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

摘要:

研究了Cu/Al复合添加对(Pr, Nd)12.8Dy1.0FebalNb0.1B6.0 (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46.90 μA·cm-2降低到11.14 μA·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

Abstract:

Effects of Cu/Al compound addition on the anti-corrosive and magnetic properties of (Pr, Nd)12.8Dy1.0FebalNb0.1B6.0 (at%) sintered magnets were investigated. It is found that the corrosion current density decreases from 46.90 μA·cm-2 for the magnet without Cu/Al to 11.14 μA·cm-2 for the magnet with additions of 0.6 at% Al and 0.2 at% Cu in 0.001 mol/L HCl solutions, the mass loss reduces from 13.2 mg·cm-2 to 0.4 mg·cm-2 in hot/humidity atmosphere for 100 h. The 0.6 at% Al- 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