Conclusions
Conditions were worked out for the synthesis of β'-sialon on the basis of natural clay raw materials. It was established that the maximum yield of sialon is obtained from nitriding nonbriquetted mixtures of Novoselitsk kaolin and graphite. It was found that the yield of sialon is increased with a rise in the Al2O3∶SiO2 ratio in the clay material.
We studied the structure of the resulting sialon and also the kinetics of milling. It was shown that at 1450°C there forms β'sialon of variable composition: 0.58 (Al2O3·AlN)–0.42 Si3N4, and moreover a rise in temperature to 1700–1750°C leads to the displacement of the composition into the region adjacent to the AlN corner in the phase diagram for the Si-Al-O-N system and the appearance of the sialon with the structure of the polytype 15RAlN.
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Translated from Ogneupory, No. 4, pp. 44–48, April, 1982.
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Boyarina, I.L., Puchkov, A.B., Gavrish, A.M. et al. Sialon based on natural clay raw materials. Refractories 23, 191–196 (1982). https://doi.org/10.1007/BF01401014
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DOI: https://doi.org/10.1007/BF01401014