Method for repair and restoration of a ceramic thermal barrier-coated substrate by providing an intermetallic coating
AssigneeGeneral Electric Company
InventorAntonio F. Maricocchi
Life of this patent
Estimating the term…
Abstract
An aluminide coating is applied to a portion of the surface of an article that already has a thermal barrier coating system in place over another portion of its surface. The portion of the surface to be coated is contacted, at elevated temperature, with an aluminide coating source material that is a mixture of from about 18 to about 45 weight percent of a metallic source of aluminum and the balance ceramic particles. The metallic source of aluminum may be pure aluminum or an aluminum-containing alloy. No halide activator is present in the aluminide coating source material.
Claims19
A process for providing an intermetallic coating on the surface of an article, comprising the steps of:
- providing an article having a bond coat overlying at least a portion of the surface of the article and a ceramic thermal barrier coating overlying the bond coat;
- and
- applying a protective layer over an uncoated portion of the surface by contacting at least the uncoated portion of the surface of the article with an intermetallic coating source material, the intermetallic coating source material comprising a mixture of a metallic source of aluminum and ceramic particles, the intermetallic coating source material having no halide activator therein.
A process for providing an aluminide coating on the surface of an article, comprising:
- providing an article having a bond coat overlying at least a portion of the surface of the article and a ceramic thermal barrier coating overlying the bond coat;
- and
- contacting at least the uncoated portion of the surface of the article with an aluminide coating source material, the aluminide coating source material comprising a mixture of from about 20 to about 40 percent by weight of a metallic source of aluminum and the balance ceramic particles, the aluminide coating source material having no halide activator therein.
A process for providing an aluminide coating on the surface of an article, comprising the steps of:
- providing an article having a bond coat overlying at least a portion of the surface of the article and a ceramic thermal barrier coating overlying the bond coat;
- subjecting the article to conditions such that, after the step of subjecting, an uncoated portion of the surface of the article has no bond coat and no ceramic thermal barrier coating thereupon;
- and
- coating at least the uncoated portion of the surface of the article with an aluminum-containing coating by contacting the uncoated portion with an aluminum coating source material at elevated temperatures so that the uncoated portion of the surface is aluminided by diffusion, the aluminide coating source material having no halide activator therein, without damaging the ceramic thermal barrier coating on the remainder of the article.
Dependencies are inferred from the claim text.