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A comparative study of calcium–magnesium–aluminum–silicon oxide mitigation in selected self-healing thermal barrier coating ceramics

Published online by Cambridge University Press:  20 August 2020

Jingjing Gu
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas76203, USA
Bowen Wei
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas76203, USA
Alexander F. Berendt
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas76203, USA
Anindya Ghoshal
Affiliation:
U.S. Army Combat Capabilities Development Command – Army Research Laboratory, Adelphi, Maryland21005, USA
Michael Walock
Affiliation:
U.S. Army Combat Capabilities Development Command – Army Research Laboratory, Adelphi, Maryland21005, USA
Richard F. Reidy
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas76203, USA
Diana Berman
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas76203, USA
Samir M. Aouadi*
Affiliation:
Department of Materials Science and Engineering, University of North Texas, Denton, Texas76203, USA
*
a)Address all correspondence to this author. e-mail: Samir.Aouadi@unt.edu
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Abstract

The mitigation of CMAS (calcium–magnesium–aluminum–silicon oxide) infiltration is a major requirement for the stability of thermal barrier coatings. In this study, yttria-stabilized zirconia (YSZ)–Al2O3–SiC, YSZ–Al2O3–Ta2O5, and YSZ–Al2O3–Nb2O5 self-healing composites produced by uniaxially pressing powders were investigated as an alternative to YSZ. CMAS infiltration in these materials was tested at 1250 °C for 10 h. Comparing the depth of CMAS infiltration using scanning electron microscope (SEM) in tandem with electron-dispersive X-ray spectroscopy (EDS), all self-healing materials were found to perform better than the reference materials. While standard YSZ shows massive CMAS infiltration, SEM micrographs and EDS maps revealed a 33-fold improvement in CMAS resistance for the YSZ–Al2O3–Nb2O5 system, which exhibited the best performance among the selected self-repairing materials. X-ray diffraction and high-resolution SEM micrographs taken 10 μm below the surface revealed that CMAS only infiltrated pores in the topmost region of the samples. Both YSZ–Al2O3–Ta2O5 and YSZ–Al2O3–Nb2O5 systems showed no signs of chemical reaction with CMAS.

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Article
Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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Footnotes

b)

Contributing Editor: Michael Walock.

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