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RESEARCH PAPERS

Thermal Fracture of Multilayer Ceramic Thermal Barrier Coatings

[+] Author and Article Information
Y. R. Takeuchi, K. Kokini

Purdue University, Ray W. Herrick Laboratories, School of Mechanical Engineering, West Lafayette, IN 47907

J. Eng. Gas Turbines Power 116(1), 266-271 (Jan 01, 1994) (6 pages) doi:10.1115/1.2906803 History: Received February 24, 1992; Online April 24, 2008

Abstract

Controlled experiments and a corresponding analytical model were developed to investigate the reasons for crack initiation in multilayer ceramic thermal barrier coatings. The experiments and model determined that surface cracks form as a result of tensile stresses created following stress relaxation in the ceramic at steady-state high temperatures (about 900°C–1100°C). Interface cracks generated by out-of-plane stresses are affected by the presence of these surface cracks and thermal transients and, possibly, edge effects.

Copyright © 1994 by The American Society of Mechanical Engineers
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