Steklo i Keramika (Glass and Ceramics). Monthly scientific, technical and industrial journal

 

ISSN 0131-9582 (Online)

  • Continuous numbering: 996
  • Pages: 11-13
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Heading: Science for ceramic production

A gas-dynamic model of the formation of open and closed porosity of materials under the conditions of combustion of an SHS system, when there is a liquid phase (which can boil under certain conditions), the pressure of impurity gases, vapor of the liquid phase, external pressure or vacuum, is considered. It is shown that there is a critical pressure that characterizes the transition boundary between closed and open porosity. Experimental studies for the Ti - C system showed that the size of the open pores of the synthesized sample, measured over the sample volume, correlates with the calculated values ??that were obtained when considering the gas-dynamic model of the formation of open porosity using the theory of cavitation. Il. 3, bibliography: 9 titles.
Merzhanov A.G. Problems of technological combustion // Processes of combustion in chemical technology and metallurgy. Chernogolovka, 1975.S. 5-28. Bloshenko V. N., Bokiy V. A., Boyarchenko V. I. et al. Porous materials based on titanium carbide obtained in combustion mode // Sb. thesis. II All-Union. symp. on promising metallic materials, May 12 - 17, 1991, M., 1991. P. 29. Merzhanov A.G., Rogachev A.S., Mukasyan A.S. et al. Macrokinetics of structural transformations in gasless combustion of powder mixtures titanium and carbon // FGV. 1990. T. 26. N 1. P. 104. Shcherbakov V. A., Sychev A. E., Shteinberg A. S. Macrokinetics of degassing in the process of SHS // FGV. 1986. T. 22. N 4. S. 55. Bloshenko VN, Bokiy VA, Borovinskaya IP et al. Adsorption-diffusion theory of impurity oxygen evolution from solid flames // III Int. Seminar on Flame Structure, 18 - 23 Sept., 1989. Alma-Ata, 1989. P. 100. Chirkin VS Thermophysical properties of materials: ref. allowance. M .: State. Publishing house of physics and mathematics. lit., 1959.356 p. Martynyuk M.M., Tamanga P.A., Kravchenko N. Yu. Diagram of titanium state in the region of liquid-vapor phase transition // Bulletin of RUDN. Ser. Physics. 2002. N 10. Issue. 1. P. 121 - 125. Knapp R., Daly J., Hemmit F. Cavitation. Moscow: Mir, 1974.687 p. Bakunov V.S., Balkevich V.L., Guzman I. Ya. Et al. Workshop on the technology of ceramics and refractories. Moscow: Stroyizdat, 1972.352 p.

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V. I. Uvarov, I. P. Borovinskaya, and E. S. Lukin Gas-dynamic model of open and closed porosity formation in self-propagating high-temperature synthesis. Steklo i keramika. 2010:83(12):11-13. (in Russ). UDK 666.76-128