| 摘要 |
A method of improving the removal of an investment casting shell surrounding a metallic article. The shell is made from the deposit of layers refractory slurry and stucco onto a pattern. The shell contains, after firing, an amount of an alkali metal oxide or an alkaline earth metal oxide sufficient to reduce the strength of the shell. By this invention, after firing of the shell and pouring of the molten metallic part into the shell, the shell is hydrated to further reduce the strength of the shell, to facilitate its removal from the metallic part.
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