SIMULATION OF PROCESSES OF DIFFUSION INTERACTION AT SINTING OF POWDER MATERIALS WITH THE USE OF HYDRODYNAMIC LUBRICATION THEORY

Powder material is a certain set of particles capable of plastically deforming both due to plastic shear of this set of particles, and due to sliding of the same set of contacting particles relative to each other. Making simulation, we proceeded from the fact that the model must have a finite number of features from the number inherent in the original object. At the same time, some of the properties of the object, when transferred to the model, could undergo a number of changes, which, having had insignificant effects on the object under study, could substantially simplify its theoretical-model representation. Using the structural model of diffusion interaction in powder materials, the process of densification and inelastic deformation of powder materials is described under the condition of plasticity using the liquid-dynamic theory of lubrication in a closed volume. Based on this, a theoretical analysis of the mechanism of sintering particles of iron-based powder materials was carried out. The effect of plasticizer introduction at different stages of product manufacturing on the basis of the proposed models of powder metallurgy processes is considered. The results of the scientific publication can be used in experimental studies of diffusion processes in the formation of powder materials and the choice of technological regimes.

internal friction coefficient, diffusion, diffusion processes during sintering, theory of sintering of powdered materials, the mechanism of sintering, dislocations, diffusion coefficient, modeling of processes in powder metallurgy

1. Skorokhod V. V., Shtern M. B., Martynov I. F. Theory of nonlinear viscous and plastic behavior of porous materials. Poroshkovaya metallurgiya = Powder metallurgy, 1987, no. 8, pp. 23–30 (in Russian).

2. Shtern M. B. The development of the theory of pressing and plastic deformation of powder materials. Poroshkovaya metallurgiya = Powder metallurgy, 1992, no. 9, pp. 12–24 (in Russian).

3. Beigel’zimer Ya. E., Hetman A. P., Alistratov L. I. The condition of plasticity to the powders of carbide composites. Poroshkovaya metallurgiya = Powder metallurgy, 1986, no. 12, pp. 11–15 (in Russian).

4. Balchin M. Y. Scientific basis of powder metallurgy and fiber metallurgy. Moscow, Metallurgiya Publ., 1972. 336 p. (in Russian).

5. Amosov A. P., Fedotov A. F. Version of the conditions of plasticity of powder materials. Poroshkovaya metallurgiya = Powder metallurgy, 2000, no. 3–4, pp. 4–10 (in Russian).

6. Sheleg V. K., Kovchur A. S., Pyatov V. V. Recycling of galvanic waste. Vitebsk, Vitebsk State Technological University, 2004. 185 p. (in Russian).

7. Myshkin N. K., Petrokovets M. I. Friction, lubrication, wear. Physical basis, technical application of tribology. Moscow, Fizmatlit Publ., 2007. 368 p. (in Russian).

8. Levanov A. N., Kolmogorov V. L., Burkin S. P., Kartak B. R., Ashpur U. V., Spassky U. I. Contact friction in the processing of metals by pressure. Moscow, Metallurgiya Publ., 1975. 352 p. (in Russian).

9. Skorokhod V. V., Solonin S. M. Physical-metallurgical fundamentals of sintering powders. Moscow, Metallurgiya Publ., 1984. 159 p. (in Russian).

10. Ivensen V. A. Phenomenology of sintering and certain questions of the theory. Moscow, Metallurgiya Publ., 1985. 245 p. (in Russian).

11. Ivensen V. A. Kinetics of the compaction of metal powders during sintering. Moscow, Metallurgiya Publ., 1971. 268 p. (in Russian).

12. Tikhomirov S. A. Mechanism of consolidation of metal powders of nickel and iron. Moscow, 2007. 26 p. (in Russian).

13. Dyachkova L. N., Kerzhentseva L. F., Markova L. V. Powder materials based on iron. Minsk, Topnic Publ., 2004. 227 p. (in Russian).

14. Geguzin J. E., Klinchuk Yu. I. Mechanism and kinetics of the initial stage solid state sintering of crystalline powders conglomerates. Poroshkovaya metallurgiya = Powder metallurgy, 1976, no 7. pp. 17–25 (in Russian).

15. Dyachkova L. N., Glukhova N. P., Zvonarev E. V., Samal’ G. I. Microtubular influence on structure and properties of powder carbon steel. Metallovedenie i termicheskaia obrabotka metallov = Metal Science and Heat Treatment, 1991, no. 1, pp. 3–11 (in Russian).

16. Gertsriken S. D., Dekhtiar I. Ia. Diffusion in metals and alloys in solid phase. Moscow, Fizmatgiz Publ., 1963. 320 p. (in Russian).

17. Andrievsky R. A., Ragulya A. V. Nanostructured materials. Moscow, Akademia Publ., 2005. 180 p. (in Russian).

18. Popov V. A., Kobelev A. G., Chernyshev V. N. Nanopowders in the manufacture of composites. Moscow, Intermet Engineering Publ., 2007. 336 p. (in Russian)