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US 2014/0360316 A1Published application
BN or Y2O3 Coated Ceramic Filters Used in Filtration of Aluminum-Lithium Alloys and Reactive Alloys
AssigneePorvair PLC
InventorsLeonard S. Aubrey, Feng Chi, Lucas Damoah
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Abstract
A filter which is particularly suitable for filtration of molten metal, and method of making the filter, is described. The filter comprises a ceramic core comprising a primary component selected from the group consisting of alumina and magnesium oxide. A coating is on the ceramic core wherein the coating is selected from the group consisting of BN and Y2O3.
Claims51
A filter particularly suitable for filtration of molten metal wherein said filter comprises:
- a ceramic core comprising a primary component;
- and
- a coating on said ceramic core wherein said coating is selected from the group consisting of BN and Y2O3.
A method for filtering molten metal comprising:
- providing a filter comprising:
- a ceramic core comprising a primary component;
- and
- a coating on said ceramic core wherein said coating is selected from the group consisting of BN and Y2O3;
- and
- passing a molten metal through said filter wherein said molten metal comprises an alloy of aluminum or an alloy of magnesium.
3 more elements
A method for making a filter comprising:
- forming a slurry comprising a ceramic precursor;
- impregnating an open cell foam with said slurry to form a impregnated foam;
- heating said impregnated foam to vaporize said open cell foam and sinter said ceramic precursor forming a ceramic foam;
- coating said ceramic foam with a slurry comprising a material selected from the group consisting of BN and Y2O3forming a slurried coated ceramic foam;
- and
- drying said slurry coated ceramic foam to form said filter.
3 more elements
Dependencies are inferred from the claim text.