Northrop Grumman Systems Corporation

John Willis

Steven J Null

James W Bohlen

Blake T Tatsuta

Thomas A Seitz

Michael L Peters

A method for forming an elevated temperature durable coating on a surface of a substrate includes applying an aqueous slurry comprising lithium silicate, sodium silicate, potassium silicate, zirconia powder, a fibrous agent, and a magnetic powder to a surface of a substrate in one or more layers of substantially uniform thickness to form a coating. A substantially controlled humidity environment is maintained during application of the aqueous slurry and the coating is ambient dried for a period. A drying agent is applied to the coating and formation of a dry crust is prevented on the coating during ambient drying. After the period, the coating is heat cured.

System and method for forming a low temperature cured ceramic coating for elevated temperature applications

A method of controlling drying stresses through controlled shrinkage of a ceramic coating coated onto a substrate. The method first includes applying a non-cured ceramic coating onto the substrate and permitting the coating to dry until a mechanically stable outer surface layer of the coating is formed. Once this layer is formed, a drying control is applied in a quantity sufficient to penetrate into the surface layer, with the result of such application being the inhibition of formation of a dry outer skin as continued drying is permitted to occur. Once such drying is complete, the outer surface layer is subjected to an elevated temperature for curing and for evaporating therefrom the drying control agent to thereby produce a cured-ceramic coated substrate whose coating is void of large cracks and whose durability is beneficially opportune.

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Malibu, CA, United States of America

John Willis