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- Title
A Concept for the EQ Coating System for Nickel-Based Superalloys.
- Authors
Kawagishi, K.; Sato, A.; Harada, H.
- Abstract
Nickel-based single-crystal superalloys with high concentrations of refractory elements are prone to generate a diffusion layer called a secondary reaction zone (SRZ) beneath their bond coating during long exposure to high temperatures. The SRZ causes a reduction of the load-bearing cross section and it is detrimental to the creep properties of thin-walled turbine airfoils. In this study, a new bond coat system, "EQ coating," which is thermodynamically stable and suppresses SRZ has been proposed. Diffusion couples of coating materials and substrate alloys were made and heat treated at 1,100°C for 300 h and 1,000 h. Cyclic oxidation examinations were carried out at 1,100°C in air and the oxidation properties of EQ coating materials were discussed. High-velocity frame-sprayed EQ coatings designed for second-generation nickel-based superalloys were deposited on fourth- and fifth-generation nickel-based superalloys, and the stability of the microstructure at the interface and creep property of the coating system were investigated.
- Subjects
SURFACE coatings; HEAT resistant alloys; NICKEL; MATERIALS at high temperatures; MICROSTRUCTURE; OXIDATION
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2008, Vol 60, Issue 7, p31
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-008-0086-z