森林工程2026，Vol.42Issue(5)：998-1010,13.DOI:10.7525/j.issn.1006-8023.2026.05.011
不同密度木基碳材料的制备及电磁屏蔽性能
Preparation and Study of Electromagnetic Shielding Properties of Wood-Based Carbon Materials with Different Densities
摘要
Abstract
To address the increasingly severe problem of electromagnetic pollution,three common broadleaf woods with significantly different densities-paulownia,basswood,and eucalyptus-were selected.Wood-based carbon materials were prepared using a high-temperature carbonization process,and the relationship between the physicochemical properties and electromagnetic shielding performance of these three materials was systematically compared.The results indicated that after carbonization,the wood retained its natural skeletal structure and porous characteristics;the carbonization process conferred electrical conductivity to the originally insulating wood,with the resulting wood-based carbon materials exhibit-ing a conductivity of 3.08-3.53 S·cm-1.The total shielding efficiency of all three wood-based carbon materials exceeded 20 dB,meeting the basic requirements for commercial applications.Due to differences in microstructure and density,the three wood types exhibited distinct advantages in electromagnetic shielding performance.Among them,the paulownia-based carbon,with the lowest density,was dominated by absorption loss and was suitable for green shielding applications;the basswood-based carbon,with medium density,struck a balance between absorption and reflection,demonstrating rela-tively balanced shielding performance;while the eucalyptus-based carbon,with the highest density,exhibited the highest shielding efficiency but had relatively strong reflection loss.This study reveals the mechanism by which density differ-ences influence the continuity and pore structure of the conductive network after carbonization,thereby achieving the synergistic interaction between conductive loss and multiple reflection loss.It provides experimental evidence and theo-retical references for the development of high-performance wood-based carbon electromagnetic shielding composites.关键词
木基碳材料/碳化/电磁屏蔽/密度/多孔结构Key words
Wood-based carbon materials/carbonization/electromagnetic shielding/density/porous structure分类
农业科技引用本文复制引用
魏敏,于凡钧,邱哲,肖泽芳,张天鹏,谢延军..不同密度木基碳材料的制备及电磁屏蔽性能[J].森林工程,2026,42(5):998-1010,13.基金项目
国家重点研发计划项目(2023YFD2201402) （2023YFD2201402）
黑龙江省博士后科研启动金项目(LBH-Z24004). （LBH-Z24004）
