Thermal Explosion and Self-Propagating High-Temperature Synthesis in Mechanically Activated SiO
2-Al Mixtures
M. A. Korchagin1,2, E. G. Avvakumov1, G. G. Lepezin3, O. B. Vinokurova1
1Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630128 Russia
2Tomsk State University, Tomsk, 634050 Russia
3Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: aluminothermal reduction of SiO2, mechanical activation, thermal explosion, self-propagating high-temperature synthesis
Abstract
A thermal explosion and self-propagating high-temperature synthesis in low-calorific SiO2–Al mixtures subjected to preliminary mechanical activation are obtained. Results of x-ray and electron-microscopic investigations of the microstructure and phase composition of activated mixtures and reaction products are reported. It is found that complete reduction of quartz by aluminum occurs only in the thermal explosion mode.
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