RFeB SYSTEM MAGNET PRODUCTION METHOD, RFeB SYSTEM MAGNET, AND COATING MATERIAL FOR GRAIN BOUNDARY DIFFUSION TREATMENT

摘要

A method for producing an RFeB system magnet with high coercivity by preventing a coating material from peeling off the surface of a base material during a grain boundary diffusion treatment is provided. A method for producing an RL2Fe14B system magnet which is a sintered magnet or a hot-deformed magnet containing, as the main rare-earth element, a light rare-earth element RL which is at least one of the two elements of Nd and Pr, the method including: applying, to a surface of a base material M of the RL2Fe14B system magnet, a coating material prepared by mixing a silicone grease and an RH-containing powder containing a heavy rare-earth element RH composed of at least one element selected from the group of Dy, Tb and Ho; and heating the base material together with the coating material. Improved coating and base materials adhesion facilitates transfer of RH into base material grain boundaries.

主权项

1. An RFeB system magnet production method for producing an RL2Fe14B system magnet which is a sintered magnet or a hot-deformed magnet containing, as a main rare-earth element, a light rare-earth element RL which is at least one of two elements of Nd and Pr, the method comprising steps of:
applying, to a surface of a base material of the RL2Fe14B system magnet, a coating material prepared by mixing a silicone grease and an RH-containing powder containing a heavy rare-earth element RH composed of at least one element selected from a group of Dy, Tb and Ho; and heating the base material together with the coating material.