Sol-Gel derived glass-ceramics
- Fukui Univ. of Technology (Japan)
Usually, glass-ceramics are prepared by heating the shaped dense glass for crystallization without deformation or cracks. In order to avoid deformation or cracks, the glass must be crystallized through whole body of the glass; that is, bulk nucleation and subsequent growth of the nuclei to crystals have to take place. Accordingly, the suitable compositions are limited. It has been shown that gels prepared by the sol-gel method, in which the starting solution containing metal compounds are converted to sols and subsequently to gels through the hydrolysis and polycondensation reactions of the compounds, are crystallized in the whole body, forming glass-ceramics without deformation or cracks. This indicates that the sol-gel method may broaden the composition range for glass-ceramics formation. The examination of the data on bulk and surface nucleations in glasses and gels indicate that the easy bulk nucleation in gels may come from micropore surfaces which give high water contents at the crystallization temperatures. Detailed explanation will be given.
- OSTI ID:
- 126602
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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