Embedding two dimensional Al₂O₃ platelets array into YSZ ceramics for high-temperature applications

Area of Science:

• Materials Science
• Ceramic Engineering
• Nanotechnology

Background:

• Advanced structural ceramics benefit from 2D materials like graphene and MXenes.
• High operational temperatures cause oxidative degradation in 2D reinforcements, leading to instability.
• Existing materials face limitations in extreme thermal conditions.

Purpose of the Study:

• To develop a processing methodology for 2D Al2O3 platelet-reinforced YSZ composites.
• To achieve high-temperature stability (up to 1300°C) in a specific atmosphere.
• To enhance mechanical and multifunctional properties of structural ceramics.

Main Methods:

• Fabrication of 2D Al2O3 platelet-reinforced YSZ composites.
• Utilizing a multi-field coupling strategy: gravitational field modulation, vibrational alignment, and pressure densification.
• Achieving parallel alignment of Al2O3 platelets within the YSZ matrix.

Main Results:

• Composites stable up to 1300°C achieved.
• Near-infrared (NIR) transmittance reduced below 10%, blocking radiative heat transfer.
• Enhanced resistance to CaO-MgO-AlO1.5-SiO2 (CMAS) molten salts and improved fracture toughness observed.

Conclusions:

• The developed YSZ-Al2O3 platelet composite offers exceptional thermo-mechanical stability.
• Cost-effective 2D oxide/ceramic composites show promise for applications in harsh environments.
• The processing methodology enables fabrication of advanced ceramic composites with tailored properties.