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

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的重铬酸盐钝化－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府ＮｄＦｅＢ磁粉制成粘结ＮｄＦｅＢ磁体的磁性能，结果表明上述工艺方法的均能改善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

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

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.