초록

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.

대표청구항 ▼

The invention claimed is: 1. A ceramic filter for molten metal filtration comprising a ceramic powder and fibers bonded by a network of graphitizable carbon fired in a non-oxidizing atmosphere at a temperature from 500° C. to 1000° C., wherein the graphitizable carbon is produced from graphitizable

The invention claimed is: 1. A ceramic filter for molten metal filtration comprising a ceramic powder and fibers bonded by a network of graphitizable carbon fired in a non-oxidizing atmosphere at a temperature from 500° C. to 1000° C., wherein the graphitizable carbon is produced from graphitizable carbon precursor present in an amount from 2% to 15% by weight. 2. The filter of claim 1, wherein the ceramic powder is selected from a group consisting of zirconia, silica, alumina, brown fused alumina, magnesia, clay, talcum, mica, silicon carbide, silicon-nitride, graphite and mixtures thereof. 3. The filter of claim 1, wherein the filter comprises graphitizable carbon produced from 5 to 15 wt % graphitizable carbon precursor, and wherein the graphitizable carbon is fired in a non-oxidizing atmosphere at a temperature from 500° C. to 1000° C. 4. The filter of claim 1, wherein the fibers are selected from a group consisting of ceramic fibers, glass fibers, organic fibers, carbon fibers, metal fibers and mixtures thereof. 5. The filter of claim 1, wherein the filter comprises 1-10 wt % fibers. 6. A filter for molten metal filtration comprising fibers bonded by a network of graphitizable carbon fired in a non-oxidizing atmosphere at a temperature from 500° C. to 1000° C., wherein the graphitizable carbon is produced from graphitizable carbon precursor present in an amount from 2% to 15% by weight. 7. The filter of claim 6, wherein the fibers are selected from a group consisting of ceramic fibers, glass fibers, organic fibers, carbon fibers, metal fibers and mixtures thereof. 8. The filter of claim 7, wherein the ceramic fibers are selected from a group consisting of alumina fibers, silica fibers, aluminosilicate fibers and mixtures thereof. 9. The filter of claim 7, wherein the organic fibers are selected from a group consisting of polyester fibers, polyacrylnitrile fibers, polyethylene fibers, polyamide fibers, viscose fibers, aramid fibers and mixtures thereof. 10. The filter of claim 6, wherein the filter comprises 1-10 wt % fibers. 11. The filter of claim 6, wherein the fibers have a length from 0.1 to 5 mm.