Mullite–YSZ multilayered environmental barrier coatings tested in cycling conditions under water vapor atmosphere

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DOIResolve DOI: http://doi.org/10.1016/j.surfcoat.2012.08.044
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TypeArticle
Journal titleSurface and Coatings Technology
ISSN0257-8972
Volume209
Pages103109; # of pages: 7
SubjectPlasma spraying; Environmental barrier coatings (EBCs); Water vapor corrosion; Mullite; ZrO₂
AbstractPlasma sprayed mullite/YSZ graded coatings on SiC substrates were examined as environmental barrier coatings (EBCs). Several coating systems with various layer arrangements were subjected to thermal aging at 1300°C in cycling (50 and 100 cycles, i.e. 100 and 200 h) conditions under rich water vapor atmosphere. The level of porosity and the crack population were quantified using cross section SEM images of these coatings. The thickness of the thermally grown silica (TGS) layer developed was estimated and the presence of cristobalite in its structure was evidenced by micro-Raman spectroscopy. Hardness and elastic modulus were also determined by the use of instrumented indentation for each layer in the different coatings. The evolution of all these parameters confirmed that EBC architectures formed by compliant porous layers resulted more effective in reducing cracks and the effects of aging than EBCs with dense graded compositions.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationAutomotive; National Research Council Canada
Peer reviewedYes
NRC number140243
NPARC number21268111
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Record identifierfd17031c-5832-4e4a-9590-3bbc882f08f1
Record created2013-04-12
Record modified2016-05-09
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