间苯二酚-甲醛增强二氧化硅气凝胶的制备及其吸波性能
Preparation of resorcinol-formaldehyde enhanced silica aerogels and their absorption properties
叶信立 1张海洋 2马小民 3毛帮笑 4张俊雄5
作者信息
- 1. 西北工业大学 民航学院,西安 710072;西北工业大学深圳研究院,深圳 518063
- 2. 西北工业大学 民航学院,西安 710072
- 3. 国装新材料技术(江苏)有限公司,苏州 215400
- 4. 北京新风航天装备有限公司,北京 100854
- 5. 南通大学 纺织服装学院,南通 226019
- 折叠
摘要
为了探究SiO2 气凝胶在电磁吸波领域应用的可能性,通过溶胶-凝胶技术引入间苯二酚-甲醛(RF)构建多孔骨架,再结合常压干燥法,成功合成RF/SiO2 复合材料,并对RF/SiO2 气凝胶进行了热处理,通过SEM、XRD等对热处理后的RF/SiO2 气凝胶微观结构和理化性能进行表征,探究了热处理温度对RF/SiO2 气凝胶吸波性能的影响规律.结果表明:随热处理温度的增加,吸波性能大幅提升,当热处理温度为 1 500℃时,RF/SiO2 气凝胶在 4.05 mm厚度下表现出-48.42 dB的最小反射损耗,当厚度为 3.45 mm时有效吸收带宽达到了 2.06 GHz,表现出了优异的电磁波吸收性能.该研究为制备高性能吸波材料提供了指导.
Abstract
A composite material of resorcinol-formaldehyde(RF)enhanced silica dioxide aerogel(RF/SiO2)had been successfully synthesized by introducing RF to build a porous framework through the sol-gel technique,followed by ambient pressure drying to explore the possibility of the application of silica dioxide aerogel in electro-magnetic microwave absorption.The RF/SiO2 aerogel was then subjected to heat treatment,and its microstructure and physicochemical properties after heat treatment were characterized using SEM,XRD,and other methods.The influence of heat treatment temperature on the microwave absorption performance of RF/SiO2 aerogel was investi-gated.The results show that the microwave absorption performance of RF/SiO2 aerogel is significantly improved with increasing heat treatment temperature.At a heat treatment temperature of 1 500℃,the RF/SiO2 aerogel exhibits a minimum reflection loss of-48.42 dB at a thickness of 4.05 mm.At a thickness of 3.45 mm,the effective absorption bandwidth reaches 2.06 GHz,demonstrating excellent electromagnetic wave absorption performance.This study provides guidance for the preparation of high-performance microwave-absorbing materials.
关键词
RF/SiO2/气凝胶/溶胶-凝胶法/微观结构/热处理/吸波性能Key words
RF/SiO2 aerogel/sol-gel method/microstructure/heat treatment/absorbing performance引用本文复制引用
基金项目
中央高校基本科研业务费专项(D5000210522)
陕西省自然科学基础研究青年项目(2022JQ-482)
广东省基础与应用基础研究基金(2021A1515111155)
中国博士后科学基金第 70 批面上资助(2021M702665)
出版年
2024
NETL
NSTL
万方数据