| 摘要 |
PURPOSE: To obtain a good quality ingot without any fear of the development of defect of pin hole, etc., in the case of producing an aluminum plate, etc., by forming mixed material of inorganic fiber, organic fiber and inorganic binder containing no shot to the shape corresponding to a molten metal pouring hole. CONSTITUTION: The suitable amount of water is added to the mixed material of e.g. carbon fiber, organic fiber and inorganic binder to make slurry. This slurry is dehydrated and formed with a vacuum sucking and forming method so as to correspond to the shape of the molten metal pouring hole in a molten metal furnace and heated and dried to manufacture a stopper for molten metal pouring hole. The durability can further be improved by coating colloidal smectite on the surface of this stopper, particularly on the inside surface directly contacting with the molten metal. Since the shot causing to the mixing of foreign matter in the molten metal, is not contained in the raw material of this stopper, the defect of the pin hole, etc., in the product is not developed. |
