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:
Mar. 18, 2025
Filed:
Nov. 03, 2021
Irina Belov, Zionsville, IN (US);
Zhihong Tang, Carmel, IN (US);
Mark W. Perpall, Indianapolis, IN (US);
Daryl G. Copeland, Greenwood, IN (US);
Brian D. Fitzwater, Indianapolis, IN (US);
Irina Belov, Zionsville, IN (US);
Zhihong Tang, Carmel, IN (US);
Mark W. Perpall, Indianapolis, IN (US);
Daryl G. Copeland, Greenwood, IN (US);
Brian D. Fitzwater, Indianapolis, IN (US);
Praxair S.T. Technology, Inc., North Haven, CT (US);
Abstract
Hexavalent chromium-free slurry formulations which are suitable in the production of inorganic overlay coating systems are described. The formulations provide superior hot corrosion and high-temperature 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:P higher than about 1:3 with the incorporation of pigments of either metallic particles, or metal oxide particles, or both in combination. The topcoat slurry includes an aluminum phosphate based aqueous solution having a molar ratio of Al:P higher than about 1:3. An inorganic overlay coating formed on substrate made from the slurry formulation of present invention for hot corrosion protection on superalloy substrate against hot corrosion. Furthermore, a multilayer coating comprises a metallic bond coat and an inorganic overlay coating formed on superalloy substrate to further enhance high-temperature oxidation and hot corrosion protection.