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烧结Nd-Fe-B磁体晶界扩散TbH2高温稳定性及其机理
引用本文:潘为茂,刘仁辉,周头军,屈鹏鹏,陶力,陈久昌,邱建民,钟震晨.烧结Nd-Fe-B磁体晶界扩散TbH2高温稳定性及其机理[J].有色金属科学与工程,2020,11(3):109-114.
作者姓名:潘为茂  刘仁辉  周头军  屈鹏鹏  陶力  陈久昌  邱建民  钟震晨
作者单位:1a.江西理工大学,材料冶金化学学部,江西 赣州 341000
基金项目:国家自然科学基金;江西省重点研发计划资助项目
摘    要:采用涂敷方式,在烧结钕铁硼表面均匀涂敷TbH2粉末,经过不同的扩散温度处理,制备出晶界扩散磁体。研究了晶界扩散TbH2对烧结Nd-Fe-B磁体常温磁性能及高温稳定性的影响,并分析了磁体矫顽力提升的机理。常温磁性能研究表明,扩散磁体经过890 ℃+490 ℃工艺处理后性能达到最优,矫顽力从1 383 kA/m提升到1 988 kA/m。高温磁性能结果显示,扩散磁体200 ℃的矫顽力温度系数|β|比原始磁体降低0.032%/℃,磁通不可损失hirr比原始磁体降低21.47%,扩散TbH2明显提高了烧结Nd-Fe-B磁体的热稳定性。分析得出,晶界扩散TbH2磁体矫顽力提升的机理是Nd2Fe14B晶粒外延层形成了(Tb, Nd)2Fe14B核壳结构,提高了磁晶各向异性场;同时改善了磁体的微观组织结构,有效地隔绝了晶粒之间的磁交换耦合作用。 

关 键 词:烧结钕铁硼    晶界扩散    磁通不可逆损失    矫顽力提升机理
收稿时间:2020-03-27

Study on the high-temperature stability and mechanism of sintered Nd-Fe-B magnet by the grain boundary diffusion of TbH2
Affiliation:1a.Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China1b.Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices, Jiangxi University of Science and Technology, Ganzhou 341000, China2.Ganzhou Jiatong New Material Co., Ltd., Ganzhou 341000, China
Abstract:The Nd-Fe-B magnet was prepared by the grain boundary diffusion process in which TbH2 power was evenly coated on the surface of Nd-Fe-B and then diffused at different temperatures in the ground boundary of Nd-Fe-B. The effects of the diffusion of TbH2 power in the grain boundary of Nd-Fe-B magnet on the magnetic properties at room temperature and thermal stability at high temperature were investigated, and the mechanism of coercivity enhancement was analyzed. The study of magnetic properties at room temperature showed that the performance of the magnet reached the best after 890 ℃+490 ℃ process and its coercivity increased from 1 383 kA/m to 1 988 kA/m. The study of high-temperature magnetic performance showed that the temperature coefficient of coercivity |β| of the magnet at 200 ℃ was reduced by 0.032% /℃ and the irreversible loss of magnetic flux (hirr) was reduced by 21.47% compared with the original one, and the thermal stability of sintered Nd-Fe-B magnet was significantly increased. Through analysis, it can be concluded that the mechanism of coercivity enhancement of the magnet caused by the diffusion of TbH2 powder in its grain boundary lies in that the epitaxial layer of Nd2Fe14B grain forms a (Tb, Nd)2Fe14B core-shell structure which enhances the magnetocrystalline anisotropy field and that the microstructure of the magnet is improved so that the magnetic exchange coupling between the grains is effectively avoided. 
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