Protective coating on metal
AssigneeCorning Incorporated
InventorsDavid G. Grossman, Kamjula P. Reddy, Michael H. Wasilewski
Life of this patent
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Abstract
A metal article, in particular a component for a thermal cracking furnace, and a method of protecting the metal from exposure to carbon, the article having a protective coating that has a glass-ceramic surface and an interior having a CTE between that of the glass-ceramic and the metal.
Claims23
A metal article having a protective coating, the coating comprising a plurality of layers, in which each layer is formed of a glass-ceramic and metal mixture in variable proportions, such that across the plurality of layers the respective content of a glass-ceramic component is inversely proportional to that of a metal component, in which each layer has a different coefficient of thermal expansion (CTE), and the plurality of layers creates a continuous CTE gradient between a coated-metal surface of the metal article and an exposed surface of the coating.
A metal article having a protective coating, the coating comprising a plurality of layers, in which each layer is composed of mixture of a glass-ceramic material and a second material having a CTE higher than that of the glass-ceramic material in variable proportions, such that across the plurality of layers the respective content of a glass-ceramic component is inversely proportional to that of a second material component, in which each layer has a different coefficient of thermal expansion (CTE), and the plurality of layers provides a continuous CTE gradient between a coated-metal surface of the metal article and an exposed surface of the coating.
A protective coating on a metal article, the protective coating comprises a plurality of layers, each of a mixture of a glass-ceramic material and a second material, the proportions of each material varies continuously from a coated-metal interface of the metal article to an exposed, outer surface of the coating, wherein across the plurality of layers, the coating likewise exhibits a continuous CTE gradient between a coated-metal surface and the outer surface of the coating.
Dependencies are inferred from the claim text.