| Autor: |
Hosoi, Kazuyuki, Kawai, Susumu, Yanagisawa, Kazumichi, Yamasaki, Nakamichi |
| Zdroj: |
Journal of Materials Science; December 1991, Vol. 26 Issue: 23 p6448-6452, 5p |
| Abstrakt: |
Low-temperature sintering of spherical glass powders with the same particle size was attempted by hydrothermal hot pressing at 260 °C. The microstructure of densified bodies was observed by scanning electron microscope and the existence of water in the surface reaction layer was confirmed by Fourier transform infrared spectroscopy. The reaction layer was formed on the surface of spherical glass particles after hydrothermal hot pressing. The thickness of the layer increased with reaction time. The layer was deformed and layers stuck together by mechanical compression. The reaction layer contained much molecular water. The kinetics of the formation rate of the reaction layer was agreed with Kondo's equation, [1 - (1 - X)1/3]N=kt where t = reaction time, X = reaction ratio of glass, and N= a constant. N is 1 at the initial stage and 2 at the secondary stage. These values show that hydration on to the surface at the initial stage, and diffusion of water in the reaction layer at the secondary stage, are the rate determining steps. |
| Databáze: |
Supplemental Index |
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