| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an Fe-B-Ra permanent magnet having stabilized high magnet characteristics and exhibiting excellent adhesion to an underlying Fe-B-Ra permanent magnet in which elution of magnet surface is prevented and deterioration from initial magnet characteristics is minimized when the magnet is left, as it is, for a long time under atmospheric conditions of 80°C and 90% relative humidity. SOLUTION: An Fe-B-Ra permanent magnet body is immersed into or sprayed with tin alkoxide compound solution and then the surface of the magnet body is dried. Subsequently, it is heat treated at 200°C-450°C for 30 min to 10 hours and coated with epoxy resin, thermosetting acrylic resin, or the like, by spraying, immersion, or the like, and baked by a well known baking method thus setting the thickness of coating at 25μm or less. According to the method, the magnet characteristics do not deteriorate substantially after the magnet is left, as it is, for 1000 hours under conditions of 80°C and 90% relative humidity. COPYRIGHT: (C)2003,JPO
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