| 简介 |
FIELD : metallurgy.SUBSTANCE : method involves the preparation of a refractory slurry, the layered formation of refractory layers from it on the model, the removal of the model, the drying of the ceramic mould, its impregnation, re-drying and firing. After firing, a waterproof organic film former is applied to the outer surface of the ceramic mould. On the inside, the mould is impregnated with a hydrosol containing at least one oxygen-containing compound with an element selected from the group : rare earth metal, hafnium, zirconium and aluminium. Impregnation is carried out at least twice with intermediate drying.EFFECT : consolidation of the face layer of ceramic forms, increase of chemical inertness of ceramic forms to melts of high-temperature alloys, refractory and chemically active alloys, increase of mechanical strength.4 cl, 6 ex |
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