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- Title
Microcrack Morphology in the Thermal Insulation Performance of 8YSZ Thermal Barrier Coatings: A Mesoscale Numerical Study.
- Authors
Huang, Linjing; Dou, Ruifeng; Wen, Zhi; Liu, Ningning; Yu, Mengqi; Liu, Xunliang
- Abstract
The initiation and development of microcracks change the temperature distribution of thermal barrier coatings (TBCs). The effect of such a change on heat insulation performance cannot be ignored. A three-dimensional mesoscopic structure model of random microcracks coupled with a general pore structure was established by using the quartet structure generation set method and the Monte Carlo simulation method. Then, a mesoscale thermal analysis model was constructed on the basis of the lattice Boltzmann method to study the influence of microcracks on the thermal insulation properties, such as temperature field distribution and thermal conductivity, of TBCs, and the evolution law of thermal insulation properties, which guides the preparation and use of TBCs, was obtained. Results showed that the inhomogeneity of the temperature field was aggravated by the initiation, growth, and number of microcracks. The increase in the size and number of random microcracks was beneficial for improving the thermal insulation performance of spherical and columnar coatings, whereas the increase in microcrack size and the relative decrease in microcrack number were beneficial for improving the thermal insulation performance of layered coatings. Microcracks can improve the thermal insulation performance of coatings with different structures, and the thermal conductivities of the layered, spherical, and columnar coatings decreased by 8.71, 11.25, and 13.81 %, respectively.
- Subjects
THERMAL conductivity; THERMAL barrier coatings; THERMAL insulation; MICROCRACKS; MONTE Carlo method; LATTICE Boltzmann methods; POROSITY; TEMPERATURE distribution
- Publication
Journal of Thermal Spray Technology, 2023, Vol 32, Issue 4, p1115
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-022-01521-x