Improving thermal insulating properties through the synthesis of high entropy oxide in A2Zr2O7 structures
Myeungwoo Ryu a, Myungju Woo a, Seunggun Choi a, Ganggyu Lee a, Seungcheol Myeong a, Yongmin Jung a, Taeseup Song a
a Department of Energy Engineering, Hanyang University, Seoul, Republic of Korea, 04763
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
#GreenE - Advances in Green Energy Carriers
VALÈNCIA, Spain, 2023 March 6th - 10th
Organizers: Taeseup Song and Ungyu Paik
Poster, Myeungwoo Ryu, 273
Publication date: 22nd December 2022

Thermal barrier coating (TBC) is a system to protect components of gas turbines or aviation engines operating at a high temperature above 1200 oC. Ceramic materials with low thermal conductivity and outstanding thermal durability above have been employed as TBC materials. Yttria-stabilized zirconia (YSZ) is conventionally used as a TBC material. However, there is increasing demand for thermal insulating material applicable in a higher operating temperature above 1200 oC for higher thermal conversion efficiency. In this study, synthesized ceramics of high-entropy A2Zr2O7 incorporated five cations of a similar ionic radius into the A3+ cation site, and their excellent thermophysical properties demonstrate. The high-entropy A2Zr2O7 shows overall low thermal conductivity due to inducing lattice distortion in the structure. In addition, divalent cations were added to the A3+ cation site to raise the oxygen vacancy at the structure, thereby controlling the thermal transfer caused by phonon. HEOs show enhanced thermal insulating performance than conventional yttria-stabilized zirconia (YSZ), demonstrating the feasibility of application as next-generation TBC materials.

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