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Stresses in Ytterbium Silicate Multilayer Environmental Barrier Coatings

Stolzenburg, F. and Almer, J. and Lee, K. N. and Harder, B. J. and Faber, K. T. (2011) Stresses in Ytterbium Silicate Multilayer Environmental Barrier Coatings. In: Denver X-ray Conference (DXC 2011), 2011, Denver, CO.

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The internal stresses of plasma-sprayed multilayer ytterbium disilicate environmental barrier coatings were measured using microfocused high-energy X-rays in a transmission geometry. Stresses were measured for as-sprayed and ex-situ heat-treated ytterbium disilicate topcoats at room temperature and during in-situ heating and cooling experiments. In-situ loading experiments were also performed on the topcoat in order to establish its elastic constants. The ytterbium disilicate was found to have a relatively low coefficient of thermal expansion resulting in compressive stresses of approximately 100 MPa throughout the topcoat. In-situ heating experiments revealed a statistically significant stress relaxation in the ytterbium disilicate topcoat upon thermal cycling to temperatures above 1300°C, indicating the onset of stress relaxation but no cracks were observed in SEM micrographs. The stress states were also modeled using a numerical solution; measured stresses were found to be very close to the predicted stresses in ytterbium dilisicate topcoats, while the experimentally determined stresses in the intermediate layers were of much smaller magnitude than the calculated stresses.

Item Type:Conference or Workshop Item (Paper)
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Faber, K. T.0000-0001-6585-2536
Additional Information:© 2011 JCPDS - International Centre for Diffraction Data. Research funding and use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357.
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Department of Energy (DOE)DE-AC02-06CH11357
Record Number:CaltechAUTHORS:20140912-093131896
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49650
Deposited By: George Porter
Deposited On:12 Sep 2014 21:40
Last Modified:03 Mar 2020 13:01

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