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Microstructure and thermophysical properties of CeO2-doped SmTaO4 ceramics for thermal barrier coatings

Published online by Cambridge University Press:  27 January 2020

Ying Zhou Open the ORCID record for Ying Zhou [Opens in a new window] ,
Guoyou Gan ,
Zhenhua Ge ,
Peng Song  and
Jing Feng
Ying Zhou*
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People's Republic of China Yunnan Provincial Academy of Science and Technology, Kunming 650093, People's Republic of China
Guoyou Gan
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People's Republic of China
Zhenhua Ge
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People's Republic of China
Peng Song
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People's Republic of China
Jing Feng
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

SmTaO4 ceramics have excellent high-temperature phase stabilities and mechanical properties and show great potential for use as next-generation thermal barrier coating (TBC) materials. CeO2–SmTaO4 ceramics are prepared via high-temperature solid–state reaction. It retains a single monoclinic phase structure. Ce4+ was reduced to Ce3+ by high-temperature deoxidation, and the Ce3+ ions substitute for an equal number of Sm3+ ions. The CeO2–SmTaO4 ceramics had lower thermal conductivities [1.09–2.75 W/(m K)] than yttria-stabilized zirconia (YSZ) [2.1–2.7 W/(m K)] at 100–800 °C, which decreased dramatically with increasing temperature. SmTaO4 doped with 2% CeO2 had lower thermal conductivity [1.09 W/(m K), 800 °C] than SmTaO4 [1.42 W/(m K), 800 °C] and 2% ZrO2-doped SmTaO4 ceramics [1.22 W/(m K), 800 °C]. The low thermal conductivity is attributed to Ce3+ substitution for an equal number of Sm3+ ions, and because Ce3+ ions are the strongest phonon scattering centers, they can decrease the phonon mean free path effectively. The thermal expansion coefficient of 8% CeO2–SmTaO4 ceramics is approximately 10.3 × 10−6 K−1 at 1200 °C, which is slightly higher than that of both YSZ (10.0 × 10−6 K−1) and SmTaO4 (9.58 × 10−6 K−1). The outstanding thermophysical properties indicate that CeO2–SmTaO4 ceramics are potential TBC materials.

Keywords

CeO2–SmTaO4 ceramicsTBCsthermophysical propertiesthermal conductivity
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 3 , 14 February 2020 , pp. 242 - 251
Copyright
Copyright © Materials Research Society 2020

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