Development and application of thin wide-band screening composite materials

Abstract

The paper is dedicated to the development of effective composite coatings with the use of carbon fillers of different morphology, their research and application in the broadband frequency range. Electromagnetic loss studies were performed according to international standards ASTM D4935, IEEE-STD-299 and the US Department of Defence standard MIL-STD 461F. The impact of hybrid carbon nanomaterial "graphene / nanotubes" on the electrophysical properties of the composite material has been analysed. As a result, the research laboratory technologies of production of composite coating on water and non-water (alcohol) basis are developed based on the carbon fillers of various morphology and also magnetite. The shielding properties of most of the created composites are estimated in the frequency range from 50 MHz to 30 GHz. The state enterprise "All-Ukrainian centre for standardization, metrology, certification and consumers' rights protection" (here and after "Ukrmetrteststandart") conducted comparative tests of the developed coating (in the form of paint) with a protective coating # 842 MG Chemicals (Burlington, Ontario, Canada) based on silver microparticles. It is concluded that the developed protective coating is not inferior to the Canadian reference sample in the entire studied frequency range, while having a much lower cost and simplified application technology. The research has been carried out to study the application of composite paint to cover the components of some radiation monitoring devices of the ECOTEST brand, in particular a multi-purpose dosimeter-radiometer MKC-UM type. Developed composites on a non-aqueous basis have already found wide practical application to solve the problem of electronic compatibility by applying a layer of 150-200 microns on the inner surface of thermal imagers and optical sights ARCHER brand. Developed water-based composites can be used for interior decoration, in the formation of electromagnetic screens, thin gradient coatings to protect people from electromagnetic radiation in the microwave range.