| 摘要 |
PROBLEM TO BE SOLVED: To improve the uniformity of the shrinkage of a molded body and make the shape of the product after sintering close to the set value as much as possible by optimizing heating treatment for the molded body. SOLUTION: A molding material contg. the powder of a metallic material and a binder contg. a thermoplastic resin is subjected to injection molding to obtain a green molded body. By subjecting this green molded body to heating treatment, the binder is removed from the green molded body, and the metallic material powder is sintered. This heating treatment contains a primary stage (to the time T6) for removing the binder and a secondary stage (on and after the time T6) for sintering the metallic material powder, and, in the secondary stage, rapid heating is executed at the time of T6 to T7 at a temp. rising rate of >=8 deg.C/min. The temp. rising rate in the primary stage is <=3 deg.C/min.
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