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A sputtered zirconia primer for improved thermal shock resistance of plasma-sprayed ceramic turbine sealsIt is shown that the application of sputtered Y2O3-stabilized ZrO2 (YSZ) primer in plasma-sprayed YSZ ceramic-coated turbine blades results in an improvement, by a factor of 5-6, in the thermal shock life of specimens with a sprayed, porous, Ni-Cr-Al-Y intermediate layer. Species with and without the primer were found to be able to survive 1000 cycles when the intermediate layer was used, but reduced laminar cracking was observed in the specimen with the primer. It is suggested that the sputtered YZS primer-induced properties are due to (1) more effective wetting and adherence of the plasma-sprayed YZS particles to the primer, and (2) the primer's retardation of impinging, molten plasma sprayed particles solidification rates, which result in a less detrimental residual stress distribution.
Document ID
19820039702
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bill, R. C.
(NASA Lewis Research Center; U.S. Army, Aviation Research and Development Command, Cleveland OH, United States)
Sovey, J.
Allen, G. P.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1981
Subject Category
Nonmetallic Materials
Accession Number
82A23237
Distribution Limits
Public
Copyright
Other

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