Bn or Y₂O₃coated ceramic filters used in filtration of aluminum—lithium alloys and reactive alloys

摘要

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.

主权项

1. A filter particularly suitable for filtration of molten metal wherein said filter comprises:
a ceramic core comprising a primary component wherein said primary component is selected from the group consisting of sinter bonded alumina, aluminum phosphate bonded alumina, glass bonded alumina and glass bonded SiC; and a coating on said ceramic core wherein said coating is selected from the group consisting of BN and Y2O3 wherein said ceramic core has a surface area and said coating covers at least 90% of said surface area.