纸基吸波材料的制备及其电磁性能探究

Study on Preparation of Paper-based Absorbing Material and Its Electromagnetic Properties

关键词:  纸基吸波材料  吸波蜂窝  电磁参数  反射率

Key Words:paper-based absorbing materials  absorbing honeycomb  electromagnetic parameters  reflectivity

摘要:通过造纸法制备了一种可用于制备吸波蜂窝的纸基吸波材料,分别选用短切碳纤维(CF)、短切碳化硅纤维(SCF)和碳纳米管(CNT)作为吸波剂,对位芳纶浆粕(PPTA)作为基体,对比了不同吸波剂及其用量对纸基吸波材料电磁参数及吸波性能的影响。结果显示,吸波剂用量(对绝干基的质量分数)在0.1%～50%的范围内,SCF-PPTA纸基吸波材料的复介电常数实部小于CF-PPTA和CNT-PPTA纸基吸波材料的。当吸波剂用量大于3%时,CNT-PPTA纸基吸波材料的介电损耗大于另外2种材料的。当吸波剂用量分别为1%、20%和3%时,对应CF-PPTA、SCF-PPTA和CNT-PPTA纸基吸波材料的反射率最低分别可达-15.08、-28.49和-13.69dB,此时纸基吸波材料对应的厚度分别为2.45、4.35和2.98 mm。

Abstract:In this paper, the paper-based cellular absorbing material was prepared by using papermaking process. The chopped carbon fiber (CF), chopped silicon carbide fiber (SCF) and carbon nanotubes (CNT) were used as the absorbing agents, and PPTA fibrid (PPTA) was chosen as the base materials to prepare paper-based absorbing materials. The electromagnetic parameters and absorbing property of the paper-based absorbing materials with different types of absorbing agent and different absorbing agent contents were compared. The results showed that when absorbing agent content was in the range of 0.1%～50%, the real part of permittivity of the SCF-PPTA paper-based material was far lower than that of CF-PPTA or CNT-PPTA paper-based material. When the absorbing agent content was above 3%, the dielectric loss of CNT-PPTA paper-based material was larger than that of other two. When the thickness was in the range of 0 to 10 mm, abrovbing agent dosages varied from 1% to 20% the minimum reflectivity of CF, SCF and CNT paper-based materials were -15.08 dB（thickness was 2.45 mm and content of absorbing agent was 1%）, -28.49 dB（thickness 4.42 mm, absorbing agent 20%）and -13.69 dB （thickness 2.98 mm, absorbing agent 3%）respectively.