Abstract
Dimensions and thermal insulation properties of nanoporous ceramics are unstable at high temperatures due to structural disruptions. This work prepared high entropy (LaCeSmEuNd)2Zr2O7 ceramic aerogel via non-alkoxide sol-gel, supercritical drying, and calcination. XRD and EDS analysis showed that the (LaCeSmEuNd)2Zr2O7 ceramic existed as a single phase. SEM images demonstrated the successful synthesis of aerogel structure. After two hours of annealing at 1200 °C, the cylindrical sample pressed from (LaCeSmEuNd)2Zr2O7 ceramic aerogel had a compressive strength of 58.75 MPa, and its diameter shrinkage was 0.56%, whereas the La2Zr2O7 reached 13.68%. The thermal diffusivity of annealed (LaCeSmEuNd)2Zr2O7 was as low as 0.119 mm2 s−1, and its thermal conductivity at room temperature was 0.073 W·m−1 K−1, which was attributed to lattice disorder, stable porous structure, and abundance of grain boundaries caused by high entropy effects. Extending the high entropy effect to ceramic nano-insulation products is beneficial for enhancing their thermal stability.
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