晶界添加Pr-Cu合金纳米粉对烧结NdFeB磁性能及耐腐蚀性能的影响  

Effect of Adding Pr-Cu Alloy Nano-powder at Grain Boundary on Magnetic Properties and Corrosion Resistance of Sintered NdFeB

作　　者：李仁俊 李志杰[1] 郑阳阳 张洪伟 LI Renjun;LI Zhijie;ZHENG Yangyang;ZHANG Hongwei(School of Science,Shengyang University of Technology,Shengyang 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》2024年第5期657-662,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(项目编号:2019010258-JH3/301)。

摘　　要：为了提升Nd FeB磁体的磁性能及耐腐蚀性能,首先用等离子体直流电弧法得到Pr-Cu合金纳米粉,再用双元合金法即晶界添加Pr-Cu合金纳米粉得到高性能烧结NdFeB磁体。借助X射线衍射仪(XRD)、扫描电子显微镜(SEM)、振动样品磁强计(VSM)和电化学工作站、恒温恒湿箱表征了磁体微观结构、磁性能及耐腐蚀性能。结果表明,添加质量分数0.6%Pr-Cu合金纳米粉时,磁体的矫顽力由959.1 kA/m增加到1 080.5 kA/m,提高了12.6%;剩磁则由1.24 T下降至1.13 T,下降了9.1%。此外,磁体的耐腐蚀性能明显提高,磁体的腐蚀电流密度由62.0m A/cm^(2)下降至22.0m A/cm^(2);在0.2MPa、120℃、100%相对湿度下进行失重腐蚀实验96h后磁体的质量损失为4.5mg/cm^(2),仅为未添加时的26.5%。适量添加Pr-Cu合金纳米粉改善烧结NdFeB磁体的性能是可行的。In order to improve the magnetic properties and corrosion resistance of NdFeB magnet,Pr-Cu alloy nano-powders were firstly obtained by plasma arc method,and then high performance sintered NdFeB magnets were obtained by the binary alloy method.The microstructure,magnetic properties and corrosion resistance of magnets were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM),vibrating sample magnetometer(VSM),electrochemical workstation,and constant temperature and humidity box.The results showed that the coercivity of the magnet increased from 959.1 kA·m^(-1) to 1080.5 kA·m^(-1) by 12.6%when mass fraction 0.6%Pr-Cu alloy powder was added.The remanence decreased by 9.1%from 1.24 T to 1.13 T.In addition,the corrosion resistance of magnets was obviously improved,and the corrosion current density of magnets decreased from 62.0 mA·cm^(-2) to 22.0 mA·cm^(-2).The mass loss of the magnet was 4.5 mg·cm^(-2) after 96 h of the weightless corrosion experiment at 0.2 MPa,120℃and 100%relative humidity,which was only 26.5%of that without addition.It is feasible to improve the properties of sintered NdFeB magnets by adding Pr-Cu alloy nano-powder.

关 键 词：烧结NDFEB Pr-Cu合金纳米粉 磁性能 耐腐蚀性能 

分 类 号：TQ050.4[化学工程]