Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 6, Pages 2223-2230Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.11.066
Keywords
Electron microscopy; Ceramics; Oxidation; Thermal barrier coatings; Yttria stabilized zirconia (YSZ); Thermal grown oxide (TGO)
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Funding
- DOE [DE-FG-26-08NT001471]
- Louisiana Clean Power and Energy Research Consortium (CPERC)
- National Science Foundation
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The results of an experimental study of the high-temperature isothermal oxidation behavior and microstructural evolution in two variations of air plasma sprayed ceramic thermal barrier coatings (TBCs) are discussed in the paper. Two types of TBC specimens were produced for testing. These include a standard and vertically cracked APS. High temperature oxidation was carried out at 900, 1000, 1100 and 1200 degrees C. The experiments were performed in air under isothermal conditions. At each temperature, the specimens were exposed for 25, 50, 75 and 100 h. The corresponding microstructures and microchemistries of the TBC layers were examined using scanning electron microscopy and energy dispersive X-ray spectroscopy. Changes in the dimensions of the thermally grown oxide layer were determined as functions of time and temperature. The evolution of bond coat microstructures/interdiffusion zones and thermally grown oxide layers were compared in the TBC specimens with standard and vertically cracked microstructures. (C) 2010 Elsevier B.V. All rights reserved.
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