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Published February 15, 2016 | public
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The influence of calcium–magnesium–aluminosilicate deposits on internal stresses in Yb_2Si_2O_7 multilayer environmental barrier coatings

Stolzenburg, F.
Kenesei, P.
Almer, J.
Lee, K. N.
Johnson, M. T. ORCID icon
Faber, K. T. ORCID icon
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Abstract

The interaction of calcium-magnesium-aluminosilicates (CMAS) with Yb_2Si_2O_7-based multilayer environmental barrier coatings was studied using a combination of high-energy synchrotron X-ray techniques. Changes in the phase-specific stresses and lattice spacings as a function of temperature were investigated with wide-angle X-ray scattering. Small-angle X-ray scattering was used to study the interaction of CMAS with nanoporosity, while X-ray computed tomography was used to study the formation of cracks in the coating. It was found that CMAS interacts strongly with the Yb_2Si_2O_7 topcoat, leading to changes in lattice spacing, alterations of the ambient temperature stresses, and large cracks in the CMAS that extend through the topcoat.

Additional Information

© 2015 Acta Materialia Inc. Published by Elsevier Ltd. Received 6 August 2014, Revised 3 November 2015, Accepted 7 December 2015, Available online 24 December 2015. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. This work made use of the OMM Facility supported by the MRSEC program of the National Science Foundation (DMR-1121262) at the Materials Research Center of Northwestern University. A Northwestern University Terminal Year Fellowship provided partial support for F.S.

Additional details

Additional titles Identifiers Funding Dates
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August 22, 2023
Modified:
October 17, 2023