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Determination of Creep Behavior of Thermal Barrier Coatings Under Laser Imposed High Thermal and Stress Gradient ConditionsA laser sintering/creep technique has been established to determine the creep behavior of thermal barrier coatings under steady-state high heat flux conditions. For a plasma sprayed zirconia-8 wt. % yttria coating, a significant primary creep strain and a low apparent creep activation energy were observed. Possible creep mechanisms involved include stress induced mechanical sliding and temperature and stress enhanced cation diffusion through the splat and grain boundaries. The elastic modulus evolution, stress response, and total accumulated creep strain variation across the ceramic coating are simulated using a finite difference approach. The modeled creep response is consistent with experimental observations.
Document ID
19990027947
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Zhu, Dongming
(NASA Lewis Research Center Cleveland, OH United States)
Miller, Robert A.
(NASA Lewis Research Center Cleveland, OH United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Publication Information
Publication: Journal of Materials Research
Publisher: Materials Research Society
Volume: 14
Issue: 1
Subject Category
Nonmetallic Materials
Distribution Limits
Public
Copyright
Other

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