| 摘要 |
The objective of the present invention is to provide a method for making a NdFeB sintered magnet without an occurrence of a curve or deformation, by using a mold which is inexpensive, easy to be machined, and will not be embrittled. The present invention also provides such a mold. In the present invention, at least a part (e.g. a bottom plate 11) in the mold is made of a carbon material. This enables a production of a NdFeB sintered magnet without an occurrence of a curve or deformation caused by a friction due to a sintering shrinkage, because the friction between a carbon material and a sintered compact in a sintering process is lower than that between metal and a sintered compact. What is more, a carbon material is advantageous in that it is inexpensive, easy to be machined, and will not be embrittled even after repeated uses of the mold. Such effects can be particularly obtained by using a carbon material as the bottom plate 11, which is subjected to the load of the sintered compact in the sintering process. |
