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Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ)

School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Department of Physics, Kohat University of Science and Technology, Kohat 26000, Pakistan
Author to whom correspondence should be addressed.
Academic Editor: Morteza Eslamian
Coatings 2017, 7(11), 198;
Received: 23 September 2017 / Revised: 29 October 2017 / Accepted: 5 November 2017 / Published: 13 November 2017
PDF [2787 KB, uploaded 13 November 2017]


In this paper, the effect of microstructure on the thermal conductivity of plasma-sprayed Y2O3 stabilized ZrO2 (YSZ) thermal barrier coatings (TBCs) is investigated. Nine freestanding samples deposited on aluminum alloys are studied. Cross-section morphology such as pores, cracks, m-phase content, grain boundary density of the coated samples are examined by scanning electron microscopy (SEM) and electron back-scattered diffraction (EBSD). Multiple linear regressions are used to develop quantitative models that describe the relationship between the particle parameters, m-phase content and features of the microstructure such as porosity, crack-porosity, and the length density of small and big angle-cracks. Moreover, the relationship between the microstructure and thermal conductivity is investigated. Results reveal that the thermal conductivity of the coating is mainly determined by the microstructure and grain boundary density at room temperature (25 °C), and by the length density of big-angle-crack, monoclinic phase content and grain boundary density at high temperature (1200 °C). View Full-Text
Keywords: thermal barrier coatings; 8 wt % YSZ; thermal conductivity; microstructure thermal barrier coatings; 8 wt % YSZ; thermal conductivity; microstructure

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Hu, N.; Khan, M.; Wang, Y.; Song, X.; Lin, C.; Chang, C.; Zeng, Y. Effect of Microstructure on the Thermal Conductivity of Plasma Sprayed Y2O3 Stabilized Zirconia (8% YSZ). Coatings 2017, 7, 198.

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