烧结Nd-Fe-B磁体多主相复合制备及微观结构研究

Composite Preparation and Microstructure of Sintered Nd-Fe-B Magnets with Multiple Main Phase

利用双合金混粉法添加Dy实现烧结Nd-Fe-B磁体多主相复合制备,研究磁体的磁性能和微观结构。研究结果表明:单主相合金制备烧结Nd-Fe-B磁体时,主相晶粒中Dy含量差别不大,颗粒状富Nd相中所含Dy含量明显高于主相晶粒中所含Dy含量。双合金混粉法制备烧结Nd-Fe-B磁体时,能够提高磁体的取向,磁体中存在多主相晶粒复合;富Nd相中含Dy元素的总量降低,主相晶粒中含Dy元素的总量增加。烧结Nd-Fe-B磁体的多主相复合制备可以利用双合金混粉法得以实现;同时,相同合金成分时,双合金混粉法制备出的烧结Nd-Fe-B磁体的磁性能优于单合金法制备出的磁体,烧结Nd-Fe-B磁体的多相复合制备能够提高磁体的磁性能。

The multiple main phase composite preparation of sintered Nd-Fe-B magnets was realized by the Dy addition and dual-alloy powder mixed method, and the magnetic properties and microstructure of magnets were studied. The results showed that there existed the same Dy content in main phase grains, and the Dy content of Nd-rich phase was obviously higher than that of main phase grains when sintered Nd-Fe-B magnets were prepared by the single main phase alloy method. The orientation of sintered Nd-Fe-B magnets was improved by the double-alloy mixed powder method, and there existed many grains with different main phase components in the same magnet. The total content of Dy in the Nd-rich phase decreased, and the total content of Dy in the main phase grains increased by the double-alloy mixed powder method. The multiple main phase composite preparation of sintered Nd- Fe-B magnets could be realized by the double-alloy mixed powder method. At the same time, as for the same alloy composition, the magnetic properties of sintered Nd-Fe-B magnets prepared by the double-alloy mixed powder method were higher magnetic properties than that of sintered Nd-Fe-B magnets prepared by the single main phase alloy method. The of sintered Nd-Fe-B magnets can be improved by the multiple main phase composite preparation.