Ceramic foam filter
AssigneeSwiss Aluminium Ltd.
InventorsMichael J. Pryor, Thomas J. Gray
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Abstract
The present invention resides in an improved, high temperature resistant ceramic foam filter particularly useful for filtering molten metal, and also an aqueous slurry for use in preparing same.
Claims12
A high temperature resistant ceramic foam filter for use in filtering molten metal having an open cell structure characterized by a plurality of interconnected voids surrounded by a web of said ceramic, said filter having a density of less than 30% of the theoretical density for ceramic material of the same size, said foam having the followig composition:
- 40 to 95% Al.sub.2 O.sub.3 ;
- 1 to 25% Cr .sub.2 O.sub.3 ;
- 0.1 to 12% bentonite;
- and 2.5 to 25% of an air setting agent which is substantially nonreactive to the molten metal.
An aqueous slurry for use in preparing a high temperature resistant ceramic foam having the following composition:
- 40 to 95% Al.sub.2 O.sub.3 ;
- 1 to 25% Cr.sub.2 O.sub.3 ;
- 0.1 to 12% bentonite;
- and 2.5 to 25% of an air setting agent which is substantially nonreactive to the molten metal.
Dependencies are inferred from the claim text.