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Nanofiber aerogel composite material with ultralow thermal conductivity and preparation method thereof
The invention discloses a nanofiber aerogel composite material with ultralow thermal conductivity and a preparation method thereof. The composite material is composed of nano-fiber aerogel and oxide aerogel, the mass fraction of the nano-fiber aerogel is 60-90%, the nano-fiber aerogel is one or more of nano silicon oxide fibers, nano aluminum oxide fibers, silicon carbide nanowires, carbon nanotubes and attapulgite nano-rod crystal aerogel, and the nano-fiber aerogel is one or more of nano silicon oxide fibers, nano aluminum oxide fibers, silicon carbide nanowires, carbon nanotubes and attapulgite nano-rod crystal aerogel. The oxide aerogel is one or more of aluminum oxide aerogel, silicon oxide aerogel and zirconium oxide aerogel. According to the material, three-dimensional nanofiber aerogel prepared through a directional solidification and freeze-drying technology serves as a reinforcement body, oxide aerogel is compounded, a layered fiber supporting frame and nanopore aerogel compounded double-network structure is obtained, and ultralow heat conductivity is obtained by embedding nanopores in micro-nano graded pores; the fiber cross-linked network structure obviously improves the mechanical properties (compression strength and compression modulus) of the aerogel composite material, and has important use value in the field of high-temperature heat insulation.
本发明公开了一种超低热导率纳米纤维气凝胶复合材料及其制备方法。由纳米纤维气凝胶和氧化物气凝胶组成，纳米纤维气凝胶质量分数为60～90％，纳米纤维气凝胶为纳米氧化硅纤维、纳米氧化铝纤维、碳化硅纳米线、碳纳米管、凹凸棒土纳米棒晶气凝胶中的一种或多种，氧化物气凝胶为氧化铝、氧化硅、氧化锆气凝胶中的一种或多种。该材料以定向凝固与冷冻干燥技术制备的三维纳米纤维气凝胶为增强体，并复合氧化物气凝胶，获得层状纤维支撑框架和纳米孔气凝胶复合的双网络结构，通过微纳分级孔隙内嵌纳米孔隙获得超低热导率，纤维交联网络结构显著提高气凝胶复合材料力学性能(压缩强度、压缩模量)，在高温隔热领域有重要使用价值。
Nanofiber aerogel composite material with ultralow thermal conductivity and preparation method thereof
The invention discloses a nanofiber aerogel composite material with ultralow thermal conductivity and a preparation method thereof. The composite material is composed of nano-fiber aerogel and oxide aerogel, the mass fraction of the nano-fiber aerogel is 60-90%, the nano-fiber aerogel is one or more of nano silicon oxide fibers, nano aluminum oxide fibers, silicon carbide nanowires, carbon nanotubes and attapulgite nano-rod crystal aerogel, and the nano-fiber aerogel is one or more of nano silicon oxide fibers, nano aluminum oxide fibers, silicon carbide nanowires, carbon nanotubes and attapulgite nano-rod crystal aerogel. The oxide aerogel is one or more of aluminum oxide aerogel, silicon oxide aerogel and zirconium oxide aerogel. According to the material, three-dimensional nanofiber aerogel prepared through a directional solidification and freeze-drying technology serves as a reinforcement body, oxide aerogel is compounded, a layered fiber supporting frame and nanopore aerogel compounded double-network structure is obtained, and ultralow heat conductivity is obtained by embedding nanopores in micro-nano graded pores; the fiber cross-linked network structure obviously improves the mechanical properties (compression strength and compression modulus) of the aerogel composite material, and has important use value in the field of high-temperature heat insulation.
本发明公开了一种超低热导率纳米纤维气凝胶复合材料及其制备方法。由纳米纤维气凝胶和氧化物气凝胶组成，纳米纤维气凝胶质量分数为60～90％，纳米纤维气凝胶为纳米氧化硅纤维、纳米氧化铝纤维、碳化硅纳米线、碳纳米管、凹凸棒土纳米棒晶气凝胶中的一种或多种，氧化物气凝胶为氧化铝、氧化硅、氧化锆气凝胶中的一种或多种。该材料以定向凝固与冷冻干燥技术制备的三维纳米纤维气凝胶为增强体，并复合氧化物气凝胶，获得层状纤维支撑框架和纳米孔气凝胶复合的双网络结构，通过微纳分级孔隙内嵌纳米孔隙获得超低热导率，纤维交联网络结构显著提高气凝胶复合材料力学性能(压缩强度、压缩模量)，在高温隔热领域有重要使用价值。
Nanofiber aerogel composite material with ultralow thermal conductivity and preparation method thereof
一种超低热导率纳米纤维气凝胶复合材料及其制备方法
YANG LIXIA (Autor:in) / DING YANG (Autor:in) / WU QIONG (Autor:in) / CHEN ZHAOFENG (Autor:in)
24.05.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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