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High-temperature-resistant super-elastic silicon carbide composite aerogel and preparation method thereof
The invention discloses a high-temperature-resistant super-elastic silicon carbide composite aerogel which comprises a synergistically enhanced cell wall-like structure formed by compounding micro-nano hybrid fibers, the micro-nano hybrid fibers are composed of micron fibers and nano fibers, and a three-dimensional multi-stage micro-nano fiber network structure is formed by high-temperature bonding of modified sol. According to the high-temperature-resistant super-elastic silicon carbide composite aerogel provided by the invention, a micro-nano fiber synergistically enhanced cell-like wall structure is formed through a directional freezing casting technology. And under the action of compression stress, the micron fibers serve as a framework to bear main stress load, so that stress concentration in a matrix is reduced, local stress can be transmitted to a silicon carbide nanofiber network through cross-linking nodes, and the overall mechanical strength is improved.
本发明公开了一种耐高温超弹碳化硅复合气凝胶，包括微纳米混杂纤维复合形成的协同增强类胞腔壁结构，微纳米混杂纤维是由微米纤维和纳米纤维组成，并通过一种改性溶胶进行高温粘结形成三维多级微纳米纤维网络结构。本发明所提供的一种耐高温超弹碳化硅复合气凝胶，通过定向冷冻铸造技术形成微纳米纤维协同增强的类胞腔壁结构。在受到压缩应力作用时，微米纤维充当骨架作用承受主要的应力载荷，从而减少基体中的应力集中，局部应力可以通过交联节点传递到碳化硅纳米纤维网络中，提高了整体的机械强度。
High-temperature-resistant super-elastic silicon carbide composite aerogel and preparation method thereof
The invention discloses a high-temperature-resistant super-elastic silicon carbide composite aerogel which comprises a synergistically enhanced cell wall-like structure formed by compounding micro-nano hybrid fibers, the micro-nano hybrid fibers are composed of micron fibers and nano fibers, and a three-dimensional multi-stage micro-nano fiber network structure is formed by high-temperature bonding of modified sol. According to the high-temperature-resistant super-elastic silicon carbide composite aerogel provided by the invention, a micro-nano fiber synergistically enhanced cell-like wall structure is formed through a directional freezing casting technology. And under the action of compression stress, the micron fibers serve as a framework to bear main stress load, so that stress concentration in a matrix is reduced, local stress can be transmitted to a silicon carbide nanofiber network through cross-linking nodes, and the overall mechanical strength is improved.
本发明公开了一种耐高温超弹碳化硅复合气凝胶，包括微纳米混杂纤维复合形成的协同增强类胞腔壁结构，微纳米混杂纤维是由微米纤维和纳米纤维组成，并通过一种改性溶胶进行高温粘结形成三维多级微纳米纤维网络结构。本发明所提供的一种耐高温超弹碳化硅复合气凝胶，通过定向冷冻铸造技术形成微纳米纤维协同增强的类胞腔壁结构。在受到压缩应力作用时，微米纤维充当骨架作用承受主要的应力载荷，从而减少基体中的应力集中，局部应力可以通过交联节点传递到碳化硅纳米纤维网络中，提高了整体的机械强度。
High-temperature-resistant super-elastic silicon carbide composite aerogel and preparation method thereof
一种耐高温超弹碳化硅复合气凝胶及其制备方法
LIN YING (Autor:in) / LIAO JIAXUAN (Autor:in) / LYU YANGQIAN (Autor:in)
26.03.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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