Research On Absorbing Characteristics Of Boron Carbide Absorbing Materials

With the development of electronic technology,the application of electrical and electronic equipment is increasing, electromagnetic radiation has become a new environmental pollution. Electromagnetic interference caused by electromagnetic radiation seriously affect the normal operation of electrical and electronic equipments, and also endanger human health, thus absorbing materials research which will reduce the hazards of electromagnetic radiation is essential.As the dielectric-type absorbing agent, boron carbide has a good electromagnetic shielding characteristic, but still need to improve the range of the absorption band and absorption properties.we prepared a series samples of the boron carbide composites with butyl rubber matrix in different volume fractions and different thickness.This article studies the the network structure,does electromagnetic reflection loss testing, analysize the relationship between flat absorbing properties and electrimagnetic parameter of absorbing composite materials.By testing,the results show that boron carbide has a higher dielectric constant, which will help the absorption of electromagnetic waves. With the same absorbing agent content, absorbing properties of the lmm samples are relatively poor, above lmm,the absorbing performance of samples gradually increase with the increase in thickness, the peak moves to low frequency and the effective bandwidth is gradually narrower. In the case of the same thickness,the absorbing performance gradually increases with the increased levels of specimen absorbing agent, showing a similar change in the law of thickness.As boron carbide added into butyl rubber, with the boron carbide content increasing, its conductivity gradually increased,the increase of boron carbide content within the composite has gradually improved conductive network, so that the conductivity gradually increased, but at level of 70%, the conductive network has tended to be improved well,so the more content of boron carbide will not significantly enhance the conductivity.