Metaceramic enables ultrahigh-temperature record rectification and programmable 3D thermal control

Area of Science:

• Materials Science
• Thermodynamics
• Nanotechnology

Background:

• Thermal rectification is crucial for thermal management, but practical devices face limitations in high-temperature stability and rectification efficiency.
• Conventional rectifiers operate below 900 K with ratios under 3.5, hindering applications in extreme environments.

Purpose of the Study:

• To develop a material overcoming the trade-off between high-temperature stability and nonlinear thermal response for thermal rectification.
• To present a novel metaceramic capable of efficient thermal management under extreme conditions.

Main Methods:

• Architecting a monolithic metamaterial ceramic (metaceramic) with multiscale graded porosity.
• Integrating four nonlinear heat transfer mechanisms: ion-tailored conduction, cavity-modulated radiation, chaotic advection-enhanced convection, and spontaneous convective dissipation.

Main Results:

• Achieved a record thermal rectification ratio of 8.5 at 2473 K, exceeding previous benchmarks by over 140%.
• Demonstrated a triaxial ultrahigh-temperature rectifier with programmable, volumetric thermal flow control, extending rectification to a tensor-like property.

Conclusions:

• The metaceramic design overcomes the classical stability-nonlinearity conflict in thermal rectifiers.
• This metamaterials platform enables breaking thermal reciprocity under extreme conditions, with applications in hypersonic systems, spacecraft, and energy technologies.