Young's modulus of heatproof tile ceramics Letovice during firing

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  • TRNÍK Anton
    Physics Department, Constantine the Philosopher University Department of Materials Engineering and Chemistry, Czech Technical University
  • ŠTUBŇA Igor
    Physics Department, Constantine the Philosopher University
  • VARGA Gabriel
    Physics Department, Constantine the Philosopher University
  • BAČÍK Peter
    Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University
  • PODOBA Rudolf
    Physics Department, Constantine the Philosopher University

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Mechanical behavior of the heatproof stove tile ceramic material Letovice, which consists of kaolinitic clays and quartz, and small amount of mica, calcite and feldspar, was studied using the non-destructive sonic resonant method mf-TMA. To find actual dimensions and the volume mass of the sample, thermodilatometry and thermogravimetry were carried out in the same temperature regime (20–1100°C, 5°C/min) as mf-TMA. It was found that liberation of the physically bounded water from the green mass makes Young’s modulus higher. Dehydroxylation of phyllosilicates and the α → β transformation of quartz affect Young’s modulus to a lesser degree. The collapse of phyllosilicates structure above 900°C and the creation of mullite cause an increase in Young’s modulus.

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