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In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
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Area of Science:

  • Materials Science
  • Ceramic Engineering
  • Nanotechnology

Background:

  • Growing demand for advanced thermal protection materials.
  • Existing materials face challenges in balancing thermal insulation, mechanical properties, and manufacturing complexity.
  • Need for integrated solutions for demanding thermal management applications.

Purpose of the Study:

  • To develop a novel ceramic material with enhanced thermal insulation and mechanical strength.
  • To address the limitations of current thermal protective materials.
  • To create a scalable manufacturing process for high-performance ceramics.

Main Methods:

  • Fabrication of a nacre-like porous ceramic using a bottom-up film-to-bulk assembly.
  • Characterization of thermal conductivity and mechanical properties.
  • Evaluation of fire resistance and post-fire performance.

Main Results:

  • Achieved a ceramic material with low thermal conductivity (≈0.058 W m⁻¹ K⁻¹) and high mechanical strength (22 MPa).
  • Nacre-like microstructure with aligned microplatelets and mineral bridges enhances insulation and strength.
  • Demonstrated structure-induced anisotropy in thermal conductivity for tailored heat management.
  • Exhibited excellent fire resistance and maintained performance after exposure to fire.

Conclusions:

  • The developed nacre-like porous ceramic offers an integrated solution for thermal protection.
  • Scalable bottom-up assembly enables efficient manufacturing of high-performance materials.
  • The material's properties make it suitable for complex thermal protection applications, including aerospace and industrial uses.