Published December 25, 2015
| public
Journal Article
The interaction of calcium–magnesium–aluminosilicate with ytterbium silicate environmental barrier materials
Abstract
The interactions of two potential topcoat materials for environmental barrier coatings, Yb_2SiO_5 and Yb_2Si_2O_7, with calcium-magnesium-aluminosilicate (CMAS) engine deposits were studied. X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron diffraction were used to investigate the phase transformation associated with the exposure of Yb_2SiO_5 and Yb_2Si_2O_7 to CMAS at 1300 °C. It was found that Yb_2SiO_5 strongly reacts with CMAS to completely dissolve the Yb_2SiO_5 and form hexagonal Ca_2Yb_8(SiO_4)_6O_2 deposits. In contrast, no discernable reaction between CMAS and Yb_2Si_2O_7, was observed over the 96-h exposure.
Additional Information
© 2015 Elsevier B.V. Received 2 May 2015; Revised 15 August 2015; Accepted in revised form 17 August 2015; Available online 4 September 2015. This research was made possible by 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. SEM and FIB-SEM(FEI)were performed in the EPIC facility of NUANCE Center at Northwestern University. NUANCE Center is supported by NSF-NSEC, NSF-MRSEC, Keck Foundation, the State of Illinois, and Northwestern University. X-ray diffraction experiments were performed at the Cohen X-ray Lab at Northwestern University. The Cohen X-ray Facility is supported by NSF-MRSEC. A Northwestern University Terminal Year Fellowship provided partial support for F.S.Additional details
- Eprint ID
- 64229
- DOI
- 10.1016/j.surfcoat.2015.08.069
- Resolver ID
- CaltechAUTHORS:20160204-125158377
- DE-AC02-06CH11357
- Department of Energy (DOE)
- DMR-1121262
- NSF
- W. M. Keck Foundation
- State of Illinois
- Northwestern University
- Created
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2016-02-04Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field