AlO添加量对烧结磁体微观结构和密度的影响-有色金属工程.DOC

doi：10.3969/j.issn.2095-1744.2016.06.001 Al2O3粉体对烧结钕铁硼磁性能的影响 （1.江西理工大学 冶金与化学工程学院，江西 赣州 341000；2.赣州市东磁稀土有限公司，江西 赣州 341000） 摘 要：研究了在磁体制备过程中添加Al2O3粉体对(PrNd)31(AlCoCuGaZr)1.55B0.98Fe合金磁性能的影响。结果表明，Al2O3粉末添加量的增加，磁体密度矫顽力都呈先上升后下降趋势剩磁与最大磁能积缓慢下降。Al2O3添加0.1%时磁体密度提升0.01 gcm3，继续添加密度开始下降；当添加0.2%磁体矫顽力显著提升提高5%，综合磁性能最佳。显微组织表明，适量添加Al2O3，能促进磁体致密化。Al2O3/RE2O3能够钉扎晶界，细化晶粒，使晶粒尺寸均匀，。 关键词：Al2O3；钕铁硼；矫顽力；微观组织 中图分类号：TG132.2；TM273 文献标识码：A 文章编号：2095-1744（2016）06-0001-06 Influence of Al2O3 Powder Addition on Microstructure and Magnetic Properties of Sintered Nd-Fe-B Magnets CHEN Jinqing1, DUAN Min1, WU Meihao2, LI Longgui2, HUANG Yaxiang1, HUANG Bin1, HUANG Chao1 (1. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000,China; 2 Ganzhou Dongci Rare Earth Co.Ltd, Ganzhou, Jiangxi 341000,China) Abstract: Influences of Al2O3 addition in the grain boundary on the microstructure and magnetic properties of (PrNd)31(AlCoCuGaZr)1.55B0.98Febal alloy was studied. The results show that the density and coercivity of the magnets increased at the beginning and then decreased within the increasing Al2O3 addition, can radiate downward trend after a first rise, however Br and (BH)max slowly declined. When the amount of Al2O3 was 0.1%, the density was improved 0.01g/cm3. It is found that the coercivity of magnet significantly increased (increasing by 5%) with 0.2% Al2O3 addition, and the comprehensive magnetic properties were best. Microstructure observations showed that adding Al2O3 on the grain boundaries could decrease the grain size, optimize the microstructure, and promote the densification of the magnet. In addition, Al2O3/ RE2O3 existing on the grain boundaries could pin grain boundaries and refine grain to increases the coercivity of magnet. Key word: Al2O3 addition; Nd-Fe-B magnet; coercivity; microstructure; magnetic properties 自1983年S等人制备出烧结钕铁硼永磁材料(S-NdFeB)以来，钕铁硼因其优越的综合磁性能已被广泛应用于国防军工、国民经济生活等各种领域[]。目前，工业上已能生产出剩磁、磁能积皆达到理论值90%的磁体，但其最高矫顽力仅有理论值的