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Mechanical Robust Nacre-Mimetic Composites with Designable Cryptic Coloration and Electromagnetic Wave-Transparent
Jun Pang1, Zhen-Bang Zhang2, Ze-Yu Wang1
1New Cornerstone Science Laboratory, Department of Chemistry, Institute of Biomimetic Materials & Chemistry, Anhui Engineering Laboratory of Biomimetic Materials, Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China.
Nacre-mimetic alumina composites offer tunable colors and enhanced toughness for protective armor. These advanced ceramic materials also show potential for radar and communication equipment due to their electromagnetic wave transmission properties.
Area of Science:
- Materials Science
- Ceramic Engineering
- Nanotechnology
Background:
- Ceramic materials like alumina (Al2O3) are vital for protective equipment due to strength and stability.
- Limitations include lack of color variety and brittleness, hindering broader applications.
- Natural shells inspire solutions for enhanced material properties.
Purpose of the Study:
- To develop nacre-mimetic alumina (NMA) composites with improved toughness and color regulation.
- To investigate the potential of NMA composites in camouflage protective armor.
- To evaluate the electromagnetic wave transmission properties of NMA composites for advanced applications.
Main Methods:
- Fabrication of NMA composites using a dual-oxide interface design strategy.
- Mimicking the hierarchical structure of natural nacre for enhanced material properties.
- Characterization of mechanical properties (fracture toughness, impact resistance) and electromagnetic wave transmission.
Main Results:
- NMA composites exhibit tunable colors, enabling camouflage applications.
- Optimal NMA composite shows over three times the fracture toughness of commercial Al2O3.
- NMA composites demonstrate superior impact resistance compared to Al2O3 and polymethyl methacrylate (PMMA).
- Hierarchical structure facilitates electromagnetic wave transmission in the 18-26.5 GHz band.
Conclusions:
- Nacre-mimetic alumina composites offer a promising combination of mechanical strength, toughness, and aesthetic versatility.
- These materials are suitable for advanced protective armor and camouflage applications.
- The unique structure of NMA composites makes them viable for radar and communication equipment protection.
