CORROSION-RESISTING PERMANENT MAGNET AND METHOD FOR PRODUCING THE SAME

摘要

An Fe-B-R permanent magnet has an excellent adhesion to an Fe-B-R permanent magnet, stable high magnet characteristics, improved abrasive and corrosion resistances, and an excellent electrical insulation. Especially, the initial magnetic characteristics hardly deteriorate even if it is left for a long time in an environment of a temperature of 80 DEG C and a relative humidity of 90 %. To produce such an Fe-B-R magnet, the surface of a magnet blank is cleaned by ion sputtering, an Al or Ti film is formed on the cleaned magnetic blank by vapor phase film-forming, such as ion plating, an aluminum oxide film is formed on the Al or Ti film by vapor phase film-forming, such as ion plating, while introducing O2 simple substance gas or an O2-containing gas. Thus, the adhesion of the deposited film is significantly improved by the aluminum oxide film, and an excellent corrosion resistance is achieved, thereby providing an Fe-B-R permanent magnet having stable magnet characteristics thanks to the corrosion and abrasive resistances and electrical insulation of the deposited corrosion-resisting metal film.