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Open AccessArticle

Experimental and Modeling Studies of Bond Coat Species Effect on Microstructure Evolution in EB-PVD Thermal Barrier Coatings in Cyclic Thermal Environments

1
School of Materials and Metallurgy Engineering, University of Science and Technology Liaoning, No. 185 High-Tech District, An Shan 114051, China
2
School of Materials Science and Engineering, Changwon National University Changwon, Gyeongnam 51140, Korea
3
Department of Mechanical and Energy Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202-5132, USA
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(10), 626; https://doi.org/10.3390/coatings9100626
Received: 26 July 2019 / Revised: 10 September 2019 / Accepted: 11 September 2019 / Published: 28 September 2019
(This article belongs to the Special Issue Science and Technology of Thermal Barrier Coatings)
In this work, the effects of bond coat species on the thermal barrier coating (TBC) microstructure are investigated under thermal cyclic conditions. The TBC samples are prepared by electron beam-physical vapor deposition with two species of bond coats prepared by either air-plasma spray (APS) or high-velocity oxygen fuel (HVOF) methods. The TBC samples are evaluated in a variety of thermal cyclic conditions, including flame thermal fatigue (FTF), cyclic furnace thermal fatigue (CFTF), and thermal shock (TS) tests. In FTF test, the interface microstructures of TBC samples show a sound condition without any delamination or cracking. In CFTF and TS tests, the TBCs with the HVOF bond coat demonstrate better thermal durability than that by APS. In parallel with the experiments, a finite element (FE) model is developed. Using a transient thermal analysis, the high-temperature creep-fatigue behavior of the TBC samples is simulated similar to the conditions used in CFTF test. The FE simulation predicts a lower equivalent stress at the interface between the top coat and bond coat in bond coat prepared using HVOF compared with APS, suggesting a longer cyclic life of the coating with the HVOF bond coat, which is consistent with the experimental observation. View Full-Text
Keywords: thermal barrier coating; bond coat species; electron beam-physical vapor deposition; cyclic thermal exposure; thermal durability thermal barrier coating; bond coat species; electron beam-physical vapor deposition; cyclic thermal exposure; thermal durability
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MDPI and ACS Style

Lu, Z.; Lyu, G.; Gulhane, A.; Park, H.-M.; Kim, J.S.; Jung, Y.-G.; Zhang, J. Experimental and Modeling Studies of Bond Coat Species Effect on Microstructure Evolution in EB-PVD Thermal Barrier Coatings in Cyclic Thermal Environments. Coatings 2019, 9, 626.

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