Gasket with high temperature coating
AssigneeInterface Performance Materials, Inc.
InventorsJeffery L. Barrall, Brian C. Lehr
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Abstract
A method of making a gasket having a high temperature coating that includes obtaining a substrate formed from a metallic material and having the shape of a gasket, applying a nanoparticle suspension over the outer surfaces of the substrate, and heating the substrate to a first elevated temperature to form an undercoat layer of a self-protective oxide coating. The method also includes applying a liquid comprising boron nitride over the undercoat layer and drying the boron nitride liquid at a second elevated temperature to form an overcoat layer.
Claims8
An exhaust gas gasket having a high temperature coating, the exhaust gas gasket comprising:
- a substrate formed from a solid metallic material through the thickness thereof and having a shape of a gasket, the substrate having an upper surface, a lower surface, and an aperture formed therethrough;
- an undercoat layer covering substantially all of the surface area of at least one of the upper surface and the lower surface, the undercoat layer comprising a self-protective oxide coating formed from a plurality of nanoparticles applied to the surface and heated to a first elevated temperature to form the self-protective oxide coating;
- and
- an overcoat layer formed on the undercoat layer to provide lubricity to the surface of the gasket, the overcoat layer comprising boron nitride,
- wherein the combination of the undercoat layer and the overcoat layer prevents the deterioration of the lubricity of the overcoat layer when the gasket is exposed to repeated thermal cycling between ambient temperature and an operational temperature of 600° C. or greater.
Dependencies are inferred from the claim text.