Transactions of the INDIAN CERAMIC SOCIETY Vol. 43 1984
Crystallization of MgO-AI203-Si02 Glasses with Zirconium
Dioxide, Titanium Dioxide and Copper Oxide
AsoK DE, A. K. MoiTRA AND P. K. GuPTA
Pages : 105-109
DOI : 10.1080/0371750X.1984.10822693
Abstract
Crystallization of Mg0-AI20 3-Si02 glasses containing small
amounts of Zr02 with or without Ti02 or Cu20 was studied. In
addition to high mechanical strength and indentation hardness the
crystallized glasses possessed ultra-high alkali resistance. X-ray diffraction
studies revealed the presence of 8-quartz and tetragonal
zirconia or Cu20 at the initial stages of crystallization, while cordierite,
zircon, cristobalite etc appeared at elevated temperatures.
DTA curves showed that crystallization was accelerated on addition
of Ti02 or Cu20 while scanning electron micrographs also exhibited
dense crystallization below 1000°C. Partial substitution of Ti02 by
Zr02 improved the working characteristics of glasses melted for the
production of conventional cordierite glass-ceramics; corrosion of
refractories was also significantly reduced.
