TECHNICAL PAPERS: Gas Turbines: Manufacturing, Materials, and Metallurgy

Delamination Cracking in Thermal Barrier Coating System

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

Fracture Research Institute, Tohoku University, Sendai 980-8579, Japan and Institute of Fundamental Mechanics and Materials Engineering, Xiangtan University, Xiangtan, Hunan 411105, P. R. Chinae-mail: zhou@rift.mech.tohoku.ac.jp

T. Hashida

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

J. Eng. Gas Turbines Power 124(4), 922-930 (Sep 24, 2002) (9 pages) doi:10.1115/1.1477194 History: Received July 01, 2000; Revised September 01, 2001; Online September 24, 2002
Copyright © 2002 by ASME
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Conventions and geometry for the analysis of delamination cracking in the TBC system; (a) the delamination cracking in the TBC system is induced by the membrane stresses Pi(i=1,2,3) and bending moments Mi(i=1,2,3), (b) the failure of the TBC system can be induced by equivalent loads P and M
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Scheme of the analytical model for thermal stresses fields in the TBC system operating at high temperature
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SEM micrographs showing interface delamination cracking for thermal barrier ceramic coating subjected to six thermal fatigue cycles, where the exposed time for every cycle was 70 s and the highest temperature on the coating and substrate was 1200°C and 600°C, respectively
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Boundary conditions of temperature for the TBC system at the typical operating state
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Histories of membrane stresses; (a) original membrane stresses P1 and P3, (b) equivalent membrane stresses P
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Histories of bending moments; (a) original bending moments M1 and M3, (b) equivalent bending moments M
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TSIFs Ki,KI, and KII as a function of temperature on the interface of bimaterials, where the original loads P1=−7.0 MPa.cm,M1=−7.0×10−3 MPa.cm2,P3=4.0 MPa.cm, and M3=−1.0 MPa.cm2
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Dundurs’ parameters ᾱ and β̄ as a function of temperature on the interface of bimaterials
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Histories of TSIFs in TBC coating system; (a) Ni-alloy substrate, (b) steel substrate




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