Hot Corrosion Resistance of Materials for Small Gas Turbine Recuperators
Abstract
Hot corrosion tests were carried out on various brazed recuperator tubing materials to determine their suitability for service in gas turbine exhaust environments. Five tubing materials (Hastelloy x, Inconel 625, Icoloy 800, N-155, and Type 347 stainless steel) and three types of brazing alloy (nickel based, nickel-manganese based and gold based) were selected for evaluation on the basis of economics, corrosion resistance, and mechanical properties. Thin wall tubes, having simulated headers brazed to them, were exposed at temperatures between 1100 and 1500F to synthetic turbine exhaust gases containing sea salts. In this environment, stress-rupture properties were measured under thermal cycling conditions for periods up to 1000 hours. Following these tests, a recuperator, fabricated from N-155 and Incoloy 800 using a nickel based brazing alloy, was operated in the salt contaminated exhaust of a JP-4 fuelled combustor for a period of 500 hours, with tube temperatures ranging from 900 to 1500F.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1969
- Accession Number
- AD0866981
Entities
People
- Don W. Mcgrath
- Erich W. Gellersen
- George Curbishley
- William Larson