Journal
SCRIPTA MATERIALIA
Volume 163, Issue -, Pages 71-76Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.12.028
Keywords
CMAS repellent; Thermal barrier coatings; Plasma spray physical vapor deposition; Yttria-stabilized zirconia
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Funding
- Natural Science Foundation of China (NSFC) [51590894, 51425102, 51231001]
- LMU Munich's Institutional Strategy LMUexcellent within the framework of the German Excellence Initiative
- VolkswagenStiftung [89705]
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Optimization of the resistance of thermal barrier coatings (TBCs) to environmental particles is an area of considerable current research. Here, we present a novel methods, incorporating plasma spray physical vapor deposition (PS-PVD), in order to fabricate a novel yttria-stabilized zirconia (YSZ) TBC which is highly phobic (i.e. nonwettable) with respect to CaO-MgO-Al2O3-SiO2 (CMAS) particles. At 1250 degrees C CMAS particles form liquid droplets which are readily repelled by the TBC surface, diminishing adherence to and penetration into the TBC. This effectiveness of the TBC in resisting wetting by molten CMAS deposits is interpreted to result from its lotus-leaf-like dual-scale microstructure. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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