摘要
为了改善烧结NdFeB的微观组织从而达到提升磁性能和抗腐蚀性能的目的,应用双合金工艺,采用直流电弧法制备Mg-Al合金纳米粉作为辅合金,将辅合金与主合金NdFeB粉混合后经烧结、热处理制备出NdFeB磁体。对添加前后磁体的微观组织、磁性能和耐蚀性能进行比较探究。结果表明:适量添加Mg-Al合金纳米粉改善了磁体的微观结构,从而提高了磁体磁性能。与未添加Mg-Al的磁体相比,添加0.2 wt%Mg-Al合金纳米粉时磁体综合磁性能最好,剩磁达到1.205 T,提升了1.6%;矫顽力达到929.8 kA/m,提升了4.5%;同时,磁体的抗腐蚀能力获得较大提升,添加0.3 wt%Mg-Al合金粉后磁体的腐蚀电流密度和腐蚀电位分别为45.11μA/cm^(2)和-0.806 V,相比于未添加的磁体分别下降了49.0%和提高了3.9%。这表明,适量Mg-Al合金纳米粉具有提升烧结NdFeB的磁性能和抗腐蚀性能潜力。
In order to improve the microstructure of sintered NdFeB and achieve the purpose of improving magnetic properties and corrosion resistance, Mg-Al alloy nanopowder was prepared by DC arc method as an auxiliary alloy by double alloy process. NdFeB magnets were prepared by sintering and heat treatment after mixing the auxiliary alloy with the main alloy NdFeB powder. The microstructure, magnetic properties and corrosion resistance of the magnets before and after addition were compared. The results show that the appropriate addition of Mg-Al alloy nanopowder improves the microstructure of the magnet, thereby improving the magnetic properties of the magnet. Compared with the magnet without Mg-Al addition, the comprehensive magnetic properties of the magnet with 0.2 wt% Mg-Al nanopowder are the best, and the remanence reaches 1.205 T, which is increased by 1.6 %. The coercivity reaches 929.8 kA/m, which is increased by 4.5 %. At the same time, the corrosion resistance of the magnet was greatly improved. After adding 0.3 wt% Mg-Al alloy powder, the corrosion current density and corrosion potential of the magnet were 45.11 μA/cm^(2) and-0.806 V, respectively,which decreased by 49.0 % and increased by 3.9 % compared with the magnet without addition. This shows that an appropriate amount of Mg-Al alloy nanopowder has the potential to improve the magnetic properties and corrosion resistance of sintered NdFeB.
作者
张超超
李志杰
朱琳
于成龙
陈潇
修先毅
ZHANG Chao-chao;LI Zhi-jie;ZHU Lin;YU Cheng-long;CHEN Xiao;XIU Xian-yi(School of Science,Shenyang University of Technology,Shenyang 110870,China;Liaoning Provincial Key Laboratory of Composite Metal Nanomaterials and Magnetic Technology,Shenyang 110870,China;Fushun Dongyu Magnetic Materials Co,Ltd,Fushun 113001,China)
出处
《磁性材料及器件》
2025年第1期1-7,共7页
Journal of Magnetic Materials and Devices
基金
辽宁省-沈阳材料科学国家研究中心联合研发基金项目(2019JH3/30100019)。
