Investigation of advanced radar absorbing PANI/YIG/CB supported camouflage paint with high stealth technology to be used in military land vehicles

Recently, stealth technology, which is a type of defense technology, has been studied intensively. The stealth technology aims to prevent radar visibility by reducing the radar cross section (RCS) of target object. To reduce radar visibility, the geometry of the object must either scatter the incoming electromagnetic (EM) wave or the material used in the object must have the ability to absorb EM waves. Radar absorbing materials try to decrease radar visibility of the target object by reducing the energy of EM waves entering the material through a dielectric and/or magnetic loss mechanism. Within the scope of this thesis, a comprehensive study on radar absorbing materials was carried out. Y3Fe5O12 (short name YIG) magnetic powders, a microwave absorbing material, were synthesized using the sol-gel method. Here, interfaces were created within the structure by applying different heat treatment processes and EM wave absorption characteristics were examined. Then, YIG1-x/CBx (0.00≤x≤1.00, 0.25 increment) composites with YIG and carbon black (CB) materials were produced via solid state reaction method. The structural and magnetic properties and EM wave absorption characteristics of the produced composites were examined. Finally, PANI@YIG1-x/CBx (0.00≤x≤1.00, 0.25 increment) hybrid composites were synthesized by coating the surfaces of these composites with the conductive polymer polyaniline by in-situ polymerization method. The microwave absorption performances of hybrid composites are at a satisfactory level and can be used in potential military land applications. Keywords: Electromagnetic wave absorption, hybrid composite, carbon black, radar absorber, YIG.