Leaching of ceramic materials

Metal founding – Process – Shaping liquid metal against a forming surface

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Details

134 2, 134 3, 134 21, 134 221, 134 2217, B22D 2900

Patent

active

053320239

ABSTRACT:
The article together with the alumina core in situ is placed in a sealable vessel containing a concentrated aqueous potassium hydroxide leaching liquor at a temperature immediately below its normal atmospheric boiling point. The vessel is sealed and the pressure within the vessel is reduced to less than atmospheric pressure so as to induce boiling and agitation of the leaching liquor within the passage in the article. The pressure in the vessel is raised to atmospheric pressure and finally spent leaching liquor together with leached alumina core is removed from within the article.

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patent: 3694264 (1972-09-01), Weinland et al.
patent: 4043377 (1977-08-01), Mazdiyasni
patent: 4073662 (1978-02-01), Borom
patent: 4102689 (1978-07-01), Borom
patent: 4134777 (1979-01-01), Borom
patent: 4141781 (1979-02-01), Greskovich et al.
patent: 4552198 (1985-11-01), Mills et al.

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