Dry air cyclic oxidation of mixed Y/Yb disilicate environmental barrier coatings and bare silica formers

Stack, Padraig; Kane, Kenneth A.; Sweet, M.; Parker, Cory G; Lance, Michael J.; Pint, Bruce A.

doi:10.1016/j.jeurceramsoc.2022.02.009

Title: Dry air cyclic oxidation of mixed Y/Yb disilicate environmental barrier coatings and bare silica formers

Journal Article · 03 February 2022 · Journal of the European Ceramic Society

DOI: https://doi.org/10.1016/j.jeurceramsoc.2022.02.009 · OSTI ID:1854453

Stack, Padraig ^[1]; Kane, Kenneth A. ^[2]; Sweet, M. ^[3]; Parker, Cory G ^[2];

^[2];

^[2]

Univ. of Akron, OH (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Praxair Surface Technologies, Indianapolis, IN (United States)

Here mixed Y and Yb disilicate coatings (Y/Yb)DS have been proposed as dual function thermal and environmental barrier coatings (EBCs) for protecting SiC-based ceramic matrix composites in gas-turbine environments. As an initial step, the 1350 °C dry air cyclic oxidation of atmospheric plasma sprayed (Y_1.2/Yb_0.8)DS and ytterbium disilicate/ytterbium monosilicate (YbDS/YbMS) EBCs deposited onto Si bond coatings was compared. As a baseline for evaluating EBC oxidant permeability, the dry air cyclic oxidation scale growth rates for bare silica formers (SiC, Si) were also measured and were consistently higher than rates previously measured after isothermal oxidation. Regarding Si bond coat oxidation rates underlying (Y/Yb)DS and YbDS/YbMS EBCs, the thinner silica scale formed under the thinner and denser (Y/Yb)DS coatings suggested a lower oxidant permeability than YbDS/YbMS. After 500 1-h cycles, the (Y/Yb)DS coating was comprised of only the β-polymorph disilicate and minor amounts of the X-2 phase monosilicate phase. Negligible differences in oxidation kinetics for (Y/Yb)DS coatings over the 90 – 240 µm thickness range were observed.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1854453

Journal Information:: Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 7 Vol. 42; ISSN 0955-2219

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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