Effect of additive paint properti̇es on radar absorption

Radar Absorbing Material (RAM) is a type of material designed to reduce reflection by absorbing a part of the electromagnetic wave transmitted by the radar. RAM has a strategic importance. Due to the critical importance of radar absorbing materials for our country, a thesis study was initiated to research and develop this material. In this thesis study, magnetic weighted powders [(Fe, Ni, Co, Mn, (Ba + Fe), (Mn + Ba + Ni + Fe)] and loboratory produced magnetic nanometal oxides were doped into paints for radar absorption materials (RAM). Two different methods were used to produce magnetic nanometal oxides. These are hydrothermal and co-precipitation methods. XRD, SEM measurements were performed for the structure and morphology of the obtained magnetic nanometal and the powders in our hand. VSM measurements were performed for the characterization of magnetic nanoparticles. Dipping and spraying methods were applied to prepare the samples to be doped. Our samples were doped into composites (glassfibre) and aluminum (A6000) alloys commonly used in the defense industry and their radar absorption was investigated. The doped materials were firstly tested doped by the molecular weight of the dye and the most suitable doping rations were determined as 5%, 10%, 15% in our experiment, so that dopings with the most suitable absorption properties for RAM were provited. The composite (Glassfibre) materials used as substrate in this study were prepared under vacuum and cut to the desired dimensions for absorption values. The first layer of the samples was applied as primer paint and left to dry for 24 hours,then the paint,doped powders and nanoparticles were added and left to dry again for 24 hours at room temperature. The absorption values of the obtained samples in the range of 3.3.-12.4 GHz were analysed by the waveguide method. It is seen in the measurements that the highest radar absorption values of doped powders and nanoparticles give better results in materials with an average of 10% doping.