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Adding carbon fiber to improve the electromagnetic shielding ability of gypsum matrix composites

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Document pages: 14 pages

Abstract: The effects of different carbon fiber volume fraction on electromagnetic shielding properties of gypsum composites were studied. The traditional types of gypsum commonly used in industry, namely cement, lime, gypsum and lime cement (thermo UM), are the basic materials of the created composites. The electromagnetic module in COMSOL multiphysics is used for numerical simulation, and the basic idea of improving electromagnetic shielding performance is verified. The above carbon Microfiber with a critical length of 8   mm was added to the gypsum sample as a reinforcement and shield. From the point of view of mechanical properties, fibers shorter than the critical length do not provide sufficient reinforcement.he samples were created at three different volume fractions of the dispersion and one without any reinforcement for the possibilities of their mutual comparison. The results of the carried measurement show that the electromagnetic shielding in the plaster composite grows with the increase of fiber content within the tested ratio proportionately. Also, the dependency of shielding ability on the inner material moisture has been studied. Any measureable influence of the moisture content on to the total shielding effect has not been found. Only in the lime plaster reinforced with fibers, the increased moisture could significantly decrease the shielding effect.

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