Ho基合金纳米粉晶界添加对Nd-Fe-B性能的影响  

Effect of Ho-based Nanopowder Intergranular Addition on the Performance of Nd-Fe-B

作　　者：王馨月 李志杰[1] 王福春 郑阳阳 李仁俊 包立夫[1] WANG Xin-yue;LI Zhi-jie;WANG Fu-chun;ZHENG Yang-yang;LI Ren-jun;BAO Li-fu(School of Science,Shenyang University of Technology,Shenyang Liaoning 110870,China)

机构地区：[1]沈阳工业大学理学院,辽宁沈阳110870

出　　处：《辽宁化工》2022年第12期1669-1673,1681,共6页Liaoning Chemical Industry

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(项目编号:2019JH3/30100019)。

摘　　要：为了减少重稀土用量和提高Nd-Fe-B的抗腐蚀性能,采用直流电弧法制备Ho-Al合金纳米粉,通过晶界添加法改善烧结Nd-Fe-B的抗腐蚀性能。运用扫描电镜、透射电镜、X射线衍射仪、震动样品磁强计、电化学工作站、恒温恒湿箱等仪器对样品进行表征和性能测试。结果表明:将腐蚀电位为-1.149 V的Ho_(7)Al_(3)合金纳米粉晶界添加至烧结Nd-Fe-B中,导致磁体腐蚀速度减慢,添加质量分数0.2%的Ho-Al时烧结Nd-Fe-B抗蚀性最优异,其腐蚀电流密度为1.112×10^(-4) A·cm^(-2)。经过腐蚀96 h失重量为3.9 mg·cm^(-2),是未添加的30.7%,同时磁性能有一定增加。这说明添加Ho_(7)Al_(3)合金纳米粉对Nd-Fe-B防腐性能的提高有重要作用。In order to reduce the dosage of heavy rare earth and improve the corrosion resistance of sintered Nd-Fe-B,Ho-Al alloy nanopowder were prepared by DC arc method,and the corrosion resistance of sintered Nd-Fe-B was improved by grain boundary addition method.The samples were characterized and tested by SEM,TEM,XRD,VSM,electrochemical workstation,constant temperature and humidity chamber.The results showed that the grain boundary addition of Ho_(7)Al_(3) alloy nanopowder with a corrosion potential of-1.149 V to sintered Nd-Fe-B resulted in a slower magnet corrosion rate,and the sintered Nd-Fe-B with 0.2%Ho-Al addition had the best corrosion resistance with a corrosion current density of 1.112×10^(-4) A·cm^(-2).The weight loss of Nd-Fe-B was 3.9 mg·cm^(-2) after 96 h corrosion,which was 30.7%of that without additive,meanwhile the magnetic properties changed little,which indicated that the addition of Ho_(7)Al_(3) alloy nanopowder played an important role in improving the anti-corrosion performance of Nd-Fe-B.

关 键 词：Ho-Al合金纳米粉 烧结ND-FE-B 晶界添加 直流电弧法 电化学腐蚀 

分 类 号：TQ050.4[化学工程]