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Thermal durability of thermal barrier coatings with bond coat composition in cyclic thermal exposure

Title
Thermal durability of thermal barrier coatings with bond coat composition in cyclic thermal exposure
Author
백운규
Keywords
Thermal barrier coating; High-velocity oxy-fuel; Bond coat composition; Feedstock powder; Thermal durability
Issue Date
2015-08
Publisher
ELSEVIER SCIENCE SA
Citation
SURFACE & COATINGS TECHNOLOGY, v. 284, Page. 69-74
Abstract
The effects of bond coat composition on the microstructure evolution and thermal durability of thermal barrier coating (TBC) were investigated through cyclic thermal exposure. The microstructure of the bond coat was controlled using various feedstock powders, such as NiCrAlY, NiCoCrAIY, and CoNiCrAlY, which were coated on the Ni-based substrate using a high-velocity oxy-fuel process. The top coat was prepared with high purity feedstock powder (METCO 204 C-XCL) using an air plasma spray (APS) process. The thermal durability of the TBCs was evaluated through the cyclic thermal fatigue (CF) and thermal shock (TS) tests, including the microstructure evolution, the thermally grown oxide (TGO) growth behavior, and thermomechanical properties. After the CTF and TS tests, the TBC with the Ni-based bond coat showed a longer lifetime performance and less degradation in hardness value than those with the Ni-Co- and Co-Ni-based bond coats. The results indicate that the bond coat composition produce an obvious effect on the thermomechanical properties of the TBC system. The relationship between bond coat composition and thermal durability is extensively discussed, based on the microstructure evolution and element diffusion behavior. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0257897215004946http://hdl.handle.net/20.500.11754/26978
ISSN
0257-8972
DOI
10.1016/j.surfcoat.2015.08.030
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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