Thermodynamics of the Al_2O_3-SiO_2-Tio_x Oxide System at 1873K

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Isothermal phase relations for the Al<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub>–TiO<sub>X</sub> system have been investigated under strongly reducing conditions, achieved by equilibrium between graphite and CO gas, P<sub>O<sub>2</sub></sub>=4.56×10<sup>-16</sup> atm at 1873 K, in equilibria with a saturating oxide tablet.<BR> Activities of Al<sub>2</sub>O<sub>3</sub> and SiO<sub>2</sub> were measured by the Knudsen effusion method. Activities of SiO<sub>2</sub> were also measured by the chemical equilibrium between the oxide and the Fe–Si–C alloy. Activity of TiO<sub>X</sub> was also estimated from the composition of the Si–Al–Ti alloy in equilibrium with the oxide assuming that the alloy conformed to a regular solution. In addition, steel composition equilibrated with the oxide of arbitrary composition has been calculated by the activities of each component of the oxide system obtained in the present study.

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  • ISIJ international

    ISIJ international 42(5), 474-481, 2002-05-15

    The Iron and Steel Institute of Japan

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