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Lightweight high-temperature-resistant silicon carbide aerogel and preparation method thereof
The invention relates to lightweight high-temperature-resistant silicon carbide aerogel and a preparation method thereof.The preparation method comprises the following steps that S1, graphene oxide powder, ascorbic acid and deionized water are mixed, dispersed and then subjected to pre-reduction, and pre-reduced graphene oxide gel is obtained; s2, freezing the pre-reduced graphene oxide gel, and after the pre-reduced graphene oxide gel is completely frozen, performing freeze drying and high-temperature thermal reduction to obtain layered reduced graphene oxide aerogel; s3, mixed powder of silicon powder and silicon dioxide powder serves as a silicon source and is mixed with the layered reduced graphene oxide aerogel, high-temperature gas-phase siliconizing is conducted, and the silicon carbide aerogel of the nanowire filling layered structure is obtained. The silicon carbide aerogel prepared by the method is of a nanowire filling layered structure, has ultra-light weight, high mechanical property, ultrahigh-temperature heat insulation (infrared stealth) performance and fire resistance and has wide application prospects in the field of high-temperature thermal protection materials, and the method is short in production period, high in controllable degree, low in cost and suitable for large-scale production.
本发明涉及一种轻质耐高温碳化硅气凝胶及其制备方法，包括如下步骤：S1、将氧化石墨烯粉末、抗坏血酸和去离子水混合分散后进行预还原，得到预还原氧化石墨烯凝胶；S2、对预还原氧化石墨烯凝胶进行冷冻，冷冻完全后再进行冷冻干燥及高温热还原，得到层状还原氧化石墨烯气凝胶；S3、将硅粉和二氧化硅粉的混合粉末作为硅源，与层状还原氧化石墨烯气凝胶混合，进行高温气相渗硅，得到纳米线填充层状结构的碳化硅气凝胶。本发明制备的碳化硅气凝胶为纳米线填充层状结构，具有超轻、高力学性能、超高温隔热(红外隐身)性能和耐火性能，在高温热防护材料领域具有广阔的应用前景，而且该方法生产周期短、可控程度高、成本低，适于大规模生产。
Lightweight high-temperature-resistant silicon carbide aerogel and preparation method thereof
The invention relates to lightweight high-temperature-resistant silicon carbide aerogel and a preparation method thereof.The preparation method comprises the following steps that S1, graphene oxide powder, ascorbic acid and deionized water are mixed, dispersed and then subjected to pre-reduction, and pre-reduced graphene oxide gel is obtained; s2, freezing the pre-reduced graphene oxide gel, and after the pre-reduced graphene oxide gel is completely frozen, performing freeze drying and high-temperature thermal reduction to obtain layered reduced graphene oxide aerogel; s3, mixed powder of silicon powder and silicon dioxide powder serves as a silicon source and is mixed with the layered reduced graphene oxide aerogel, high-temperature gas-phase siliconizing is conducted, and the silicon carbide aerogel of the nanowire filling layered structure is obtained. The silicon carbide aerogel prepared by the method is of a nanowire filling layered structure, has ultra-light weight, high mechanical property, ultrahigh-temperature heat insulation (infrared stealth) performance and fire resistance and has wide application prospects in the field of high-temperature thermal protection materials, and the method is short in production period, high in controllable degree, low in cost and suitable for large-scale production.
本发明涉及一种轻质耐高温碳化硅气凝胶及其制备方法，包括如下步骤：S1、将氧化石墨烯粉末、抗坏血酸和去离子水混合分散后进行预还原，得到预还原氧化石墨烯凝胶；S2、对预还原氧化石墨烯凝胶进行冷冻，冷冻完全后再进行冷冻干燥及高温热还原，得到层状还原氧化石墨烯气凝胶；S3、将硅粉和二氧化硅粉的混合粉末作为硅源，与层状还原氧化石墨烯气凝胶混合，进行高温气相渗硅，得到纳米线填充层状结构的碳化硅气凝胶。本发明制备的碳化硅气凝胶为纳米线填充层状结构，具有超轻、高力学性能、超高温隔热(红外隐身)性能和耐火性能，在高温热防护材料领域具有广阔的应用前景，而且该方法生产周期短、可控程度高、成本低，适于大规模生产。
Lightweight high-temperature-resistant silicon carbide aerogel and preparation method thereof
一种轻质耐高温碳化硅气凝胶及其制备方法
YANG ZICHUN (author) / XIA YUANJIA (author) / CHEN GUOBING (author) / ZHANG ZHEN (author) / ZHAO SHUANG (author) / LI KUNFENG (author) / FEI ZHIFANG (author) / SUN WENCAI (author) / ZHANG LEI (author) / CHEN JUN (author)
2024-09-03
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
/
B01J
Chemische oder physikalische Verfahren, z.B. Katalyse oder Kolloidchemie
,
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
/
B63G
OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS
,
Angriffs- oder Verteidigungsanordnungen auf Schiffen
/
B64C
AEROPLANES
,
Flugzeuge
/
B64G
Raumfahrt
,
COSMONAUTICS
/
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
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