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Transmission electron microscope characterization of a plasma-sprayed ZrO2-Y2O3-TiO2 thermal barrier coating

Diaz, P; Ralph, B; Edirisinghe, MJ; (1998) Transmission electron microscope characterization of a plasma-sprayed ZrO2-Y2O3-TiO2 thermal barrier coating. MATER CHARACT , 41 (2-3) 55 - 67.

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Abstract

Some microstructural elements, such as microtwins in tetragonal ZrO2 grains (t-ZrO2), were identified in a plasma-sprayed ZrO2-Y2O3-TiO2 coating by using transmission electron microscopy. These elements are similar to those described in plasma-sprayed ZrO2-Y2O3 coatings and are characteristic of nontransformable t-ZrO2. This microstructure could promote some toughening mechanisms. The monoclinic ZrO2 phase (m-ZrO2), produced by a martensitic transformation of the metastable t-ZrO2 phase, also was observed. The variation in the concentration of Ti in the ZrO2-Y2O3-TiO2 coating body was found to be appreciable. The energy-dispersive spectroscopic analyses showed that a high concentration of Ti was associated with t-ZrO2 whereas a relatively lower content of Ti was found in m-ZrO2. ZrO2-Y2O3-TiO2 thermally treated at 1400 and 1600 degrees C showed signs of grain growth. A higher incidence of m- and t-ZrO2 twins indicated higher constraints of the polycrystalline structure as a result of the grain growth and rapid cooling rate. (C) Elsevier Science Inc., 1998.

Type: Article
Title: Transmission electron microscope characterization of a plasma-sprayed ZrO2-Y2O3-TiO2 thermal barrier coating
Keywords: ZIRCONIA, TRANSFORMATION, MICROSTRUCTURE, CERAMICS
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
URI: http://discovery.ucl.ac.uk/id/eprint/105879
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