期刊
COMPUTATIONAL MATERIALS SCIENCE
卷 99, 期 -, 页码 105-116出版社
ELSEVIER
DOI: 10.1016/j.commatsci.2014.12.004
关键词
Phase Field Model (PFM); Monoclinic phase (m-phase); Tetragonal phase (t-phase); Yttria-Stabilized Zirconia (YSZ); Thermal Barrier Coating (TBC); Planar Reaction Zone (PRZ)
资金
- King Fahd University of Petroleum and Minerals in Dhahran, Saudi Arabia through the Center for Clean Water and Clean Energy at KFUPM and MIT [MIT 11101, R9-CE]
It has been found that the use of low grade fuels in land-based turbines in Saudi Arabia results in the hot corrosion (Type-I) degradation due to the diffusion of a molten salt, V2O5, into top coat of thermal barrier coatings. Consequently, volumetric expansion of the coating occurs due to the tetragonal-to-monoclinic transformation of zirconia in the planar reaction zone near the surface of the coating. In the present study, a phase field model that estimates the kinetics of microstructure evolution during the corrosion process is estimated at 900 degrees C, and close agreement between numerical and experimental results is achieved. The transformation-induced stresses are predicted by coupling the phase transformation with elasticity. The governing equations are implemented numerically using the finite element method. The result shows that very high compressive stresses that are developed within the coating cross section eventually cause the spallation failure of the coating. (C) 2014 Elsevier B.V. All rights reserved.
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