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- W2289741736 abstract "A significant increase in the physicomechanical and operational properties of sintered composition materials can be attained through the predictable formation of structures within the volume of sintered items. An effective method of actively affecting the structure of composition materials involves their treatment with metal melts. In the case of hightemperature interaction with metallic melts a number of processes are generated within sintered materials: the absorption of the liquid phase by nonporous compositions, the penetration of the liquid through the contact boundaries of the particles, a restructuring of the high-melting skeleton, etc. [ 1 ]. In order to be able to predict within these compositions the formation of various structures, it is necessary that we study the thermodynamics involved in the migration process of the liquid phase in sintered materials. Such studies are available with respect to two-phase systems [1]. Questions related to the thermodynamics of migration for metallic melts in multiphase sintered composition materials have not been adequately studied. The migrational thermodynamics of molten metal in three-phase compositions has been studied on a model consisting of n particles in phase 1, the particles of phase 2, and the liquid phase 3. There was a region I within the system, containing the particles in solid phases 1 and 2 and liquid 3, as well as a region II which consisted entirely of liquid (see Fig. 1). Particles 1 and 2 in region I were in contact with each other, with neighboring particles, and with the liquid, i.e., they formed two interpenetrating skeletal structures, which corresponds to the real structures of compositions based on highmelting phases. We will assume that the liquid provides good wetting for the high-melting particles. This condition is necessary for the existence of composition material as a physical object. The regions are separated by a diaphragm which is permeable to the liquid phase. We made the assumption that some volume AV 3 of liquid penetrated through the diaphragm out of regions II into I, as a result of which the system made a transition from its initial state a to the final state b. On transition of the liquid AV s out of region II into I the following changes occurred with:,n the system: the volume of region II diminished and the volume of region I increased," @default.
- W2289741736 created "2016-06-24" @default.
- W2289741736 creator A5029314506 @default.
- W2289741736 date "1991-01-01" @default.
- W2289741736 modified "2023-09-26" @default.
- W2289741736 title "We have derived the thermodynamic functions describing the change in the energy of a system on penetration of a liquid into three-phase sintered compositions, and we offer a prediction with respect to the structures which will develop as a result, in addition to examining the moving forces of this process." @default.
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