Synthesis of micro- and nanostructures with controllable composition in the chain plasma-chemical reactions initiated by the radiation of a powerful gyrotron in the mixtures of metal-dielectric powders

摘要

The report presents a new type of exothermic chainreactions initiated by powerful microwave radiation ofgyrotron in mixtures of metal-dielectric powders. In thismicrowave-plasma-chemical process new substances aresynthesized with controlled composition [1]. Chain self-sustaining reactions in which initially appearing productstake part in the formation of new products are the basis ofmany technological processes of synthesis of substances.Chain reactions occur usually at a high rate, and oftenhave the character of an explosion [2].Ceramic materials are widely used in modern tech-nology so they receive wider attention of the researchersdue to their unique mechanical and physical properties.Plasma methods are among the most promising tech-niques for the synthesis, modification, and processing ofmicro- and nano-structured ceramic materials [3]. Therehave been many examples of nanostructured materialsyntheses using various discharge types: spark, arc, glow,high-frequency, microwave, and so on. However, gyro-trons, being one of the most powerful sources of micro-wave discharges, have not been used in the regardedtechnology for a long time. This report will show the syn-thesis of -structures with controllable composition inchain reactions in powder mixtures: Mo+B, Mo+BN,Ti+B, W+B. A+-AlN, Mg+AlN+Al 2 O 3 , etc.