Research on the electromagnetic shielding properties and absorbing properties of carbon fiber reinforced cement-based composites

Abstract

To deal with the problems of electromagnetic informat ion leakage, electromagnetic environment pollution and electromagnetic interference, carbon fiber reinforced cement-based composite materials are adopted as new electromagnetic protection materials. In the experiment, graphite was used as a shielding medium, and ultrafine Fe powder was used as a wave absorbent, and the carbon fiber cement-based composite materials were respectively mixed to prepare new electromagnetic shielding materials. Using the coaxial method and the shielded chamber method to study the shielding effectiveness of the cement-based material compounded with graphite and carbon fiber; using the bow-shaped method to study the absorbing performance of the cement -based material compounded with ultrafine iron powder and carbon fiber; Energy spectroscopy and X-ray diffraction were used to study the surface morphology and microstructure of the carbon fiber cement-based composites. The results showed that the shielding effectiveness of the samples compounded with graphite and carbon fiber reached a maximum of 38.4dB, and the average shielding effectiveness of the sample reached 25.6dB; the reflectivity of the samples compounded with ultrafine Fe powder and carbon fiber reached -17.1dB, the average reflectivity reaches -9.85dB at 0.95GHz-10GHz.