Affiliation:
1. Faculty of Technology and Metallurgy, Department of Inorganic Chemical Technology, Belgrade
2. The Vinča Institute of Nuclear Sciences, Belgrade
Abstract
Three cordierite-type gels were prepared from an aqueous solution of
Mg(NO3)2, a boehmite sol and silica sols of very small particle sizes. The
effect of varying the silica particle size on the crystallization and
densification behaviour was studied. Phase development was examined by
thermal analysis and X-ray diffraction, while the densification behaviour
was characterized by measuring the linear shrinkage of pellets. The
activation energy of densification by viscous flow was determined using the
Franckel model for non-isothermal conditions and a constant heating rate.
The results show that spinel crystallizes from the colloidal gels prior to
cristobalite, and their reaction gives -cordierite, which is specific for
three-phase gels. Decreasing the silica particles size lowers the
cristobalite crystallization temperature and the -cordierite formation
temperature. The activation energy of densification by viscous flow is lower
and the densification more efficient, the smaller the silica particles are.
Publisher
National Library of Serbia
Cited by
12 articles.
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