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Analysis of thermoelastic characteristics for vertical-cracked thermal barrier coatings through mathematical approaches

Title
Analysis of thermoelastic characteristics for vertical-cracked thermal barrier coatings through mathematical approaches
Author
백운규
Keywords
Thermal barrier coatings; Air plasma spray; Vertical type crack; Thermoelastic characteristics
Issue Date
2011-12
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Proceedings of the 38th International Conference on Metallurgical Coatings and Thin Films (ICMCTF), Surface & Coatings Technology, 25 December 2011, 206(7), p.1615-1620
Abstract
Thermoelastic characteristics of thermal barrier coatings (TBCs) with vertical cracks were analyzed through mathematical approaches to investigate the thermoelastic behaviors of TBCs in a service temperature. TriplexPro (TM)-200 system was applied to prepare the relatively dense TBC using METECO 204NS powder. The microstructure of top coat in the TBC was just controlled to create vertical type cracks by reheating without powder feeding in same equipment and rapid cooling process. A couple of governing partial differential equations were derived based on the thermoelastic theory, and a finite volume model was developed to the governing equations to evaluate the thermoelastic characteristics, such as temperature distribution profile, displacement, and stress, inducing a thermal fatigue. For the specimen with two or more vertical type cracks, smaller displacement appears to longitudinal direction and larger displacement to radial direction as the number of crack increases. In the longitudinal stress distribution profiles to z-direction, the tensile stress at the interface between the bond coat and the substrate converts into the compressive stress when the specimen has vertical cracks more than two, while larger magnitude undulation develops for the specimen with smaller number of crack in the radial stress distribution profiles. The results obtained demonstrate that multiple vertical cracks enhance the thermal durability and extend the lifetime of TBCs. (C) 2011 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0257897211007754http://hdl.handle.net/20.500.11754/65789
ISSN
0257-8972
DOI
10.1016/j.surfcoat.2011.07.083
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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