Cu/Al复合添加对烧结NdFeB抗腐蚀性及磁性的影响  

Effect of Cu/Al Compound Addition on Anti-Corrosive and Magnetic Properties of NdFeB Sintered Magnets

作　　者：倪俊杰[1] 邵鑫[1,2] 周书台 贾正锋[1,2] 王长征[1] 黄宝旭[1] 

机构地区：[1]聊城大学,山东聊城252000 [2]中国科学院兰州化学与物理研究所固体润滑国家重点实验室,甘肃兰州730000 [3]山东冠洲股份有限公司,山东冠县252500

出　　处：《稀有金属材料与工程》2013年第12期2536-2540,共5页Rare Metal Materials and Engineering

基　　金：聊城大学博士科研启动基金(31805);山东省自然科学基金(ZR2012EMM007;ZR2013EMM010);中科院兰州化物所固体润滑国家重点实验室开放课题(1110)

摘　　要：研究了Cu/Al复合添加对(Pr,Nd)12.8Dy1.0Febal Nb0.1B6.0(at%)烧结磁体抗腐蚀性和磁性的影响。结果表明:添加0.6 at%Al和0.2 at%Cu时磁体的抗腐蚀性最强,磁体在0.001 mol/L HCl溶液中的腐蚀电流密度从46.90μA·cm-2降低到11.14μA·cm-2,在湿热环境中腐蚀100 h的质量损失从13.2 mg·cm-2降低到0.4 mg·cm-2。抗腐蚀性的提高源于Cu和Al对富(Pr,Nd)晶界相化学稳定性的提高及其分布状况的改善。同时,Cu/Al对烧结NdFeB晶界结构的优化也有利于磁体磁性能的提高。Effects of Cu/A1 compound addition on the anti-corrosive and magnetic properties of （Pr, Nd）12.sDyl.0FebalNb0.1B6.o （at%） sintered magnets were investigated. It is found that the corrosion current density decreases from 46.90 μA·cm2 for the magnet without Cu/A1 to 11.14 μA·cm2 for the magnet with additions of 0.6 at% AI and 0.2 at% Cu in 0.001 mol/L HC1 solutions, the mass loss reduces from 13.2 mg.cm2 to 0.4 mg-cm2 in hot/humidity atmosphere for 100 h. The 0.6 at% A1- and 0.2 at% Cu-added magnet has the maximum corrosion resistance. The improvement of the corrosion resistance can be ascribed to the enhanced chemical stability and the optimized distribution of （Pr, Nd）-rich grain boundary phase. Additionally, the optical grain boundary microstructure is benefit for the magnetic properties.

关 键 词：烧结钕铁硼 腐蚀 磁性 组织结构 

分 类 号：TM273[一般工业技术—材料科学与工程]