Highly corrosion and/or oxidation-resistant protective coating containing rhenium applied to gas turbine component surface and method thereof

US5268238A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Norbert Czech · Dorsten, DE
• Friedhelm Schmitz · Wittlich, DE

Key dates

• Filing date: Dec 2, 1992
• Grant date: Dec 7, 1993
• Expiry date: Dec 2, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12937
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method of protecting and a protective coating for metal components formed of nickel or cobalt-based superalloys are disclosed. The protective coating essentially consists of the following constituents (in percent by weight): PA0 1 to 20% rhenium, PA0 15 to 50% chromium, PA0 0 to 15% aluminum, the share of chromium and aluminum taken together being at least 25% and at most 53%, PA0 0.3 to 2% in total of at least one reactive element from the group consisting of the rare earths, and PA0 0 to 3% silicon, impurities, as well as the following elective components: PA0 0 to 5% hafnium, PA0 0 to 12% tungsten, PA0 0 to 10% manganese, PA0 0 to 15% tantalum, PA0 0 to 5% titanium, PA0 0 to 4% niobium, and PA0 0 to 2% zirconium, the total share of the elective components being from 0 to a maximum of 15%, and a remainder primarily being at least one of the elements iron, nickel, and cobalt. The protective coating is primarily suited for use with metal components in gas turbines and aircraft engines.