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US 2011/0217560 A1Published application
Coated article and coating process therefor
AssigneeUnited Technologies Corporation
InventorNeil B. Ridgeway
Life of this patent
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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.
Claims16
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.
1 more element
A coating process comprising:
- preheating a metallic workpiece having an aluminum-containing layer through a temperature range from 700° F. (371° C.) to at least 1800° F. (982° C.) in a reducing atmosphere having hydrogen to thereby limit formation of undesired types of thermally grown oxides on the surfaces of the metallic workpiece;
- introducing a source of oxygen to establish an oxidizing atmosphere at a temperature above the temperature range to form a continuous alpha alumina thermally grown oxide on the surfaces of the workpiece;
- and
- depositing a ceramic coating on the continuous alpha alumina thermally grown oxide.
1 more element
A coated article comprising:
- a body having an aluminum-containing layer;
- a continuous thermally grown oxide on the body;
- and
- a coating on the continuous thermally grown oxide.
1 more element
Dependencies are inferred from the claim text.