NiCrAl ternary alloy having improved cyclic oxidation resistance

US4340425A · kind A · utility

Inventors

• Robert A. Administrator of the National Aeronautics and Space Frosch · La Cañada Flintridge, US
• Charles A. Barrett · Fairview Park, US
• Carl E. Lowell · Lakewood, US
• Abdus Khan · North Palm Beach, US

Key dates

• Filing date: Oct 23, 1980
• Grant date: Jul 20, 1982
• Expiry date: Oct 23, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C19/058
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

NiCrAl alloys are improved by the addition of zirconium. These alloys are in the .beta. or .gamma./.gamma.'+.beta. region of the ternary system. Zirconium is added in a very low amount between 0.06 and 0.20 weight percent. There is a narrow optimum zirconium level at the low value of 0.13 weight percent. Maximum resistance to cyclic oxidation is achieved when the zirconium addition is at the optimum value.