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Mechanical and thermal properties of RETaO4 (RE = Yb, Lu, Sc) ceramics with monoclinic-prime phase.
- Source :
- Journal of Materials Science & Technology; Sep2020, Vol. 52, p20-28, 9p
- Publication Year :
- 2020
-
Abstract
- As candidate thermal/environmental barrier coatings (T/EBCs), the structure characteristics and comprehensive properties of monoclinic-prime (m') RETaO 4 (RE = Yb, Lu, Sc) with excellent Al 2 O 3 /SiO 2 chemical compatibility are studied. Excellent thermal insulation protection will be provided by m'RETaO 4 due to their low thermal conductivity (∼1.6 W m<superscript>−1</superscript> K<superscript>−1</superscript>, 900 °C) and prominent thermal radiation resistance, which is much better than those of YSZ (∼2.5 W m<superscript>−1</superscript> K<superscript>−1</superscript>, 1000 °C) and La 2 Zr 2 O 7 (∼2.0 W m<superscript>−1</superscript> K<superscript>−1</superscript>, 900 °C). The thermal expansion coefficients (TECs) are 3.0–8.0 × 10<superscript>-6</superscript> K<superscript>−1</superscript> (200−1200 °C), which is suitable for T/EBCs applications. Furthermore, absence of phase transition and extraordinary chemical compatibility with Al 2 O 3 /SiO 2 up to 1500 °C indicate the potential application prospect. The documented governing mechanisms of m'RETaO 4 properties will enable researchers to promote their application in the future investigation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10050302
- Volume :
- 52
- Database :
- Supplemental Index
- Journal :
- Journal of Materials Science & Technology
- Publication Type :
- Periodical
- Accession number :
- 144279942
- Full Text :
- https://doi.org/10.1016/j.jmst.2020.02.051