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New classes of ceramic and metal-ceramic materials Dispersion-strengthened and dispersion-hardened alloys

Новые классы керамических, металлокерамических материалов. Дисперсно-упрочненные и дисперсионно-твердеющие сплавы
1. Dispersion-strengthened-type ceramic materials based on titanium carbide with the effect of simultaneous dispersion strengthening of carbide grains and metal binder as a result of concentration separation (the occurrence of controlled transformations in a solid solution) of supersaturated solid solutions and the release of excess nanodispersed phases both inside the carbide grains (e.g., MeVC or MeV-type phases) and metal binding (e.g., the γ′-phase). The fundamental novelty of the materials science approach to designing these materials is as follows. Supersaturated solid solutions can be obtained under conditions of high temperature gradients achieved in the combustion wave of the SHS systems. In accordance with the equilibrium state diagrams, alloying elements are accumulated at high concentration in the area of structurization of solid solutions due to high combustion temperature (up to 2500–3500 °С). Upon rapid cooling at rates of ~ 102–103 °С/s, these alloying elements cannot leave the crystal lattice; thus, the solid solution becomes supersaturated. However, subsequent thermal treatment results in concentration separation of solid solutions and the release of excess nanodispersed phases. Thermal treatment conditions, degree of supersaturation, and features of the state diagram allow one to control the size of precipitations-excess phases, whose release results in a considerable enhancement of physicomechanical properties. Hardness, crack growth resistance, ultimate strength, and impact resistance increase simultaneously. 2. Ceramic materials (based on carbides, nitrides, and borides) with the modified structure obtained by introducing of nanosized additives of refractory compounds to the initial mixture, which act as modifiers during the primary and secondary structure formation process via the liquid phase, to the initial mixture. The effect of nanosized additives to the macrokinetic combustion parameters and structure formation of various SHS systems was first studied. The effect of strong modification of the structure of synthesis products was revealed; this effect resulted in a simultaneous increase in strength, hardness, and crack growth resistance. The production technology of these materials was implemented under experimental and industrial conditions.


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Ph.D, Doctor of Science Full Member of the Russian Academy of Natural Science, Head of the Scientific- Educational Center of SHS, Head of the Department of Powder Metallurgy and Functional Materials
Ph.D Leading Research Scientist, Scientific secretary of the Scientific-Educational Center of SHS, Associate Professor of the Department of Powder Metallurgy and Functional Coatings
Ph.D., Junior Research Scientist of the Scientific-Educational Center of SHS
Ph.D., Senior Research Scientist of the Scientific-Educational Center of SHS, Associate Professor of the Department of Powder Metallurgy and Functional Coatings
Ph.D Senior Research Scientist of the Scientific-Educational Center of SHS
PhD student


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