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Transformation Mechanisms of Cemented Silica and Crystalline Silica to Tridymite in Silica Bricks

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Interceram - International Ceramic Review

Abstract: Silica bricks with cemented silica and crystalline silica as raw materials show different properties. In this paper, the phase and structural characteristics of different kinds of silica raw materials and silica bricks after heat treatment at different temperatures are explored by the means of XRD, SEM and CT, and the formation mechanism of tridymite in the silica bricks is clarified. Results show that the liquid phase formed by impurities in both crystalline silica and cemented silica raw material cannot promote the transformation of quartz to tridymite at high temperatures. The phase composition of both cemented silica and crystalline silica after heat treatment at 1460 and 1550 °C is cristobalite.

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Zhang, Xh., Li, Y., Tian, Zh. et al. Transformation Mechanisms of Cemented Silica and Crystalline Silica to Tridymite in Silica Bricks. Interceram. - Int. Ceram. Rev. 71, 20–29 (2022). https://doi.org/10.1007/s42411-022-0505-0

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  • DOI: https://doi.org/10.1007/s42411-022-0505-0

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