| 简介 |
PROBLEM TO BE SOLVED : To provide a method of producing a rare earth sintered magnet capable of reducing warping deformation of a molded body caused by sintering compared to the conventional technology without complicating a device configuration of a sintering furnace.SOLUTION : A rare earth magnet material molded body 5 is arranged in an inner part simply enclosed by sandwiching a spacer 4 by a bottom part sintering plate 2a and an upper part sintering plate 2b, and is sintered, and is liquefied at a temperature of 800°C or more, and especially neodymium (Nd) seeps to a front layer, and gasified neodymium stays in a space contacting with a surface of the rare earth magnet material molded body 5. Accordingly, a total amount of the gasified neodymium is reduced. A predetermined space is provided between the upper part sintering plate 2b and the rare earth magnet material molded body 5, and a mesh 3 is disposed under the rare earth magnet material molded body 5, and therefore, almost a same amount of neodymium is gasified from both of an upper surface and a lower surface of the rare earth magnet material molded body 5, and density difference between an upper part and a lower part (the front and back) of the rare earth magnet material molded body 5 is reduced, and warping deformation in a sintering process is suppressed. |
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