期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 34, 期 11, 页码 2687-2694出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2014.01.002
关键词
Thermal barrier coatings; Sintering; Delamination; Fracture; Air plasma sprayed coating
资金
- Engineering and Physical Sciences Research Council [EP/G004676/1] Funding Source: researchfish
- EPSRC [EP/G004676/1] Funding Source: UKRI
The spallation resistance of an air plasma sprayed (APS) thermal barrier coating (TBC) to cool-down/reheat is evaluated for a pre-existing delamination crack. The delamination emanates from a vertical crack through the coating and resides at the interface between coating and underlying thermally grown oxide layer (TGO). The coating progressively sinters during engine operation, and this leads to a depth-dependent increase in modulus. Following high temperature exposure, the coating is subjected to a cooling/reheating cycle representative of engine shut-down and start-up. The interfacial stress intensity factors are calculated for the delamination crack over this thermal cycle and are compared with the mode-dependent fracture toughness of the interface between sintered APS and TGO. The study reveals the role played by microstructural evolution during sintering in dictating the spallation life of the thermal bather coating, and also describes a test method for the measurement of delamination toughness of a thin coating. (C) 2014 Elsevier Ltd. All rights reserved.
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