Fiber reinforced filter for molten metal filtration and method for producing such filters
AssigneeVesuvius Crucible Company
InventorKassim Juma
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Abstract
The present invention relates to a fiber reinforced ceramic filter for molten metal filtration that comprises a bonded network of graphitized carbon and a method for producing such filters.
Claims33
A ceramic filter for molten metal filtration comprising a ceramic powder and fibers bonded by a network of graphitized carbon.
2-3. (canceled)
A filter for molten metal filtration comprising fibers bonded by a network of graphitized carbon.
5-21. (canceled)
A method to produce filters for molten metal filtration comprising fibers and a bonded network of graphitized carbon, comprising:
- a) impregnating a foam comprising a thermoplastic material with a slurry comprising fibers and a graphitizable carbon-bonding precursor;
- b) drying the impregnated foam;
- c) firing the impregnated foam in a non-oxidizing atmosphere at a temperature from 500-1000° C., whereby the carbon-bonding precursor is converted at least partially to a bonded network of graphitized carbon.
A method to produce filters for molten metal filtration comprising fibers and a bonded network of graphitized carbon, comprising:
- a) pressing a semi-damp mixture comprising fibers and a graphitizable carbon-bonding precursor to obtain a perforated article;
- b) firing the perforated article in a non-oxidizing atmosphere at a temperature from 500-1000° C., whereby the carbon-bonding precursor is converted at least partially to a bonded network of graphitized carbon.
Dependencies are inferred from the claim text.