废旧烧结Nd-Fe-B磁体添加Ce再制造技术研究
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摘要
烧结Nd-Fe-B磁体再生过程中会引起稀土元素的氧化和损失,因此重新烧结时无法致密化。添加Ce金属,有助于再生磁体的致密化,并优化磁体的显微组织结构。通过低成本Ce金属的添加,成功实现再生磁体的综合性能优化。并研究了废旧烧结Nd-Fe-B磁体的吸氢过程,用BH测试仪测试了再生磁体的磁性能;采用扫描电镜观察了再生磁体的微观结构。添加4%Ce(质量分数)时,在1 350 K烧结、773 K热处理条件下,再生磁体的剩磁达到了原磁体的98%以上,内禀矫顽力超过了原磁体。
During the recycling process of sintered Nd-Fe-B magnets,rare earth elements will be oxidized and lost,thus the densification of the recycled magnets is interfered. The addition of Ce metal is helpful to densify the recycled magnet and optimize the microstructure of the magnet. Through the addition of low-cost Ce metal,the comprehensive performance of the recycled magnet was successfully optimized. The hydrogen absorption process of waste sintered Nd-Fe-B magnets was also studied. The magnetic properties of the recycled magnets were tested by BH tester,and the microstructure of the magnet was observed by scanning electron microscopy. The results show that when 4% Ce( mass percent)is added,the remanence of the recycled magnet reaches more than 98%of that of the original magnet,and the intrinsic coercivity exceeds that of the original magnet under the conditions of 1 350 K sintering and 773 K heat treatment.
During the recycling process of sintered Nd-Fe-B magnets,rare earth elements will be oxidized and lost,thus the densification of the recycled magnets is interfered. The addition of Ce metal is helpful to densify the recycled magnet and optimize the microstructure of the magnet. Through the addition of low-cost Ce metal,the comprehensive performance of the recycled magnet was successfully optimized. The hydrogen absorption process of waste sintered Nd-Fe-B magnets was also studied. The magnetic properties of the recycled magnets were tested by BH tester,and the microstructure of the magnet was observed by scanning electron microscopy. The results show that when 4% Ce( mass percent)is added,the remanence of the recycled magnet reaches more than 98%of that of the original magnet,and the intrinsic coercivity exceeds that of the original magnet under the conditions of 1 350 K sintering and 773 K heat treatment.
引文
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[4]李超,刘卫强,张东涛,等.Nd H纳米助剂回收制备烧结钕铁硼永磁体的研究[J].功能材料,2014,17(45):17059.
[5]李现涛,岳明,李萌,等.块状烧结钕铁硼废料的氢处理回收技术研究进展[J].稀土,2016,37(3):123.
[6]李现涛.烧结钕铁硼废料的再制造技术及机理研究[D].北京:北京工业大学,2016.
[7]张月明.Ce磁体的力学性能及Ce对再生磁体微结构的影响[D].北京:钢铁研究总院,2017.
[8]李岩峰,赖彬,朱明刚,等.烧结钕铁硼磁体边界相的调控技术机制[J].稀有金属,2015,39(11):988.
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