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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 51  1992
Activated Sintering of Natural Magnesites in Presence of Titanium Dioxide
M. CHAUDHURI (nee NAm), A. KuMAR and G. BANERJEE
Pages : 130-135
DOI : 10.1080/0371750X.1992.10804560
Abstract
The sintering and grain growth of natural Indian magnesite as a function of added titania have been studied in the range 0.05 to 0.50 wt% Ti01 with respect to the natural magnesite. Grain sizes in fired compacts have been measured with the aid of an optical microscope on thin and polished sections. The activation energy for grain growth In magnesites with and without added titania has been calculated from the Increase in average grain diameter as a function of firing temperature and time. A higher activation energy of 607 k.J/mol has been observed In the case of natural cryptocrystalline magnesite from Salem with 0.20 to 0.50 wt% titania addition when compared to the activation energy of 293 k.J/mol in natural coarse crystalline magnesite from Almora with 0.50 wt% added titania in the original magnesite. The higher activation energy is attributed to change in the mechanism of sintering due to the addition of titania.
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