Methods of Increasing Strength of Aluminosilicate Ceramics Based on Semi-Flint Clay Raw Materials

Abstract:

The paper investigates the peculiarities of the chemical and mineralogical compositions of semi-flint kaolins and their behavior under heating up to 1500 °C. It was found that the sintering process of kaolin clay raw materials depends on the temperature of their preliminary calcining, method of milling after the thermal treatment and application of mineralizing additives. In the case of Borovichy kaolin, preliminary calcining at 850 °C and 980 °C and its subsequent milling increase the material strength after sintering calcining at the temperature of 1400–1450 °C at the expense of uniform sintering and the formation of a homogeneous microstructure of sintered material.

• Periodical: Key Engineering Materials (Volume 743)
• Pages: 426-430
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.743.426
• Online since: July 2017
• Authors: Tatyana V. Vakalova, Larisa P. Devyashina*, Anastasia P. Potapova
• Keywords: Kaolin, Mineralizing Additives, Mullite Synthesis, Semi-Flint Clays, Sintering

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