Journal
SCRIPTA MATERIALIA
Volume 62, Issue 5, Pages 282-285Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2009.11.019
Keywords
Electron backscattered diffraction (EBSD); Crystallization; Plasma spraying; Coating; Phase transformation kinetics
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Funding
- Department of Energy, Office of Basic Energy Science [DE-AC02-06CH11357]
- National Science Foundation [DMR-0520513]
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The hexacelsian-to-celsian phase transformation in Ba1-xSrxAl2Si2O8 is of interest for environmental barrier coating applications. Plasma-sprayed microstructures were heat treated above 1100 degrees C and the kinetics of the hexacelsian-to-celsian transformation were quantified. Activation energies for bulk and crushed materials were determined to be similar to 340 and similar to 500 kJ mol(-1), respectively. X-ray diffraction and electron backscattered diffraction were used to establish how plasma spraying barium- and strontium-doped aluminosilicate effectively reduces the energy required for its transformation. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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