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High Pressure Research
An International Journal
Volume 20, 2001 - Issue 1-6
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Original Articles

Preparation of ceramics by hydrothermal hot-pressing

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Pages 343-349 | Received 10 Jan 2000, Accepted 25 Feb 2000, Published online: 19 Aug 2006
 

Abstract

The densification mechanism of borosilicate glass, silica gel and amorphous titania powders by hydrothermal hot-pressing is described. The glass powders were densified by a viscous flow mechanism, and fully dedfied compacts were obtained by hydrothermal hot-pressing. On the other hand, porous ceramics were produced from silica gel and amorphous titania. The pore size distribution of these ceramics could be controlled by hydrothermal hot-pressing conditions. In the case of silica gel, it remained amorphous, but amorphous titaaia was crystallized to anatase by hydrothermal hot-pressing. The pore diameter and mechanical strength of the compacts prepared from silica gel increased with reaction time. The densification of the amorphous titania was improved by increasing temperature and pressure.

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