| 摘要 |
PURPOSE:To obtain a porous metallic body having reduced pore sizes by packing powder of an easily water-soluble salt having a specific grain size into a dies, sintering the powder, forcing a molten metal into the sintered body, washing away the easy water soluble salt and compressing the resultant porous metallic body. CONSTITUTION:Powder of an easily water-soluble salt such as sodium chloride or the like having 10-150mu grain size is packed into dies at the packing ranging about 50-70. The dies are heated to sinter the easily water-soluble salt powder and to bring the respective powder particles into face-to-face contact thus providing about 15-50% porosity. Such sintered body of the easily water-soluble salt is preheated and a metal having the m.p. lower than the easily water-soluble salt (Sn, Zn, etc.) is forced in a molten state under about >=30kg/cm<2> into the sintered body. The easily water-soluble salt is washed away with water upon cooling and solidifying of the molten metal to obtain a porous metallic body. The porous metallic body is dried and is then uniformly compressed under 100- 500kg/cm<2> pressure by a mechanical or hydrostatic means. The porous metallic body useful for production of a printing body, etc. is thus obtd.
|
