Al2O3掺杂对烧结钕铁硼磁体电阻率和磁性能的影响
Effect of Al2O3 doping on resistivity and magnetic properties of sintered NdFeB magnets
张梦成 1冯泉妤 2刘友好 2刘家琴 1吴玉程1
作者信息
- 1. 合肥工业大学工业与装备技术研究院,安徽省先进复合材料设计与应用工程研究中心,安徽合肥 230009
- 2. 安徽大地熊新材料股份有限公司,稀土永磁材料国家重点实验室,安徽合肥 231500
- 折叠
摘要
采用晶间掺杂法在钕铁硼合金粉体中掺入Al2O3,制备了Al2O3掺杂的烧结钕铁硼磁体,研究了Al2O3掺杂对钕铁硼磁体的电阻率、磁性能和微观结构的影响.结果表明:磁体电阻率随着Al2O3掺杂量的增加逐步提高,由未掺杂时的125.2 μΩ·cm提高到Al2O3掺杂量为0.5 mass％时的144.4 μΩ·cm,提高了15.3％;磁体矫顽力随着Al2O3掺杂量的增加呈先增大后减小的趋势,未掺杂磁体的矫顽力为13.28 kOe,当Al2O3掺杂量为0.3 mass％时,矫顽力达到最大值14.97 kOe,继续增加Al2O3掺杂量,磁体矫顽力开始下降;剩磁随着Al2O3掺杂量的增加逐步降低,由未掺杂时的13.97 kGs下降到Al2O3掺杂量为0.5 mass％时的12.69 kGs.掺杂适量的Al2O3有利于抑制磁体在烧结过程中的晶粒长大,从而起到细化晶粒的作用,提高磁体矫顽力,同时对温度稳定性也起到一定改善作用.
Abstract
Al2 O3-doped sintered NdFeB magnets were prepared by intergranular doping of Al2O3 into NdFeB alloy powder.Effect of Al2O3 doping on the resistivity,magnetic properties and microstructure of the NdFeB magnets was studied.The results show that the magnetic resistivity gradually increases with the increase of Al2O3 doping content,from 125.2 μΩ·cm without dopiong to 144.4 μΩ·cm when the Al2O3 doping content is 0.5 mass％,increasing by 15.3％.The coercivity of the magnets increases first and then decreases with the increase of Al2O3 doping content.The coercivity of the undoped magnet is 13.28 kOe,and when the Al2O3 doping content is 0.3 mass％,the coercivity reaches its maximum value of 14.97 kOe.Continuing to increase the Al2O3 doping content,the coercivity of the magnets begins to decreases.The magnet remanence gradually decreases with the increase of Al2O3 doping content,from 13.97 kGs without doping to 12.69 kGs when the Al2O3 doping content is 0.5 mass％.An appropriate content of Al2O3 doping is beneficial for inhibiting the grain growth of the magnets during the sintering,thereby refining the grain size,improving the coercivity of the magnets,and improving temperature stability to a certain extent.
关键词
烧结钕铁硼/Al2O3/电阻率/晶间掺杂/矫顽力Key words
sintered NdFeB/Al2O3/resistivity/intergranular doping/coercivity引用本文复制引用
基金项目
安徽省"特支计划"创新领军人才项目(Z2023TP0002)
国家重点研发计划(2021YFB3502803)
安徽省自然科学基金(2108085ME141)
安徽省重点研发计划(202104a05020019)
出版年
2024
NETL
NSTL
万方数据