The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 22, 2008
Filed:
Jul. 22, 2003
Functional coatings for the reduction of oxygen permeation and stress and method of forming the same
George E. Kim, Quebec, CA;
Julie M. Schoenung, Santa Ana, CA (US);
Virgil Provenzano, Bethesda, MD (US);
Enrique J. Lavernia, Santa Ana, CA (US);
Leonardo Ajdelsztajn, Los Angeles, CA (US);
George E. Kim, Quebec, CA;
Julie M. Schoenung, Santa Ana, CA (US);
Virgil Provenzano, Bethesda, MD (US);
Enrique J. Lavernia, Santa Ana, CA (US);
Leonardo Ajdelsztajn, Los Angeles, CA (US);
The Regents of the University of California, Oakland, CA (US);
Perpetual Technologies, Ile Des Soeurs, Quebec, CA;
Abstract
The oxidation behavior of the bond coat is improved using a HVOF nanostructured NiCrAlY coating. NiCrAlY powder is mechanically cryomilled and HVOF sprayed onto Ni-based alloy to form a nanocrystalline bond coat. Oxidation is performed on the coating to form the thermally grown oxide layer (thermally grown oxide). After heat treatment at 1000° C. for 24 and 95 hour, a homogeneous α-AlOlayer is formed on top of the bond coat. The nanostructured characteristic of the coating and the presence of AlOwithin the cryomilled powders (oxidation occurred during cryomilling process) affects the nucleation of the alumina layer on the top of the coating. The formation of a continuous thermally grown oxide layer protects the coating from further oxidation and avoids the formation of mixed oxide protrusions, such as those presented in the coating sprayed using the as-received powder.