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US 10,584,411 B2Granted
Chromium-enriched diffused aluminide
AssigneeUnited Technologies Corporation
InventorsMark A. Livings, Chelsea Brown
Life of this patent
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Abstract
A method of applying a protective coating to an article comprises the steps of a) depositing aluminum in a surface region of an article, and b) depositing chromium is the surface region of the article subsequent to step a), whereby at least a portion of the chromium replaces at least a portion of the aluminum. Another method and an article are also disclosed.
Claims17
A method of applying a protective coating to an article, comprising the steps of:
- a) depositing aluminum in a surface region of an article;
- and
- b) depositing chromium in the surface region of the article with an activator subsequent to step a), whereby at least a portion of the chromium replaces at least a portion of the aluminum, wherein step b) results in a chromium layer having approximately 20-40% chromium by weight in an outer 30 to 60% of the coating thickness.
A method of applying a protective coating to an article, comprising the steps of:
- a) vapor depositing aluminum in a surface region of an article formed of a low-chromium nickel-based alloy;
- b) vapor depositing chromium in the surface region of the article while removing at least a portion of the aluminum using an activator;
- and
- c) heating the article such that the chromium replaces at least a portion of the aluminum through action of the activator, wherein steps b) and c) result in a chromium layer having approximately 20-40% chromium by weight in an outer 30 to 60% of the coating thickness.
1 more element
A method of applying a protective coating to an article, comprising the steps of:
- a) depositing aluminum in a surface region of an article;
- and
- b) depositing chromium in the surface region of the article with an activator subsequent to step a), whereby at least a portion of the chromium replaces at least a portion of the aluminum, wherein step b) results in a chromium layer substantially free of alpha chromium.
Dependencies are inferred from the claim text.