Determination of Interface Fracture Toughness in Thermal Barrier Coating System by Blister Tests

[+] Author and Article Information
Y. C. Zhou

Fracture Research Institute, Tohoku University, Sendai 980-8579, JapanInstitute of Fundamental Mechanics and Material Engineering, Xiangtan University, Xiangtan, Hunan, 411105, P. R. China

T. Hashida, C. Y. Jian

Fracture Research Institute, Tohoku University, Sendai 980-8579, Japan

J. Eng. Mater. Technol 125(2), 176-182 (Apr 04, 2003) (7 pages) doi:10.1115/1.1555658 History: Received February 07, 2001; Revised May 29, 2002; Online April 04, 2003
Copyright © 2003 by ASME
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Configuration for the test as an experimental procedure for interface toughness measurement
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Variation of mode mixty parameter versus interface crack extension, where NO.1∼NO.9 indicates experimental order for type A coating, NO.10∼NO.12 indicate experimental order for type B coating
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Interface crack propagation curves, where NO.1∼NO.9 indicate experimental order for type A coating, NO.10∼12 indicates experimental order for type B coating
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Comparison of interface crack length determined by the compliance method and SEM observation
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Principles of compliance method with the construction of linearization for unloading-reloading cycle
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Oil pressure q versus the maximum deflection w(0) for the debonded coating
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SEM observation of interface crack induced by the blister test: (a) focusing on the interface crack tip, and (b) the full view of the interface crack
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Microstructure of PSZ coating layer with different porosity: (a) Type A, dense coating; and (b) Type B, porosity coating
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Schematic of experimental set-up for the blister test
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Specimen configuration and dimensions used for the blister test




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