| 摘要 |
Method of manufacturing an object of powdered material by isostatic pressing of a body (10), preformed from the powdered material, whereby the preformed body is surrounded by a casing (16) which at least for the main part is transferred to molten phase, before the isostatic pressing is carried out while sintering the powder. As material in the casing there is used glass or a material forming glass when being heated and containing 48-52 per cent by weight B2O3, 46-50 per cent by weight SiO2 and 1.5-2.5 per cent by weight Al2O3. It can be removed from the finished object by water or water vapour and has a low coefficient of thermal expansion at temperatures below the melting temperature of the glass. To counteract the penetration of molten glass from the casing into the preformed body, a barrier layer (18) may be arranged on the preformed body inside the casing. |
