Journal
SURFACE & COATINGS TECHNOLOGY
Volume 205, Issue 10, Pages 3293-3300Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2010.11.059
Keywords
Thermal barrier coatings; Magnetoplumbite; Zirconia; Plasma spraying; Thermal cycling
Funding
- Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation (Changsha University of Science Technology)
- [NSFC-50825204]
- [NSFC-20921002]
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New LaMgAl11O19 (LaMA)/YSZ double ceramic top coat thermal barrier coatings (TBCs) with the potential application in advanced gas-turbines and diesel engines to realize improved efficiency and durability were prepared by plasma spraying, and their thermal cycling failure were investigated. The microstructure evolutions as well as the crystal chemistry characteristics of LaMA coating which seemed to have strong influences on the thermal cycling failure of LaMA and the new double ceramic top coat TBCs based on LaMA/YSZ system were studied. For double ceramic top coat TBC system, interface modification of LaMA/YSZ by preparing thin composite coatings seemed to be more preferred due to the formations of multiple cracks during thermal cycling making the TBC to be more strain tolerant and as well as resulting in an improved thermal cycling property. The effects of the TGO stresses on the failure behavior of the TBCs were discussed through fluorescence piezo-spectroscopy analysis. (C) 2010 Elsevier B.V. All rights reserved.
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