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Phase Identification in Heated Thermal Barrier Coatings using Microbeam X-ray Diffraction Combined with Quantitative X-ray Mapping

Published online by Cambridge University Press:  17 March 2011

Jennifer R. Verkouteren ,
Ryna B. Marinenko  and
David S. Bright
Jennifer R. Verkouteren
Affiliation:
Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, U.S.A.
Ryna B. Marinenko
Affiliation:
Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, U.S.A.
David S. Bright
Affiliation:
Chemical Science and Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, U.S.A.
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Abstract

Phase evolution in a yttria-partially-stabilized zirconia (Y-PSZ) thermal barrier coating (TBC) was studied by using quantitative electron probe x-ray mapping combined with microbeam x-ray diffraction. The as-sprayed coating contains a single t' phase with the composition of the feedstock material. After annealing at 1400 °C for 1 hour, the yttria content of the t' phase increases slightly to compensate for the formation of 0.06 mass fraction of a t phase containing 0.01 mole fraction YO1.5. These results are in contrast to those determined by bulk x-ray and neutron diffraction, and therefore highlight the need for multiple techniques of phase analysis in Y-PSZ.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 645: Symposium M – Thermal Barrier Coatings-2000 , 2000 , MM8.4.1
Copyright
Copyright © Materials Research Society 2001

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References

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