Environmental barrier coatings on enhanced roughness SiC: Effect of plasma spraying conditions on properties and performance

Ridley, Mackenzie; Garcia, Eugenio; Kane, Kenneth; Sampath, Sanjay; Pint, Bruce

doi:10.1016/j.jeurceramsoc.2023.06.049

Environmental barrier coatings on enhanced roughness SiC: Effect of plasma spraying conditions on properties and performance

Journal Article · Wed Jul 19 00:00:00 EDT 2023 · Journal of the European Ceramic Society

DOI:https://doi.org/10.1016/j.jeurceramsoc.2023.06.049· OSTI ID:1994697

^[1]; Garcia, Eugenio ^[2]; ^[1]; ^[2]; ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Stony Brook Univ., NY (United States)

Environmental barrier coatings for SiC/SiC composites are limited by the melting temperature of the Si bond coating near 1414°C. Systems without a bond coating may be required for future turbine applications where material temperatures go beyond 1350 °C. Here, enhanced roughness SiC substrates were developed to assess coating adhesion without the bond coating. Two EBCs with different YbMS/YbDS ratios were produced via modified plasma spraying parameters. Coating microstructure, thermal expansion, and modulus were measured for comparison of coating properties. Cyclic steam exposures at 1350°C were performed to assess oxidation resistance. The EBC with increased concentration of Yb₂SiO₅ secondary phase displayed a higher CTE, which is typically expected to decrease adhesion lifetimes due to an increase in stress upon thermal cycling. Yet, the EBC chemistry with increased Yb₂SiO₅ concentration was able to experience longer cycling times prior to coating delamination, likely due to interface interactions with the substrate and the thermally grown oxide.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1994697

Alternate ID(s):: OSTI ID: 1999825

Journal Information:: Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 14 Vol. 43; ISSN 0955-2219

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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