Highly corrosion and/or oxidation-resistant protective coating containing rhenium

US5273712A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Feb 26, 1992
• Grant date: Dec 28, 1993
• Expiry date: Feb 26, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C30/00
• 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): PA1 1 to 20% rhenium, PA1 15 to 50% chromium, PA1 0 to 15% aluminum, the share of chromium and aluminum taken together being at least 25% and at most 53%, PA1 0.3 to 2% in total of at least one reactive element from the group consisting of the rare earths, and PA1 0 to 3% silicon, impurities, as well as the following elective components: PA1 0 to 5% hafnium, PA1 0 to 12% tungsten, PA1 0 to 10% manganese, PA1 0 to 15% tantalum, PA1 0 to 5% titanium, PA1 0 to 4% niobium, and PA1 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.