制备了碳纤维增强水泥基复合材料,在SEM扫描电镜下观察了样品的断口形貌.利用NRL测试系统测试了低频段4-8GHz和高频段8～18GHz条件下、碳纤维质量分数分别为0.2%,0.4%,0.6%,0.8%,1.0%时,复合材料对电磁波的反射率,评价了电磁干扰性能.结果表明,低频段时所测得的反射率均小于-10 dB,材料对电磁波主要表现出吸收性;高频段且碳纤维质量分数超过0.6%时,反射率大于-10 dB,材料对电磁波主要表现出反射性.反射率随着碳纤维质量分数的增加而变化,低频段且碳纤维质量分数为0.6%时,出现最小反射率,其大小为-15.1 dB:高频段且碳纤维质量分数为0.4%时,出现最小反射率,其大小为-19.3 dB.
Carbon-fiber-reinforced cement-based composites were prepared and their fracture surfaces were observed by scanning electron microscopy. The reflectivities of the composites in the frequency ranges of 4～8 GHz and 8～18 GHz were measured by using the Naval Research Laboratory testing system to assess the electromagnetic interference through investigating the influence of carbon fiber contents of 0.2, 0.4, 0.6, 0.8, 1.0 wt% on their reflectivities. Results showed that all of the measured reflectivities data were less than -10 dB in the lower frequency range and there was mainly absorption of electromagnetic waves. However, the reflectivity was more than -10 dB when the fiber mass fraction was over 0.6% in the higher frequency range, and the electromagnetic waves were mainly reflected. As the mass fraction increased, the reflectivity changed. The minimum reflectivity in the lower frequency range was -15.1 dB when the mass fraction was 0.6%, whereas that in the higher frequency range was -19.3 dB when the mass fraction was 0.4%.
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