A study is made of the effect of additions of clay and Y2O3 and the temperature difference in the range 1000/20 – 1500/20°C on the growth of the crystalline phases in ceramic specimens obtained by the conventional sintering of component mixtures at 1300 and 1500°C. The effects of these additions and the temperature difference on the dimensions of the crystals, elastic modulus, ultimate flexural strength σbnd, and the linear correlation between elastic modulus and σbnd are also examined. The rate of crystallization of the mullite phase and tetragonal Zr2O3 and the associated increase in crystal size are greatest in specimens sintered at 1300°C and subjected to thermal shock with temperature differences of 1400/20 and 1500/20°C. Such specimens have the highest values for elastic modulus and σbnd and are characterized by the existence of a linear correlation between elastic modulus and σbnd.
Refractories and Industrial Ceramics – Springer Journals
Published: Dec 9, 2014
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