| 摘要 |
A method of healing surface-connected defects in castings by means of hot-isostatic pressing in a high-pressure furnace with a pressure medium in the form of a gas, wherein said casting is enclosed in an enclosure impenetrable to said pressure medium. The defective casting (10) is coated with a layer of a powdered material (16) which essentially retains its crystalline state in contact with both the casting and the glass enclosure in connection with the hot-isostatic pressing, whereupon a powdered glass or a material (15) forming glass upon heating is applied around the body. Then the coated casting and the glass powder are heated such that a dense coherent glass enclosure is formed which surrounds the casting before an isostatic pressure is applied outside said glass enclosure to act on the casting and remove defects present in the casting. After the hot-isostatic pressing, the powdered layer and the glass enclosure are removed from the casting which has been freed from surface-connected defects. |
