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Phase distributions in plasma-sprayed zirconia-yttriaThe distribution of phases in plasma-sprayed zirconia-yttria has been determined over a range of yttria levels from 0 to 26.1 molpct YO(1.5) using room temperature X-ray diffractometry. Pure, plasma-sprayed zirconia is composed almost entirely of the monoclinic phase. At levels of yttria between 4 and 10 percent, a quenched-in tetragonal phase predominates, and at higher levels the cubic phase predominates. The phase distributions are compared with previously reported test lives of thermal barrier coatings formed from these materials. Regions of optimal lives were found to correlate with regions having high amounts of the tetragonal phase, small but nonzero amounts of the monoclinic phase, and little or none of the cubic phase. Possible relationships between phase composition and coating performance are discussed.
Document ID
19840036161
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Miller, R. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Garlick, R. G.
(NASA Lewis Research Center Cleveland, OH, United States)
Smialek, J. L.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1983
Publication Information
Publication: American Ceramic Society Bulletin
Volume: 62
ISSN: 0002-7812
Subject Category
Nonmetallic Materials
Accession Number
84A18948
Distribution Limits
Public
Copyright
Other

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