Composites Materials with Applications in Electromagnetic Protection

摘要

The increasing use of technology in our everyday environment has led to the ubiquitous presence of electromagnetic fields. Example of electromagnetic sources range fro domestic electricity cables and high frequency sources such as radio and television transmitters or cellular phone network stations to visible and ultraviolet light. From this unprecedented situation arise at least two main problems which are waiting to be solved: the safety of information transmissions and electronic devices proper working one a side and on the other hand the biological protection against the increasing level of electromagnetic fields radiated from such a large variety of sources. The paper presents the different composite materials, produced in rigid or flexible form, with potential applications as electromagnetic shields, in range of 0.8 - 3 GHz, with a medium attenuation of ca. 20 dB. The materials are prepared through Powder Metallurgy ways as carbon/ceramic, recycled pyrite ashes/polymeric composites.