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Open AccessArticle

Crack-Growth Behavior in Thermal Barrier Coatings with Cyclic Thermal Exposure

1
Department of Energy Engineering, Hanyang University, Seoul 133-791, Korea
2
School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 641-773, Korea
3
High Temperature Materials Research Group, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam 641-831, Korea
4
Department of Mechanical and Engineering, Indiana University–Purdue University Indianapolis, Indianapolis, IN 46202-5132, USA
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(6), 365; https://doi.org/10.3390/coatings9060365
Received: 3 May 2019 / Revised: 3 June 2019 / Accepted: 3 June 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Science and Technology of Thermal Barrier Coatings)
Crack-growth behavior in yttria-stabilized zirconia-based thermal barrier coatings (TBCs) is investigated through a cyclic thermal fatigue (CTF) test to understand TBCs’ failure mechanisms. Initial cracks were introduced on the coatings’ top surface and cross section using the micro-indentation technique. The results show that crack length in the surface-cracked TBCs grew parabolically with the number of cycles in the CTF test. Failure in the surface-cracked TBC was dependent on the initial crack length formed with different loading levels, suggesting the existence of a threshold surface crack length. For the cross section, the horizontal crack length increased in a similar manner as observed in the surface. By contrast, in the vertical direction, the crack did not grow very much with CTF testing. An analytical model is proposed to explain the experimentally-observed crack-growth behavior. View Full-Text
Keywords: thermal barrier coating; cyclic thermal fatigue; crack growth; initial crack length; failure thermal barrier coating; cyclic thermal fatigue; crack growth; initial crack length; failure
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MDPI and ACS Style

Song, D.; Song, T.; Paik, U.; Lyu, G.; Jung, Y.-G.; Choi, B.-G.; Kim, I.-S.; Zhang, J. Crack-Growth Behavior in Thermal Barrier Coatings with Cyclic Thermal Exposure. Coatings 2019, 9, 365.

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