Nickel aluminide coating and coating systems formed therewith

a technology of nickel aluminide and coating system, which is applied in the direction of superimposed coating process, plasma technique, transportation and packaging, etc., can solve the problems of increasing internal oxidation, reducing mechanical properties, and components of the turbine, so as to improve oxidation and spallation resistance, the effect of improving the oxidation resistan

a technology of nickel aluminide and coating system, which is applied in the direction of superimposed coating process, plasma technique, transportation and packaging, etc., can solve the problems of increasing internal oxidation, reducing mechanical properties, and components of the turbine, so as to improve oxidation and spallation resistance, the effect of improving the oxidation resistan

US20050069650A1Inactive Publication Date: 2005-03-31GENERAL ELECTRIC CO
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  • Nickel aluminide coating and coating systems formed therewith
  • Nickel aluminide coating and coating systems formed therewith

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[0015] The present invention provides a composition and process for achieving a desirable combination of environmental properties in a predominantly beta-phase NiAl-based coating containing reactive element additions. In NiAl-based coatings of this invention, reactive element additions are incorporated to a level necessary for optimum oxidation resistance (i.e., below levels that would lead to excessive kp values) without significantly exceeding the solid solution limit of the element, while additional bond coat strength (needed for TBC spallation resistance) is provided by a stable dispersion of oxides, carbides and / or nitrides of the reactive element, e.g., zirconia (ZrO2), hafnia (HfO2), chromia (Cr2O3), yttria (Y2O3), ceria (CeO2), zirconium carbide (ZrC), hafnium carbide (HfC), etc., and possibly oxides, carbides and / or nitrides of other elements of the coating, e.g., alumina (Al2O3), aluminum nitride (AlN), etc.

[0016] In view of the above, beta-NiAl-based coatings of this inv...

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Abstract

A beta-phase NiAl overlay coating containing a dispersion of ceramic particles and a process for depositing the overlay coating. If the coating is used to adhere a thermal barrier coating (TBC), the TBC exhibits improved spallation resistance as a result of the dispersion of ceramic particles having a dispersion-strengthening effect on the overlay coating. The overlay coating contains at least one reactive element and is deposited so that the some of the reactive element deposits as the ceramic particles dispersed in the overlay coating.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a Division of U.S. patent application Ser. No. 10 / 249,564, filed Apr. 18, 2003.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH [0002] This invention was made with Government support under Agreement No. F33615-98-C-2893 awarded by the U.S. Department of the Air Force. The Government has certain rights in the invention.FIELD OF THE INVENTION [0003] The present invention generally relates to coatings of the type used to protect components exposed to high temperature environments, such as bond coats and environmental coatings for gas turbine engine components. More particularly, this invention is directed to a ceramic-containing beta-phase (β) NiAl (beta-NiAl) overlay coating for use as a bond coat or environmental coating. DESCRIPTION OF THE RELATED ART [0004] Components within the turbine, combustor and augmentor sections of gas turbine engines are susceptible to oxidation and hot corrosion attack, in addition to high...

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Application Information

Patent Timeline
31 Mar 2005
Publication
US20050069650A1
IPC
C23C4/02; C23C4/12; C23C14/06; C23C28/00
CPC
C23C4/02; Y10T428/12576; C23C14/06; C23C28/321; C23C28/3215; C23C28/324; C23C28/345; C23C28/3455
Inventors
DAROLIA, RAMGOPAL; RIGNEY, JOSEPH DAVID