beta -Alumina coating

摘要

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.