Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
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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