CaltechAUTHORS
Published February 15, 2016 | Version public
Journal Article Metadata-only

The influence of calcium–magnesium–aluminosilicate deposits on internal stresses in Yb_2Si_2O_7 multilayer environmental barrier coatings

Creators

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

Alternative title
The influence of calcium–magnesium–aluminosilicate deposits on internal stresses in Yb2Si2O7 multilayer environmental barrier coatings

Identifiers

Eprint ID
65028
Resolver ID
CaltechAUTHORS:20160303-131553645

Funding

Department of Energy (DOE)
DE-AC02-06CH11357
NSF
DMR-1121262
Northwestern University

Dates

Created
2016-03-04
Created from EPrint's datestamp field
Updated
2021-11-10
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