| 摘要 |
PURPOSE:To restrain the development of defect in degreasing stage by executing the ordinary degreasing treatment after executing pre-treatment of degrease by means of vaporizing and removing organic binder without boiling under a reduced pressure. CONSTITUTION:Raw material powder and the organic binder are heated and kneaded at 50 : 50 - 60 : 40vol. ratio to make the raw material for forming and to obtain the formed body with injection-molding. Successively, a part or the whole of the organic binder is removed from this formed body to obtain the degreased body. This degreased body is sintered under heating atmosphere to manufacture a sintered body. In the stage for obtaining the degreased body in this method, the formed body is heated at temp. under reducing pressure atmosphere of <=10torr, in which vapor pressure of the component having the max. vapor pressure among the components of the organic binder is less than the atmospheric pressure. Therefore, by the pre-treatment of degrease for removing >=18wt.% of the organic binder and successively, the heating degrease for sufficiently executing heating-degrease, the degrease of the injection-molded body can be executed. |
