气凝胶
材料科学
碳化硅
同轴
复合材料
保温
弹性(材料科学)
烧结
热导率
机械工程
图层(电子)
工程类
作者
Pan He,Yuelei Pan,Mingyuan Yan,Lunlun Gong,Long Shi,Xudong Cheng,Heping Zhang,Junchao Zhao
标识
DOI:10.1016/j.compositesa.2024.108153
摘要
Silicon Carbide (SiC) aerogel is a material with 3D network structure, low density, and high-temperature resistance, showing a broad application potential in various areas. It is currently challenging for SiC aerogels to balance the mechanical and high-temperature insulation properties. Here, a novel strategy was implemented for the first time, by constructing coaxial precursors. This structure can achieve in-situ Si-C binding and maximization the reaction sites to achieve fibers growth uniformly. The sintering time is reduced by over 90%. The fatigue resistance and elastic properties of the SiC aerogel were significantly improved. In addition, the uniform nanowire fiber and pore structure enable an ultra-low thermal conductivity of 0.018 W/(m K) at room temperature, 0.082 W/(m K) even at 900 °C, and superior structural stability at 1400 °C. Our strategy provides a feasible approach for the structural design of thermally insulated SiC aerogels with high elastic resilience and good adsorbability.
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