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Coatings 2018, 8(9), 311; https://doi.org/10.3390/coatings8090311

The Temperature Distribution in Plasma-Sprayed Thermal-Barrier Coatings During Crack Propagation and Coalescence

1
School of Materials Science and Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, China
2
State key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi’an 710077, Shaanxi, China
*
Authors to whom correspondence should be addressed.
Received: 7 August 2018 / Revised: 25 August 2018 / Accepted: 3 September 2018 / Published: 4 September 2018
(This article belongs to the Special Issue From Metallic Coatings to Additive Manufacturing)
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Abstract

A Finite-Element Model (FEM) for thermal-barrier coatings was employed to elaborate the temperature distribution on yttria-stabilized zirconia (YSZ) free surface during cracks coalescing, then the influence of sintering of YSZ induced by heat-transfer overlapping on energy release rate was quantificationally evaluated. A three-dimensional model including three layers was fabricated. Two types of cracks, with and without depth variations in YSZ coating, were introduced into the model, respectively. The temperature rise of YSZ coating over the crack is independent of each other at the beginning of crack propagation. As crack distance shortens, the independent temperature-rise regions begin to overlap, while maximum temperature is still located at the crack center before crack coalescence. The critical distance that the regions of temperature rise, just overlapping, is the sum of half lengths of two coalescing cracks (i.e., a1 + a2), which is independent of cracking path. The maximum temperature in YSZ sharply increases once cracks coalesce. Compared with one delamination crack, the effective energy-release rate induced by heat-transfer overlapping increases in the range of 0.2%–15%, depending on crack length and crack distance, which is on some level comparable to that of deterioration of thermal expansion misfit induced by temperature jump between crack faces. View Full-Text
Keywords: plasma spraying; thermal-barrier coatings (TBC); temperature distribution; crack propagation; cracking path; YSZ sintering plasma spraying; thermal-barrier coatings (TBC); temperature distribution; crack propagation; cracking path; YSZ sintering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Dong, H.; Han, Y.; Zhou, Y.; Li, X.; Yao, J.-T.; Li, Y. The Temperature Distribution in Plasma-Sprayed Thermal-Barrier Coatings During Crack Propagation and Coalescence. Coatings 2018, 8, 311.

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