Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 276, Issue 1-2, Pages 1-8Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(99)00576-6
Keywords
EB-PVD; thermal barrier coating; zirconia; texture; TEM; microstructure
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The electron beam physical vapor deposition process (EB-PVD) provides distinctive coatings of a unique columnar microstructure for gas turbine components. The main advantage of this microstructure is its superior tolerance against stresses, erosion and thermoshock, thus giving it a major edge in lifetime. This paper describes recent investigations of microstructure and texture of yttria-partially stabilized zirconia (Y-PSZ) thermal barrier coatings. Close to the substrate a thin zone of varying thickness consisting of equiaxed ZrO2 grains is observed which can be explained by a geometrical model. A fourfold texture is formed on rotated substrates via evolutionary selection of the fastest growth directions. Rotation causes a layered structure of bent columns. Texture and morphology of the coatings are drastically changed under stationary deposition conditions. (C) 2000 Elsevier Science S.A. All rights reserved.
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