Mechanisms of Degradation and Failure in a Plasma-Deposited Thermal Barrier Coating

[+] Author and Article Information
J. T. DeMasi-Marcin, K. D. Sheffler, S. Bose

Pratt & Whitney Materials Engineering, E. Hartford, CT 06108

J. Eng. Gas Turbines Power 112(4), 521-526 (Oct 01, 1990) (6 pages) doi:10.1115/1.2906198 History: Received January 23, 1989; Online April 24, 2008


Failure of a two-layer plasma-deposited thermal barrier coating is caused by cyclic thermal exposure and occurs by spallation of the outer ceramic layer. Spallation life is quantitatively predictable, based on the severity of cyclic thermal exposure. This paper describes and attempts to explain unusual constitutive behavior observed in the insulative ceramic coating layer, and presents details of the ceramic cracking damage accumulation process, which is responsible for spallation failure. Comments also are offered to rationalize the previously documented influence of interfacial oxidation on ceramic damage accumulation and spallation life.

Copyright © 1990 by The American Society of Mechanical Engineers
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