Silicon carbide materials obtained from rice husk
G. T. AdylovInstitute for Materials Science, “Solar Physics” Research and Production Corporation, Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanSh. A. FaizievInstitute for Materials Science, “Solar Physics” Research and Production Corporation, Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanM. S. PaizullakhanovInstitute for Materials Science, “Solar Physics” Research and Production Corporation, Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanS. S. MukhsimovInstitute for Materials Science, “Solar Physics” Research and Production Corporation, Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanE. Z. NodirmatovInstitute for Materials Science, “Solar Physics” Research and Production Corporation, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan
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Thermal processing of a rice husk sol in air at T≥750°C leads to the phase transformation of amorphous silicon dioxide (SiO2) into crystobalite (type B samples). Thermal treatment of the same sol at T≈ 1400 °C in a closed graphite crucible leads to the formation of a mixture comprising hexagonal SiC phases and graphite (type A samples). Unannealed type A samples showed high refractory properties, being stable up to 1650°C. Using kaolin binder in silicon carbide articles leads to a decrease in the material refractoriness.
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