Fe-B magnets increased gradually with the increase in Dy content, and the double-alloy powder mixed method could obtain high intrinsic coercivity Nd-Fe-B magnets with good crystallographic alignment and microstructure. The bending strength of sintered Nd-Fe-B magnets declined, and the Rockwell hardness of sintered Nd-Fe-B magnets first declined, and then increased with the in- crease in Dy content. The microstructure showed that there existed the phenomenon that the Dy element diffused into main phase dur- ing sintering process, and the distribution of Dy content in main phase had some variation in homogeneity as a result of incomplete reaction between the double-alloy powder types.