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:
Dec. 27, 2022
Filed:
May. 08, 2019
Praxair S.t. Technology, Inc., North Haven, CT (US);
Irina Belov, Zionsville, IN (US);
Zhihong Tang, Carmel, IN (US);
Brian Fitzwater, Indianapolis, IN (US);
Daryl G Copeland, Greenwood, IN (US);
Praxair S.T. Technology, Inc., North Haven, CT (US);
Abstract
Hexavalent chromium-free slurry formulations which are suitable in the production of ceramic overlay coating systems are described. The formulations provide superior hot corrosion and heat oxidation protection for superalloy substrates. A basecoat slurry and topcoat slurry are provided. The basecoat slurry includes an aluminum phosphate based aqueous solution having a molar ratio of Al:POhigher than about 1:3 with the incorporation of metal oxide particles. The topcoat slurry includes an aluminum phosphate based aqueous solution having a molar ratio of Al:POhigher than about 1:3. Both of the basecoat slurry and the topcoat slurry are hexavalent chromium-free.