| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of a conventional method that an expensive large-scale magnetic-field molding machine is necessary, a die life is short, a large amount of expensive Dy is used which is small in absolute magnitude on the earth, and treatment for preventing a surface from being oxidized and from forming rust is necessary. SOLUTION: This production method includes steps for: charging a molded workpiece in a molding die of a magnetic-field molding machine which utilizes a magnetic attractive force; and temporarily baking the workpiece. Then, the method does not need to consider mechanical strength, does not need to charge adhesives, accordingly can align directions of easy axes of magnetization, and can produce a high-performance magnet at a low cost. In addition, the molding die is not used at a high temperature in a sintering process, and has the long life and an economical advantage, because the workpiece is temporarily baked at a low temperature and the temporarily baked workpiece is immediately taken out of the die so as not to be exposed to the high temperature. Furthermore, the method includes steps for using Al, Ni, Co, an alloy or the like together with the expensive Dy, and simultaneously alloying them with the temporarily-baked workpiece in a full-sintering step to improve magnetic performance and conduct rust prevention treatment. Accordingly, the method can omit a vapor deposition process or a plating process thus increasing an economical effect. COPYRIGHT: (C)2008,JPO&INPIT
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