21 November 1997 Spreading of the combustion wave in SiO2-Al systems
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The process of self-propagating high-temperature synthesis (SHS) has been applied as the new technology for production of construction materials and especial refractories with enhanced strength- and fire-resisting properties. These materials are aimed to be used as synthetic mullits lining refractories in heat units. In the visible light range, the following characteristics of SHS process have been investigated: the localization and the temperature of initiating of SHS process,the propagation of SHS wave on surface- or in volume, velocities of spreading of combustion wave, the number of SHS reaction stages. The visualization with a video-recording of the combustion wave of the SHS process has been performed inside the muffle furnace. The video has been processed with computer card of frame grabber and has been analyzed in multivideo mode, where each frame had been captured in fixed time interval. Thus, several mixtures of SiO2-Al have been studied by variation of: the SiO2 particle size,the stoichiometric coefficient, by the substitution of the SiO2 to ashes and kaolin, and by the adding of supplementary components like Fe2O3. The SHS reactions are processed by the preliminary heating to the temperature of 650-860 degrees C. The local thermal self initiating of the SHS process and its propagation in the volume of a sample have been visualized. The multistage SHS reaction has been identified.
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Vladimir M. Maltsev, Galina P. Gafiyatulina, Alexander V. Tavrov, "Spreading of the combustion wave in SiO2-Al systems", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); doi: 10.1117/12.293419; https://doi.org/10.1117/12.293419

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