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Molten calcium–magnesium–aluminosilicate interactions with ytterbium disilicate environmental barrier coating

Published online by Cambridge University Press:  14 August 2020

Valerie L. Wiesner Open the ORCID record for Valerie L. Wiesner [Opens in a new window] ,
Bryan J. Harder ,
Anita Garg  and
Narottam P. Bansal
Valerie L. Wiesner*
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA Advanced Materials and Processing Branch, NASA Langley Research Center, Hampton, Virginia23681, USA
Bryan J. Harder
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA
Anita Garg
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA University of Toledo, Toledo, Ohio43606, USA
Narottam P. Bansal
Affiliation:
Materials and Structures Division, NASA Glenn Research Center, Cleveland, Ohio44135, USA
*
a)Address all correspondence to this author. e-mail: valerie.l.wiesner@nasa.gov
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Abstract

Thermochemical interactions between calcium–magnesium–aluminosilicate (CMAS) glass and an environmental barrier coating of ytterbium disilicate (Yb2Si2O7) and ytterbium monosilicate (Yb2SiO5) were investigated. Top coats were deposited by plasma spray-physical vapor deposition onto silicon carbide substrates. CMAS powder was prepared as a glass and cast into a tape to yield a CMAS loading of ~29 mg/cm2. Samples were heat treated with CMAS at 1300 °C for 1–10 h or at 1400 °C for 1 h in air. Polished specimen cross-sections were characterized using scanning electron microscopy, X-ray diffraction, X-ray energy-dispersive spectroscopy, and transmission electron microscopy to evaluate resulting microstructures, phases, and compositions at CMAS/Yb2Si2O7 interfaces. Coatings exposed at 1300 °C—10 h and 1400 °C—1 h were fully infiltrated and compromised by CMAS. Dissolution of ytterbium silicate into molten CMAS followed by precipitation of cyclosilicate, silicocarnotite, and Yb2Si2O7 at 1300 °C and Yb2Si2O7 at 1400 °C enabled CMAS to effectively infiltrate top coats, rendering the predominantly Yb2Si2O7 coating ineffective at arresting molten CMAS degradation.

Keywords

glasscoatingenvironmentally protectivetransmission electron microscopy (TEM)

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Article
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Journal of Materials Research , Volume 35 , Issue 17: Focus Issue: Sand-phobic Thermal/Environmental Barrier Coatings for Gas Turbine Engines , 14 September 2020 , pp. 2346 - 2357
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Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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