在极端条件下用于隔热的低晶陶气凝
Jingran Guo1, Shubin Fu1, Yuanpeng Deng1
1Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology and Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, China.
Nature
|June 29, 2022
概括
研究人员开发了用于极端条件的先进陶气凝. 这些新型纳米纤维气凝在1000°C以上的温度下提供优异的隔热和稳定性.
科学领域:
- 材料科学
- 纳米技术
- 陶工程
背景情况:
- 高温隔热对于极端环境至关重要.
- 传统的陶气凝面临着在高温下增加的导热性和热力学不稳定的挑战.
- 开发适用于1000°C以上应用的坚固材料仍然是一个重大挑战.
研究的目的:
- 为极端条件设计和合成具有增强热力学稳定性和超低导热性的先进陶气凝.
- 研究多尺度架构,材料特性和高温性能之间的关系.
- 克服现有的陶气凝在高温绝缘应用中的局限性.
主要方法:
- 具有齐格扎格结构的虚晶纳米纤维气凝的多尺度设计.
- 将残留的碳物种纳入石纤维,以尽量减少热辐射.
- 在高温下对热力学特性 (波松比,热膨胀) 和热导率的描述.
主要成果:
- 开发的气凝具有特殊的热力学稳定性和超低的导热率 (0.104W/m·K在1000°C).
- 接近零的波桑比率 (3.3×10−4) 和热膨胀系数 (1.2×10−7/°C) 确保了结构的灵活性.
- 在热冲击和高达1300°C的工作温度后,强度降低<1%.
结论:
- 新型的低晶气凝在极端条件下提供了有前途的材料解决方案.
- 多尺度设计策略有效地解决了传统陶气凝在高温下的局限性.
- 这些材料为提高高温工业和航空应用的安全性和效率提供了途径.
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