| 摘要 |
PURPOSE:To provide a low-priced surface treatment method for a rare earth- cobalt magnet alloy generating less cracks and chippings by a method wherein the surface layer of the surface to be ground of a ground rare earth-cobalt permanent alloy, is oxidated. CONSTITUTION:A surface layer of the surface to be grown of a ground rare earth-cobalt magnet alloy is subjected to an oxidation treatment. The oxidation is conducted by a heat treatment in a vacuum atmosphere at 200 to 900 deg.C, or a heat treatment in an argon and nitrogen gas atmosphere at 200 to 850 deg.C, or a heat treatment in the atmosphere of 150 to 250 deg.C. As a result, a rare earth- cobalt magnet alloy, having less cracks and chippings and the advantage such as fine surface roughness, can be obtained. Also, the yield of production on the assembly line of the magnet can be improved, and the reliability and the like can also be improved. |
