晶界添加PrNd和Pr75Al15Cu10对细晶无重稀土烧结钕铁硼磁体磁性能和力学性能的影响
Effect of grain boundary addition of PrNd and Pr75Al15Cu10 on magnetic and mechanical properties of fine-grained heavy-rare-earth-free sintered Nd-Fe-B magnets
彭研硕 1李建忠 1吴厅兰 1金伟洋 1周鸿波 1刘孝莲2
作者信息
- 1. 宁波永久磁业有限公司,浙江宁波 315000
- 2. 宁波永久磁业有限公司,浙江宁波 315000;杭州电子科技大学,浙江 杭州 310018
- 折叠
摘要
分别采用晶界添加1％(质量分数)Pr25Nd75控氧及气流磨加氧工艺、晶界添加2％(质量分数)Pr75Al15 Cu1.合金方法,结合细晶工艺制备出了晶粒尺寸为3.5～4.2μm的无重稀土 50H烧结钕铁硼磁体.通过对比分析了磁体的磁性能和力学性能后可知,晶界添加1％(质量分数)PrNd控氧磁体矫顽力18.46 kOe,抗弯强度为492 MPa,矫顽力与加氧工艺的磁体基本相同,抗弯强度高65 MPa.晶界添加2％(质量分数)Pr75Al15Cu10合金的磁体矫顽力达到19.04 kOe比添加1％(质量分数)PrNd的控氧磁体高0.58 kOe,抗弯强度达到506 MPa,比添加1％(质量分数)PrNd磁体高14 MPa.分析结果表明,细晶控氧工艺比预氧化工艺磁体中氧含量低134×10-6.晶界添加2％(质量分数)Pr75Al15Cu10使Pr、Cu元素在晶界聚集,使磁体的晶界相分布均匀、连续从而提升了磁体的矫顽力.同时添加2％(质量分数)Pr75Al15Cu10合金有效增加了磁体晶界相比例和优化显微组织,可以有效地阻碍裂纹的传播和扩展,使磁体的抗弯强度得到改善.
Abstract
Fine-grained heavy-rare-earth-free sintered NdFeB magnets were prepared by adding 1％(mass fraction)Pr25Nd75 and 2％(mass fraction)Pr75Al15Cu10.Furthermore,addition of 1％(mass fraction)PrNd was utilized by oxygen controling and adding oxygen during the jet-milling process.The average grain size of the magnets was 3.5-4.2 μm.Magnetic and mechanical properties of the investigated magnets were analyzed and compared.The co-ercivity of the magnets with 1％PrNd(mass fraction)addition by oxygen controling was 18.46 kOe and the bending strength was 492 MPa,which was basically the same as the magnets by adding oxygen in coercivity,and 65 MPa higher than the magnets by adding oxygen in bending strength.The coercivity of the magnets with addition of 2％(mass fraction)Pr75Al15Cu10 reached 19.04 kOe,which was 0.58 kOe higher than the magnets with addition of 1％PrNd by oxygen controling.The bending strength of the magnets with addition of 2％(mass fraction)Pr75Al15Cu10 reached 506 MPa,which was 14 MPa higher than the magnets with addition of 1％(mass fraction)PrNd by oxygen controling.The results showed that the oxygen content in the magnets with fine-grained controlled oxygen process was 134 × 10-6 lower than the magnets with oxygen added during the jet-milling process.Pr and Cu elements were congregated the grain boundary via the addition of 2％(mass fraction)Pr75Al15Cu10,which resulted in uniform and continuous distribution of the grain boundary.The optimized grain boundary improved the coercivity of the mag-nets.Meanwhile,the addition of 2％(mass fraction)Pr75Al15Cu10 alloy effectively enhanced the proportion and dis-tribution of the grain boundary phase,which could effectively hinder the propagation and expansion of cracks,there-by improving the bending strength of the magnets.
关键词
烧结钕铁硼磁体/晶界添加/晶粒细化/矫顽力/抗弯强度Key words
sintered Nd-Fe-B magnets/grain boundary addition/grain refinement/coercivity/bending strength引用本文复制引用
出版年
2024
NETL
NSTL
万方数据