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Information × Registration Number 0224U001471, 0121U100521 , R & D reports Title Obtaining by the method of free sintering and hot pressing of functional composites for electrical purposes with a ceramic matrix based on nitrides for operation at elevated temperatures popup.stage_title Head Fesenko Ihor P., д.т.н. Registration Date 23-01-2024 Organization V. Bakul Institute of superhard material of the National Academy of Sciences of Ukraine popup.description2  A polycrystalline material based on aluminum nitride was obtained by hot pressing. AlN compaction dilatograms at 1700–1900 °C were determined. The Avrami-Yerofeev equation of topochemical reactions was used to describe the kinetics of sintering, the densification constants and the sintering activation energy of AlN powders were calculated. Ceramic composites based on AlN with additives (up to 25% vol.) of titanium nitride and diboride, titanium carbide, molybdenum and tungsten were obtained by means of free sintering. Exact values of the dielectric characteristics of the obtained composites in a wide range of frequencies, as well as electrical resistance and thermal conductivity have been revealed. These values can be used to calculate theoretically sizes of parts of bulk absorbers in such microwave devices as traveling wave tubes (TWT) and klystrons. The obtained composite materials of high thermal conductivity were used at the Scientific Research Institute of Experimental Research at the Igor Sikorsky National Technical University for the development of a broadband high-voltage amplifier with virtual power. Product Description popup.authors Kaidash Oksana М. Marchenko Anatoliy A. Romanko Lydmula O. Sergiyenko Nina V. Sorochenko Tetiana A. Tkach Vasyl' M. popup.nrat_date 2024-01-23 Close