| 摘要 |
PURPOSE:To eliminate the separation of a coating film, by a method wherein, at the initial stage when an oxidation-resistant metal protective layer is evaporated on the surface of a specified rare earth sintered magnet body, the evaporation surface is irradiated with a laser beam, and a mixed layer of a specified rare earth and metal is formed on the interface between the magnet body and the protective layer. CONSTITUTION:On the surface of an R-Fe-B based rare earth magnet body(R is a combination of one or more kinds of rare earth elements containing Y), metal such as Ni and Al is deposited by an evaporation method, and an oxidation resistant protective layer is formed. At the initial stage of the evaporation, the surface of the deposited metal is irradiated with a laser beam, thereby forming a mixed layer or R-Fe-B and metal on the interface between the magnet body and the protective layer. Since the mixed layer existe, the adhesion of the magnet body surface and the metal coating film is increased. At the time of laser irradiation, laser energy may be so controlled that the layer is fured to the depth of, e.g. about 100nm from the surface. Hence the separation of the coating film can be eliminated. |
