Evaluation of the Microstructure of Magnesia-Zirconia Refractories

Ceramurgia + Ceramica Acta
ISSN 1970-0393
(Publication ceased)

Formerly "Ceramurgia"
Volumes No. 1 - 32 - ISSN 0045-6152
M.H. Amin-Ebrahim abadi, F. Golestani-Fard*, F. Moztarzadeh
Materials and Energy Research Center, Tehran, Iran
*University of Science and Technology, Tehran, Iran


Two 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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