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Information × Registration Number 0221U106523, 0121U110912 , R & D reports Title Development of a new class of metal-ceramic composites from powders of superhard reinforced ceramics for extreme operating conditions popup.stage_title Head Loboda Petro I., Registration Date 09-12-2021 Organization National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" popup.description2 The report on this stage of work is presented on 102 pages, contains 59 illustrations, 19 tables and a list of references containing 34 sources. COMPOSITE MATERIAL, SPARK PLASMA SINTERING, HIGH ENTROPIC ALLOY, REINFORCED CERAMICS Object of the research - composite materials in the system WES- (WC-W2C) / (B4C – TiB2) Aim of the the research - creation of physical and chemical bases of control of processes of synthesis of a new class of high-strength composite materials from powders of reinforced refractory compounds (RC) and high-entropy alloys (HEA). Research methods - spark plasma sintering (SPS), Cold spraying (CS), electron microscopy with EDS, X-ray phase analysis, mathematical modeling of stresses in composite material, dilatometric studies Mechanisms for compaction of composite coatings based on high-entropy AlNiCoFeCr alloy with refractory compounds such as TiB2, B4C-TiB2 The density, size and homogeneity distribution of phase components and porosity on volume of a covering from composite material of HEA- (B4C–TiB2) are established. The regularities of change of magnitude and sign of mechanical stresses in phase components of TC-HEA composites depending on chemical composition, parameters of cooling heating processes are established. The conditions of formation of composite material with minimal internal stresses are established by studying the influence of material nature (WC-W2C/В4СТiВ2-HEA), technological parameters of compaction process (temperature, cooling rate) and cold gas-dynamic spraying on stress-strain state. The values of macro- and micro-stresses that occur in the phase components of composite materials during cold gas-dynamic coating of coatings were determined by the method of X-ray diffraction analysis. After heat treatment, macro- and micro-stresses are reduced by 1.5-2 times in all components of composites, but their value remains dependent on the temperature of the CS process, which may be due to dislocation defects formed in the coatings. Product Description popup.authors Bohomol Yurii Ivanovych Vterkovskyi Mihael Ya Nakonechnyi Sergyi O Solovіova Tetіana O. Solodkii Yevgen V. Teslya Sergiy Yu Trosnikova Iryna Yu. Yurkova Oleksandra I popup.nrat_date 2021-12-09 Close