.beta.-Alumina coating
AssigneeWestinghouse Electric Corp.
InventorsFrank D. Rizzelli, Kimon Papadopoulos
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Abstract
Disclosed is a method of coating a substrate with .beta.-alumina, a compound of alumina and an alkali metal oxide, while maintaining its electrically conductive properties. A powdered mixture is formed of the .beta.-alumina and a carbonate of the alkali metal. The mixture is sprayed through a source of heat sufficient to melt it onto the substrate. A plasma spray torch can be used to melt spray the mixture.
Claims10
A method of coating a substrate with .beta.-alumina, a compound of alumina and an alkali metal oxide, comprising:
- (1) forming a powdered mixture of about 80 to about 95% by weight .beta.-alumina and about 5 to about 20% by weight of a carbonate of an alkali metal;
- and
- (2) spraying said powdered mixture through a source of heat sufficient to melt it, and onto said substrate.
A method of coating a substrate with a compound having the general formula nM.sub.2 O. (1-n)Al.sub.2 O.sub.3 where n is 0.005 to 0.20 amd M is selected from the group consisting of Na, Li, K, and mixtures thereof, comprising:
- (1) forming a mixture having a particle size less than 100 mesh of about 80 to about 95% by weight of said compound and about 5 to about 20% M.sub.2 CO.sub.3 ;
- (2) melt spraying said mixture onto said substrate using a plasma spray torch.
Dependencies are inferred from the claim text.