Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Reinforced graphene composite aerogel and preparation method thereof
The invention belongs to the technical field of composite aerogel, and discloses a preparation method of graphene oxide/polysilazane composite aerogel, which comprises the following steps: by taking graphene oxide and a polysilazane ceramic precursor as raw materials, aluminum sec-butoxide as an aluminum source and divinyl benzene as a cross-linking agent, adding an organic solvent, and carrying out hydrothermal reaction to obtain wet gel; the high-temperature heat-insulating SiCN-Al2O3/rGO composite aerogel with a nano interpenetrating structure is prepared by a hydrothermal reaction and a supercritical CO2 drying process in combination with a ceramic precursor conversion method. The SiCN-Al2O3/rGO composite aerogel comprises a two-dimensional nano graphene sheet layer, nano-scale SiCN-Al2O3 ceramic particles are loaded on the two-dimensional nano graphene sheet layer, the SiCN-Al2O3 ceramic particles are connected with one another, the SiCN-Al2O3 ceramic particles and the two-dimensional nano graphene sheet layer form a porous skeleton network, and the porous skeleton network has nano-scale uniform pores. The composite aerogel provided by the invention has excellent mechanical properties and good high-temperature heat insulation performance, and can meet the thermal protection requirements of novel aircrafts in a high-temperature environment.
本发明属于复合气凝胶技术领域，公开了一种以氧化石墨烯、聚硅氮烷陶瓷先驱体为原料，以仲丁醇铝为铝源，二乙烯基苯为交联剂，加入有机溶剂后通过水热反应得到湿凝胶；通过水热反应以及超临界CO2干燥工艺，结合陶瓷先驱体转换法，制备得到具有纳米互穿结构的高温隔热SiCN‑Al2O3/rGO复合气凝胶。该SiCN‑Al2O3/rGO复合气凝胶包括二维纳米石墨烯片层，二维纳米石墨烯片层上负载有纳米级的SiCN‑Al2O3陶瓷颗粒，SiCN‑Al2O3陶瓷颗粒之间相互连接，并且与二维纳米石墨烯片层构成多孔骨架网络，多孔骨架网络具有纳米级的均匀孔隙。本发明的复合气凝胶具有优异的力学性能、良好的高温隔热性能，可满足高温环境新型飞行器的热防护需求。
Reinforced graphene composite aerogel and preparation method thereof
The invention belongs to the technical field of composite aerogel, and discloses a preparation method of graphene oxide/polysilazane composite aerogel, which comprises the following steps: by taking graphene oxide and a polysilazane ceramic precursor as raw materials, aluminum sec-butoxide as an aluminum source and divinyl benzene as a cross-linking agent, adding an organic solvent, and carrying out hydrothermal reaction to obtain wet gel; the high-temperature heat-insulating SiCN-Al2O3/rGO composite aerogel with a nano interpenetrating structure is prepared by a hydrothermal reaction and a supercritical CO2 drying process in combination with a ceramic precursor conversion method. The SiCN-Al2O3/rGO composite aerogel comprises a two-dimensional nano graphene sheet layer, nano-scale SiCN-Al2O3 ceramic particles are loaded on the two-dimensional nano graphene sheet layer, the SiCN-Al2O3 ceramic particles are connected with one another, the SiCN-Al2O3 ceramic particles and the two-dimensional nano graphene sheet layer form a porous skeleton network, and the porous skeleton network has nano-scale uniform pores. The composite aerogel provided by the invention has excellent mechanical properties and good high-temperature heat insulation performance, and can meet the thermal protection requirements of novel aircrafts in a high-temperature environment.
本发明属于复合气凝胶技术领域，公开了一种以氧化石墨烯、聚硅氮烷陶瓷先驱体为原料，以仲丁醇铝为铝源，二乙烯基苯为交联剂，加入有机溶剂后通过水热反应得到湿凝胶；通过水热反应以及超临界CO2干燥工艺，结合陶瓷先驱体转换法，制备得到具有纳米互穿结构的高温隔热SiCN‑Al2O3/rGO复合气凝胶。该SiCN‑Al2O3/rGO复合气凝胶包括二维纳米石墨烯片层，二维纳米石墨烯片层上负载有纳米级的SiCN‑Al2O3陶瓷颗粒，SiCN‑Al2O3陶瓷颗粒之间相互连接，并且与二维纳米石墨烯片层构成多孔骨架网络，多孔骨架网络具有纳米级的均匀孔隙。本发明的复合气凝胶具有优异的力学性能、良好的高温隔热性能，可满足高温环境新型飞行器的热防护需求。
Reinforced graphene composite aerogel and preparation method thereof
一种增强石墨烯复合气凝胶及其制备方法
LIU HONGLI (Autor:in) / YUAN WENJIN (Autor:in) / LIU WEI (Autor:in) / SUI YING (Autor:in) / LIU WENCHENG (Autor:in) / CHU XIAOYU (Autor:in) / CHEN JIANYU (Autor:in)
30.08.2022
Patent
Elektronische Ressource
Chinesisch
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