Combined wet comminution is used to prepare HCBS of composite composition, including fuzed bauxite-corundum as a basic material (89%) and very fine fuzed quartz (11%). Specimens are also based on this HCBS with an increased Al2O3 content due to introducing 10 – 30% reactive alumina into their composition. Dilatometric studies are performed making it possible to establish that for materials of all compositions there are four typical nonisothermal heating temperature ranges: normal thermal expansion (up to 900°C), sintering or shrinkage (900 – 1300°C), mullitization or growth (1300 – 1450°C), and sintering (shrinkage) of mullitized material (1450 – 1500°C).
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Notes
Subsequently original castings without addition of alumina will be designated as a condition of bauxite-corundum HCBS, although they contain 11% VFQG.
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Translated from Novye Ogneupory, No. 2, pp. 39 – 45, February 2017.
Parts 1 – 3 of the article were published in Novye Ogneupory Nos. 8, 10, and 12 (2015), and parts 4 – 8 in Nos 2, 4, 6, 10, and 12 (2016).
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Pivinskii, Y.E., Dyakin, P.V. & Kolobov, A.Y. Research in the Field of Preparing Molded and Unmolded Refractories Based on High-Alumina HCBS. Part 9. Preparation and Properties of Mixed HCBS Composition: Fuzed Bauxite-Corundum, Quartz Glass, Reactive Alumina. Dilatometric Study of Materials Based on Them. Refract Ind Ceram 58, 103–108 (2017). https://doi.org/10.1007/s11148-017-0062-7
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DOI: https://doi.org/10.1007/s11148-017-0062-7