CORROSION RESISTANT RARE EARTH MAGNETS AND MAKING METHODS

摘要

A CORROSION RESISTANT RARE EARTH MAGNET IS OBTAINED BY (i) APPLYING A TREATING LIQUID COMPRISING A FLAKY FINE POWDER AND A METAL SOL TO A SURFACE OF R-T-M-B RARE EARTH PERMANENT AND THEN HEATING TO FORM A COMPOSITE FILM OF FLAKY FINE POWDER/METAL OXIDE ON THE MAGNET SURFACE; (ii) APPLYING A TREATING LIQUID COMPRISING A FLAKY FINE POWDER AND A SILANE AND/OR A PARTIAL HYDROLYZATE THEREOF TO A SURFACE OF R-T-M-B RARE EARTH PERMANENT MAGNET AND THEN HEATING A FLAKY FINE POWDER/SILANE AND/OR PARTIALLY HYDROLYZED SILANE COATING TO FORM A THERMAL COMPOSITE FILM ON THE MAGNET SURFACE; OR (iii) APPLYING A TREATING LIQUID COMPRISING A FLAKY FINE POWDER AND AN ALKANE SILICATE TO A SURFACE OF R-T-M-B RARE EARTH PERMANENT MAGNET AND THEN HEATING TO FORM A COMPOSITE FILM OF FLAKY FINE POWDER/ALKALI SILICATE GLASS ON THE MAGNET SURFACE.