Mechanisms of degradation and failure in a plasma deposited thermal barrier coatingFailure 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.
Document ID
19900036775
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Demasi-Marcin, Jeanine T. (United Technologies Corp. East Hartford, CT, United States)
Sheffler, Keith D. (United Technologies Corp. East Hartford, CT, United States)
Bose, Sudhangshu (United Technologies Corp. Pratt and Whitney Group, East Hartford, CT, United States)