Thermo – mechanical properties of SPS produced self-healing thermal barrier coatings containing pure and alloyed MoSi<sub>2</sub> particles

Journal article (2018)

Authors

Justyna Kulczyk-Malecka The University of Manchester
Xun Zhang The University of Manchester
Ping Xiao The University of Manchester
James Carr The University of Manchester
Franck Nozahic Université de Toulouse
Claude Estournès Université de Toulouse
Daniel Monceau Université de Toulouse
A.L. Carabat (OLD) MSE-1
W.G. Sloof (OLD) MSE-1
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering
Philip J. Withers The University of Manchester
Research Group
(OLD) MSE-1
Copyright: © 2018 Justyna Kulczyk-Malecka, Xun Zhang, James Carr, Franck Nozahic, Claude Estournès, Daniel Monceau, A.L. Carabat, W.G. Sloof, S. van der Zwaag, Philip J. Withers, Ping Xiao
DOI
help_outline
https://doi.org/10.1016/j.jeurceramsoc.2018.04.053
Mechanical properties Ceramic composites Life time extension Self – repairing materials Thermal barrier coatings (TBC)
More Info
expand_more

Published Date

2018

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Research Group

(OLD) MSE-1

Abstract

Yttria – partially stabilised zirconia (YPSZ) MoSi2 composites have been designed to prolong the lifetime of the matrix by self – healing cracks during thermal cycling. The healing reaction at high temperatures is based on the decomposition of MoSi2, leading to a volumetrically expanding reaction product, which seals the crack. In this work, coefficient of thermal expansion (CTE) and the fracture toughness of composites containing MoSi2 particles, produced by spark plasma sintering (SPS) have been compared to conventional YPSZ. The CTE mismatch between YPSZ and MoSi2 was found to be small, implying that thermally induced mismatch stresses will be small and the composites have a similar CTE to conventional YPSZ. Fracture toughness was found not to be affected by the particles and showed similar values to unreinforced YPSZ. Cracks introduced by indentation have been shown neither to prefer, or avoid, the particles suggesting that such a composite system is capable of autonomously activating the self – healing reaction.