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US 8,273,416 B2Granted
Process for sulfidation-resistant coating system
AssigneeGeneral Electric Company
InventorsDavid A. Helmick, Yuk-Chiu Lau, David Vincent Bucci
Life of this patent
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Abstract
A coating system and process for protecting component surfaces exposed to sulfur-containing environments at elevated temperatures. The coating system includes a sulfidation-resistant overlay coating that is predominantly niobium or molybdenum.
Claims6
A process comprising:
- depositing a coating system on a metallic surface region of a coal gasifier component that is formed of a nickel-based or cobalt-based superalloy, the coating system comprising a sulfidation-resistant overlay coating on and contacting the metallic surface region and an adherent molybdenum sulfide layer on an outermost surface of the overlay coating, the overlay coating consisting of molybdenum and impurities, the molybdenum sulfide layer inhibiting sulfidation of the overlay coating and the metallic surface region;
- installing the component in an operating coal gasifier;
- and
- contacting the coating system on the component with a coal gas or syngas that contains sulfur and/or sulfur compounds at an elevated temperature.
1 more element
Dependencies are inferred from the claim text.