Microstructure and thermal properties of RETaO4 (RE=Nd, Eu, Gd, Dy, Er, Yb, Lu) as promising thermal barrier coating materials

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 sp...

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Bibliographic Details
Published in:Scripta materialia 2017-01, Vol.126, p.24-28
Main Authors: Wang, Jun, Chong, XiaoYu, Zhou, Rong, Feng, Jing
Format: Article
Language:English
Subjects:
Ceramics
Diamond pyramid hardness
Erbium
Heat transfer
Microstructure
Raman spectroscopy
RETaO4 ceramic
Scanning electron microscopy
Thermal barrier coatings
Thermal conductivity
Thermal properties
Vickers hardness
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Summary: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 (1.38 to 1.94W·m−1·K-1 at 800°C) than 7-8YSZ (2.37 and 2.47W·m−1·K−1 at 800°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. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.08.019