摘要
为解决电磁辐射污染问题,开发经济环保的高效电磁波吸收材料制备工艺刻不容缓。碳基电磁波吸收材料因其独特优势而备受关注,但合适的前驱体碳源以及合理孔结构构筑策略仍是其制备面临的难题。本文以资源丰富的煤液化油渣为碳源,通过盐模板辅助策略,利用NaHCO_(3)模板热分解过程中产生的Na_(2)CO_(3)和大量气体实现了多孔炭骨架的定向形成。相互贯穿的多孔结构不仅调节了炭材料的阻抗匹配,还延长了电磁波的传输路径,增强了介电损耗,在多种电磁损耗机制的协同作用下,煤液化残渣基多孔炭材料展现出优异的电磁波吸收能力。在质量分数仅为10%的填充比以及2.03 mm的厚度下,获得的多孔炭材料展现出-60.28 dB的反射损耗值,并实现了5.36 GHz的有效吸收频宽。因此,本文为高性能碳基电磁波吸收材料的开发提供了新的途径,也为煤液化油渣产品的高附加值利用提供了新的思路。
To solve the problem of electromagnetic radiation pollution,it is necessary to develop an economic and environmentally friendly way of producing efficient electromagnetic wave absorbing materials.Carbon-based materials have attracted much attention but finding suitable precursors and ways of producing defined pore structures are still challenges.We reporte a simple method to produce porous carbon using coal liquefaction oil residue as the carbon source.The produced porous skeletons are due to the Na_(2)CO_(3) templates and CO_(2) gas generated during the thermal decomposition of NaHCO_(3) templates.It is found that changing the pore structure not only adjusts the impedance matching of the material but also increases the length of the electromagnetic wave transmission path and increases dielectric loss.With the combined effect of multiple electromagnetic loss mechanisms,the material has excellent electromagnetic wave absorption.Specifically,with a filler loading of only 10% and a thickness of 2.03 mm,the obtained carbon material has a reflection loss value of -60.28 dB and an effective absorption bandwidth of 5.36 GHz.This work provides a new approach to developing high-performance carbon-based electromagnetic wave absorbing materials and also offers a new idea for the high value-added use of coal liquefaction oil residue products.
作者
王建立
尹甜
张晨
杨旺
蒋波
李永峰
徐春明
WANG Jian-li;YIN Tian;ZHANG Chen;YANG Wang;JIANG Bo;LI Yong-feng;XU Chun-ming(State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China;China Shenhua Coal to Liquid and Chemical Co.,Ltd,Beijing 100011,China)
出处
《新型炭材料（中英文）》
SCIE
EI
CAS
CSCD
北大核心
2023年第5期875-886,共12页
New Carbon Materials
基金
国家自然科学基金(21908245,22178384)。
关键词
炭材料
煤液化油渣
孔结构
盐模板
电磁波吸收
Carbon materials
Coal liquefaction residue
Porous structure
Salt template
Electromagnetic wave absorption
作者简介
通讯作者:杨旺,博士,副教授.E-mail:wyang@cup.edu.cn;通讯作者:李永峰,博士,教授.E-mail:yfli@cup.edu.cn;王建立,博士生.E-mail:jianli.wang@chnenergy.com。
