AbstractTwo types of natural dead burned magnesia with different C/S ratios were doped with different amounts of Zr02. The phase development in bodies fired at 1750°C was studied by XRD and SEM/EDX. It was found that in magnesia with C/S ratio smaller than 1, Ca0-bearing silicate phases based on monticellite react with Zr02 and formed calcium-stabilized zirconia. In magnesia with C/S>4, zirconia reacts with Ca0-bearing phases forming calcium-stabilized zirconia and calcium zirconate. In both types of magnesias, addition of Zr02 helps the growth of periclase grains.
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