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Effects of Porosity and Thermal Ageing on In-Plane Cracking Behavior of Thermal Barrier Coatings

Published online by Cambridge University Press:  17 March 2011

Z. Zhang ,
J. Kameda ,
A. H. Swanson ,
S. Sakurai  and
M. Sato
Z. Zhang
Affiliation:
Ames Laboratory, Iowa State University, Ames IA 5011, USA
J. Kameda
Affiliation:
Ames Laboratory, Iowa State University, Ames IA 5011, USA Office of Naval Research International Field Office, Tokyo 106, Japan
A. H. Swanson
Affiliation:
Ames Laboratory, Iowa State University, Ames IA 5011, USA
S. Sakurai
Affiliation:
Hitachi Works, Hitachi Ltd., Hitachi 317, Japan
M. Sato
Affiliation:
Tohoku Electric Power Co., Sendai 980, Japan
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Abstract

This paper describes the effects of porosity and thermal ageing at 950°C for 4000 hr. in air on in-plane cracking behavior of plasma-sprayed thermal barrier coating (TBC) made up of 8 % yittria-stabilized zirconia. The in-plane TBC cracking was analyzed by a protruded TBC bend testing technique together with finite element stress analysis. As-deposited and aged TBC protruded specimens showed a large variation of porosity depending on the location of specimen extraction. The critical local tensile stress (s) necessary for the initiation of in-plane cracks for each specimen with different porosity was determined using elastic moduli (E) estimated from the porosity dependence of E. The s for in-plane cracking of the as-deposited TBC initially increased with increasing porosity and showed a peak when the porosity reached 0.23. It was shown that in-plane cracking at the interface of TBC and thermally grown oxides required much higher s than that at the interface of TBC and bond coatings. The thermal ageing led to a slight increase in s for away-from-interfacial TBC cracking. The dependence of in-plane TBC cracking behavior on the porosity is discussed in terms of effective critical stress via the Griffith criterion for porous materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 697: Symposium P – Surface Engineering 2001--Fundamentals and Applications , January 2001 , P4.4
Copyright
Copyright © Materials Research Society 2002

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