Design reactor for synthesis of radar absorption material by mechanochemical method and development of absorbing material by additives

The advanced technology materials, which cannot be produced by conventional methods, manufacture by using methods such as; size reduction, solid state reactions and mechanical alloying. For these production methods different mill types may be used. Energy factor is highest in the shaker mills compared to other mills. On the other hand, reactors of the shaker mills are small and at a time 10-20 grams powder can be produced. To increase milling amount per time big volume reactors were designed and manufactured. These reactors were used in RAM production experiments to test their performance.Design reactors diameters are 59 mm and 90 mm. For pilot scale productions 90 mm diameter reactor was designed but this reactor cannot be used in the shaker mills found in market. Therefore; to fix this reactor 12 holder high energy mill was designed and manufactured. Finite element analyze was used to investigate energy factor of the designed mill and it was compared to the shaker mill found in the market (SPEX 8000). Radar absorption materials are quite expensive and strategic materials, therefore these materials can buy without free trade and only by international friendship relations. Because of these reasons; the aim of this thesis is to produce radar absorption material with better performance in our country. Nickel and cobalt ferromagnetic materials and chromium and boron non-ferromagnetic materials were used as additive to iron silicide which is used as RAM. XRD, TGA analyzes and absorption capacity measurements were done to optimize additive amounts. Application of a patent was also done for designed 12 holder high energy mill. In addition to this, by using this mill iron silicides were produced with additives and Curie temperature and absorption capacities were determined. According to these results; chromium and boron additive iron silicides were reached to - 10 dB absorption capacity so they can be used as RAM. In addition to this, cobalt additive iron silicides' Curie temperature is higher than pure iron silicide so it can be used as RAM for high temperature (6000C) applications. On the other hand, nickel additive iron silicide cannot be used as RAM because of its low absorption capacity and Curie temperature.