摘要
基于溶胶-凝胶技术,通过物理共混和常压干燥方法,制备了还原氧化石墨烯/酚醛树脂(RGO/PR)杂化气凝胶,考察了RGO/PR杂化气凝胶微观结构、热稳定性和介电性能随RGO含量的变化规律,并探索其作为防隔热/吸波复合材料基体的应用性能。结果表明:RGO片层结构均匀分散在酚醛气凝胶骨架中,RGO的加入可以有效提升气凝胶的热稳定性,当添加RGO的质量分数为4%时,杂化气凝胶的Tmax提升17.28℃;RGO对RGO/PR的介电性能有显著影响,2 GHz介电常数实部由2.6增加到4.7,可以实现对PR气凝胶电性能的灵活调控;气凝胶厚度为20 mm时,最低反射损耗小于-10dB;石英纤维增强RGO/PR杂化气凝胶经500 s表面温度为1200℃的烧蚀后,最大背温仅为186.31℃,表现出良好的防隔热性能。
Reduced graphene oxide/phenolic resin(RGO/PR)hybrid aerogel was prepared by physical blending and ambient drying method based on sol-gel technology.The changes in the microstructure,thermal stability and dielectric properties of RGO/PR hybrid aerogel were investigated with the RGO content,and the application performance of RGO/PR hybrid aerogel as a thermal insulation/microwave absorption composite matrix was explored.The results show that the RGO lamellar structure is uniformly dispersed in the phenolic aerogel skeleton,and the addition of RGO can effectively improve the thermal stability of the aerogel.When RGO with a mass fraction of 4%is added,the Tmax of the hybrid aerogel is increased by 17.28℃.RGO has a significant effect on the dielectric properties of RGO/PR,and the real part of the 2 GHz dielectric constant increases from 2.6 to 4.7,which can realize flexible regulation of the electric properties of PR aerogel.When the aerogel thickness is 20 mm,the minimum reflection loss is less than-10 dB.After the quartz fiber reinforced RGO/PR hybrid aerogel is ablated for 500 s at a surface temperature of 1200℃,the maximum back temperature is only 186.31℃,showing good thermal insulation performance.
作者
王晓岚
师建军
姚祺
孔磊
杨云华
WANG Xiaolan;SHI Jianjun;YAO Qi;KONG Lei;YANG Yunhua(Aerospace Research Institute of Materials&Processing Technology,Beijing 100076)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2024年第4期63-69,共7页
Aerospace Materials & Technology
关键词
酚醛树脂
有机气凝胶
还原氧化石墨烯
防热
吸波
Phenolic resin
Organic aerogel
Reduced graphene oxide
Thermal protection
Microwave absorption
