不同表面处理工艺对快淬NdFeB永磁粉抗氧化性和磁性能影响  

The Effect of Different Surface Treatment Processes on the Oxidation Resistance and Magnetic Properties of Rapidly Quenching Nd-Fe-B Magnetic Powder

作　　者：刘颖[1] 陈悦[1] 涂铭旌[1] 

机构地区：[1]四川大学金属材料系

出　　处：《功能材料》1999年第3期252-253,共2页Journal of Functional Materials

摘　　要：本文对快淬ＮｄＦｅＢ永磁粉分别采用化学镀镍、重铬酸盐钝化处理、重铬酸盐钝化还原处理以及硅烷偶联处理和重铬酸盐钝化－还原／硅烷复合处理等工艺进行了表面包覆，研究了表面包覆处理前后的快淬ＮｄＦｅＢ磁粉的抗氧化特性，并初步比较了包覆处理前后的快淬ＮｄＦｅＢ磁粉制成粘结ＮｄＦｅＢ磁体的磁性能。结果表明上述工艺方法均能改善ＮｄＦｅＢ磁粉的抗氧化性，其中以重铬酸盐钝化－还原／硅烷偶联处理形成的包覆层的抗氧化性最佳；但它们对粘结ＮｄＦｅＢ磁体的磁性能影响却不一致；Ｎｉ－Ｐ合金包覆层会使粘结ＮｄＦｅＢ磁体的磁性能稍微减小，重铬酸盐钝化膜、重铬酸盐钝化－还原处理形成的钝化膜会基本不影响粘结ＮｄＦｅＢ磁体的磁性，而硅烷处理以及重铬酸盐钝化－还原硅烷处理相复合获得的包覆层会提高粘结ＮｄＦｅＢ的磁性能。This paper presents the oxidation resistance of rapidly quenching NdFeB before and after the surface treatment by the electroless nickel,dichromat passivating treatment,dichromat passivating and reducing treatment,silane aging treatment,dichromate passivating and reducing and silane aging compound treatment,and the magnetic properties of their bonded NdFeB permanent magnet are compared.The results show that all the method of processes can improve the oxidation resistance of rapidly quenching NdFeB magnetic powder,especially the oxidation resistance of rapidly quenching with the coating by the dichromate passivating and reducing and silane aging compound treatment. But their effects on magnetic properties of bonded NdFeB magnet are different.The electroless of Ni-P alloy reduce the magnetic properties of bonded NdFeB magnet,the dichromat passivating treatment, the dichromat passivating and reducing treatment have the magnetic properties of bonded NdFeB magnet changed little,the silane aging treatment, the dichromate passivating and reducing and silane compound treatment can improve magnetic properties of bonded NdFeB magnet.

关 键 词：快淬 永磁粉 表面处理 抗氧化性 磁性能 

分 类 号：TM273.014[一般工业技术—材料科学与工程] TM273.051[电气工程—电工理论与新技术]