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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)
Type
Article
Information
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
Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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