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US 6,663,776 B2Granted
High strength SiC filter and method for the manufacture thereof
AssigneeSelee Corporation
InventorsWilliam Isaac Hoffman, Rudolph A. Olson, III
Life of this patent
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Abstract
There is provided an improved ceramic foam filter for use in filtering molten metals, metal prepared from a ceramic slurry containing silicon carbide, a colloidal silica binder and at least 10 percent of fumed silica. The filter has enhanced strength properties.
Claims16
A ceramic foam filter for use in filtering molten metal comprising:
- a filter body prepared from a ceramic slurry composition containing an amount of silicon carbide, an amount of colloidal silica, and at least 10% of fumed silica;
- said filter body having an open cell structure with a plurality of interconnected voids surrounded by a web of said ceramic, whereby the amount of fumed silica is such that the strength of the filter is substantially enhanced.
A process for preparing a ceramic foam filter for filtering molten metal comprising the steps of:
- forming an aqueous slurry of ceramic composition including an amount of silicon carbide, an amount of colloidal silica, and at least 10% fumed silica;
- providing a reticulated organic polymer foam;
- impregnating the foam with the slurry;
- drying and heating the impregnated foam to remove the organic component, and firing at an elevated temperature to produce a ceramic foam filter.
1 more element
Dependencies are inferred from the claim text.