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Identification of t' Phase in ZrO 2 ‐7.5 wt% Y 2 O 3 Thermal‐Barrier Coatings
Author(s) -
Muraleedharan Kuttanellur,
Subrahmanyam Jandhyala,
Bhaduri Sarit B.
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb05061.x
Subject(s) - thermal barrier coating , phase diagram , materials science , thermal stability , phase (matter) , coating , tetragonal crystal system , durability , diffraction , x ray crystallography , analytical chemistry (journal) , mineralogy , composite material , chemical engineering , chemistry , optics , physics , organic chemistry , chromatography , engineering
The presence of nontransformable tetragonal (t') phase in plasma‐sprayed ZrO 2 ‐Y 2 O 3 coatings enhances the stability of the coating during high‐temperature exposure. In this paper, we describe the importance and procedure for correctly identifying t’phase in X‐ray diffraction patterns of the as‐sprayed and heat‐treated coatings. The results agree with the phase diagram. We also point out that in the heat‐treated materials, the durability should be specified in terms of t'‐ZrO 2 .