期刊论文

Li, Xianjun(lxjmu@csuft.edu.cn)

中文

复合材料学报

1000-3851

2022

39

10

4590-4601

10.13801/j.cnki.fhclxb.20211105.001

2018YJ033:中南林科大人才启动基金 18B173:湖南省教育厅科学研究项目

本校为第一机构

为了改善Fe_3O_4吸波材料密度大和吸波频带窄等问题,以马尾松木材为原料,采用去木质素及高温原位生长法制备了多孔木炭(WPC)/Fe_3O_4复合材料,通过变化碳化温度来调控复合材料的电磁特性与微波吸收性能。微观形貌、结构和电磁参数等结果表明:WPC/Fe_3O_4复合材料保有木材天然的三维孔结构,Fe_3O_4粒子均匀负载于多孔木炭的炭壁与孔道中;升高碳化温度(630~690℃)可增强材料的电导率与电磁衰减能力,但温度过高会引起材料阻抗失配。670℃制备的复合材料微波衰减能力强且阻抗匹配特性好,最小反射损耗为-49.5 dB,有效吸收频宽为6.24 GHz(9.04~15.28 GHz),主要衰减机制归结于复合材料的电导损耗、极化...

In order to improve the shortages of big density and narrow absorption bandwidth of Fe3O4 absorbing material, in this study, wood-based porous charcoal (WPC)/Fe3O4 composites were prepared from fast-growing masson pine wood by delignification and high temperature in-situ growth methods. The microwave absorption properties of the composites were regulated by tailoring the carbonization temperature. The results of micromorphology, structure and electromagnetic parameters show that, the WPC/Fe3O4 composites retain the natural three-dimensional por...