Next Article in Journal
Effect of Initial Surface Roughness on Cavitation Erosion Resistance of Arc-Sprayed Fe-Based Amorphous/Nanocrystalline Coatings
Next Article in Special Issue
Surface Roughness Reduction of Additive Manufactured Products by Applying a Functional Coating Using Ultrasonic Spray Coating
Previous Article in Journal
Electrophoretic Deposition as a New Bioactive Glass Coating Process for Orthodontic Stainless Steel
Previous Article in Special Issue
Effect of Particle Size on the Thermal Shock Resistance of Plasma-Sprayed YSZ Coatings
Article Menu
Issue 11 (November) cover image

Export Article

Open AccessArticle
Coatings 2017, 7(11), 198; https://doi.org/10.3390/coatings7110198

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

1
School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
2
The State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
3
Department of Physics, Kohat University of Science and Technology, Kohat 26000, Pakistan
*
Author to whom correspondence should be addressed.
Academic Editor: Morteza Eslamian
Received: 23 September 2017 / Revised: 29 October 2017 / Accepted: 5 November 2017 / Published: 13 November 2017
View Full-Text   |   Download PDF [2787 KB, uploaded 13 November 2017]   |  

Abstract

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
Figures

Figure 1

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).
SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Coatings EISSN 2079-6412 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top