Embedding two dimensional Al<sub>2</sub>O<sub>3</sub> platelets array into YSZ ceramics for high-temperature applications.

Abstract

Two-dimensional (2D) materials, including graphene and MXenes, have garnered significant interest for enhancing both the mechanical and multifunctional properties of advanced structural ceramics. These materials encounter operational limitations under high temperatures, particularly due to oxidative degradation of 2D reinforcement architectures that induces composition instability and property deterioration. In this study, we developed a processing methodology for fabricating 2D Al₂O₃ platelet-reinforced yttria-stabilized zirconia (YSZ) composites, which can be stable up to 1300 ^oC in an atmosphere. Through a multi-field coupling strategy combining gravitational field modulation, high-intensity vibrational alignment, and controlled pressure densification, we achieved densified composites with parallel-aligned Al₂O₃ platelet array in YSZ matrix.‌ The composite demonstrates reduced near-infrared (NIR) transmittance below 10%, effectively blocking radiative thermal transfer. Meanwhile, The YSZ-Al₂O₃ platelet composite (YSZ-Al₂O₃-PL) simultaneously demonstrates enhanced resistance to CaO-MgO-AlO_1.5-SiO₂ (CMAS) molten salts and improved fracture toughness. The cost-effective 2D oxide/ceramic composites possess exceptional thermo-mechanical stability, promising for harsh environments.