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Sintering and crystal growth of magnesia in the presence of lime and forsterite

Published online by Cambridge University Press:  05 July 2018

D. R. F. Spencer  and
D. S. Coleman
D. R. F. Spencer
Affiliation:
Department of Materials Technology, University of Technology, Loughborough, Leicestershire
D. S. Coleman
Affiliation:
Department of Materials Technology, University of Technology, Loughborough, Leicestershire
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Summary

The densification of pure magnesia was examined along with mixtures containing 0·5 and 1·0 mol % of calcium oxide and forsterite. The sintering behaviour at temperatures between 1400 and 1800 °C was studied and measurements made of changes in shrinkage, porosity, bulk density, and grain size for sintering times of up to 8 h at sintering temperature. It was found that both the 0·5 and 1·0 mol % additions enhanced the sintering of pure magnesia in the temperature range 1500–1700 °C Increased grain growth was found for mixtures containing forsterite but little change occurred for mixtures containing lime. Examination of the grain growth data showed that the mixtures obeyed a relationship: Time at temperature × Constant = (grain size)n, where n = 2 for the grain growth of pure magnesia and mixtures containing lime, but n = 3 for mixtures of magnesia with additions of a silicate such as forsterite. A value of 78 kcal/mole was obtained for the grain growth of pure magnesia, which agrees with other researches.

The extent of the solubility of lime in periclase for each lime-magnesia mixture at each temperature was also examined using electron probe analysis and related to the sintering behaviour observed for these mixtures.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 291 , September 1970 , pp. 839 - 851
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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