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US 9,315,905 B2Granted
Coated article and coating process therefor
AssigneeUnited Technologies Corporation
InventorNeil B. Ridgeway
Life of this patent
Estimating the term…
Abstract
A coating process includes preheating a workpiece having an aluminum-containing layer through a temperature range in a reducing atmosphere having hydrogen to limit formation of thermally grown oxides on the surface of the workpiece. A source of oxygen is introduced to establish an oxidizing atmosphere at a temperature above the temperature range to form a desired type of thermally grown oxide on the surfaces of the workpiece. A coating is then deposited on the desired type of thermally grown oxide.
Claims20
A coating process comprising:
- preheating a workpiece having an aluminum-containing layer through a temperature range in a reducing atmosphere having hydrogen to thereby limit formation of thermally grown oxides on the surfaces of the workpiece;
- introducing a source of oxygen to establish an oxidizing atmosphere at a temperature above the temperature range to form a desired type of thermally grown oxide on the surfaces of the workpiece;
- and
- depositing a coating on the desired type of thermally grown oxide wherein the preheating is conducted at approximately ambient pressure.
1 more element
A coating process comprising:
- preheating a workpiece having an aluminum-containing layer through a temperature range in a reducing atmosphere having hydrogen to thereby limit formation of thermally grown oxides on the surfaces of the workpiece;
- introducing a source of oxygen to establish an oxidizing atmosphere at a temperature above the temperature range to form a desired type of thermally grown oxide on the surfaces of the workpiece;
- and
- depositing a coating on the desired type of thermally grown oxide wherein the source of oxygen is carbon dioxide.
1 more element
A coating process comprising:
- preheating a workpiece having an aluminum-containing layer through a temperature range in a reducing atmosphere having hydrogen to thereby limit formation of thermally grown oxides on the surfaces of the workpiece;
- introducing a source of oxygen to establish an oxidizing atmosphere at a temperature above the temperature range to form a desired type of thermally grown oxide on the surfaces of the workpiece;
- and
- depositing a coating on the desired type of thermally grown oxide wherein the source of oxygen is a mixture of carbon dioxide and hydrogen.
1 more element
A coating process comprising:
- preheating a workpiece having an aluminum-containing layer through a temperature range in a reducing atmosphere having hydrogen to thereby limit formation of thermally grown oxides on the surfaces of the workpiece;
- introducing a source of oxygen to establish an oxidizing atmosphere at a temperature above the temperature range to form a desired type of thermally grown oxide on the surfaces of the workpiece;
- and
- depositing a coating on the desired type of thermally grown oxide, wherein the hydrogen in the preheating consumes oxygen present in the reducing atmosphere to prevent the oxygen from reacting with the aluminum-containing layer.
1 more element
Dependencies are inferred from the claim text.