Journal
SCRIPTA MATERIALIA
Volume 126, Issue -, Pages 24-28Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2016.08.019
Keywords
Thermal barrier coatings; RETaO4 ceramic; Raman spectroscopy; Thermal conductivity; Vickers hardness
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Funding
- Kunming University of Science and Technology [11504146]
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The RETaO4 ceramics with low-thermal conductivity were fabricated using a solid-state reaction. The phase composition and microstructures of high-temperature RETaO4 (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) ceramics were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman spectroscopy. The RETaO4 ceramics had lower thermal conductivity (138 to 1.94 W.m(-1).K-1 at 800 degrees C) than 7-8YSZ (2.37 and 2.47 W.m(-1).K-1 at 800 degrees C, respectively). The porosity significantly affected the thermal conductivity of RETaO4 ceramics. The RETaO4 ceramics also had lower Vickers hardness than 8YSZ, which suggests that RETaO4 has better fracture toughness and thermal tolerance. (C) 2016 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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