Al_(2)O_(3)掺杂对烧结钕铁硼磁体电阻率和磁性能的影响  

Effect of Al_(2)O_(3)doping on resistivity and magnetic properties of sintered NdFeB magnets

作　　者：张梦成 冯泉妤 刘友好 刘家琴 吴玉程 ZHANG Meng-cheng;FENG Quan-yu;LIU You-hao;LIU Jia-qin;WU Yu-cheng(Institute of Industry and Equipment Technology,Engineering Research Center of Advanced Composite Materials Design&Application of Anhui Province,Hefei University of Technology,Hefei 230009,China;State Key Laboratory of Rare Earth Permanent Magnet Materials,Anhui Dadi Bear New Materials Co Ltd,Hefei 231500,China)

机构地区：[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

出　　处：《材料热处理学报》2024年第4期95-102,共8页Transactions of Materials and Heat Treatment

基　　金：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);安徽省重点研究与开发计划项目(202104a05020019)。

摘　　要：采用晶间掺杂法在钕铁硼合金粉体中掺入Al_(2)O_(3),制备了Al_(2)O_(3)掺杂的烧结钕铁硼磁体,研究了Al_(2)O_(3)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Al_(2)O_(3)掺杂量的增加逐步提高,由未掺杂时的125.2μΩ·cm提高到Al_(2)O_(3)掺杂量为0.5 mass%时的144.4μΩ·cm,提高了15.3%;磁体矫顽力随着Al_(2)O_(3)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Al_(2)O_(3)掺杂量为0.3 mass%时,矫顽力达到最大值14.97 kOe,继续增加Al_(2)O_(3)掺杂量,磁体矫顽力开始下降;剩磁随着Al_(2)O_(3)掺杂量的增加逐步降低,由未掺杂时的13.97 kGs下降到Al_(2)O_(3)掺杂量为0.5 mass%时的12.69 kGs。掺杂适量的Al_(2)O_(3)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。Al_(2)O_(3)-doped sintered NdFeB magnets were prepared by intergranular doping of Al_(2)O_(3)into NdFeB alloy powder.Effect of Al_(2)O_(3)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 Al_(2)O_(3)doping content,from 125.2μΩ·cm without dopiong to 144.4μΩ·cm when the Al_(2)O_(3)doping content is 0.5 mass%,increasing by 15.3%.The coercivity of the magnets increases first and then decreases with the increase of Al_(2)O_(3)doping content.The coercivity of the undoped magnet is 13.28 kOe,and when the Al_(2)O_(3)doping content is 0.3 mass%,the coercivity reaches its maximum value of 14.97 kOe.Continuing to increase the Al_(2)O_(3)doping content,the coercivity of the magnets begins to decreases.The magnet remanence gradually decreases with the increase of Al_(2)O_(3)doping content,from 13.97 kGs without doping to 12.69 kGs when the Al_(2)O_(3)doping content is 0.5 mass%.An appropriate content of Al_(2)O_(3)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 Al_(2)O_(3) 电阻率 晶间掺杂 矫顽力 

分 类 号：TM273[一般工业技术—材料科学与工程]