1. Improvement of thermal insulating performance via entropy-stabilization in rare-earth zirconate structures.
- Author
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Ryu, Myeungwoo, Song, Dowon, Kim, Chanho, Lyu, Guanlin, Jung, Yongmin, Lee, Hyungjun, Kim, Youngdae, Jung, Yeon-Gil, and Song, Taeseup
- Subjects
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CERAMICS , *THERMAL barrier coatings , *AERODYNAMIC heating , *CRYSTAL lattices , *THERMAL conductivity , *THERMAL efficiency - Abstract
Thermal barrier coating (TBC) materials employ ceramics with low thermal conductivity and excellent thermal durability. Recently, the gas turbine market has been increasing demand for a thermally insulating material applicable at higher operating temperatures above 1200 °C for greater thermal conversion efficiency. In this study, synthesized high-entropy A 2 Zr 2 O 7 zirconate ceramics incorporated five cations of a similar ionic radius into the A3+ cation site through a conventional solid-state reaction, and their superior thermophysical properties demonstrate. The HEO ceramics exhibited overall low thermal conductivity (from room temperature to 1000 °C) due to inducing lattice distortion in the crystal structure. In addition, divalent cations were added to the A3+ cation site to increase the oxygen vacancy at the structure, thereby suppressing the heat transfer caused by phonon. A 2 Zr 2 O 7 zirconate HEOs show enhanced thermal barrier performance than yttria-stabilized zirconia (YSZ), conventional TBC material, demonstrating a possibility of application as next-generation TBC materials. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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