Chemical Durability Improvement and Static Fatigue of Glasses.
Annual rept. no. 2, 31 Mar 79-25 Feb 80,
RENSSELAER POLYTECHNIC INST TROY N Y DEPT OF MATERIALS ENGINEERING
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Chemical durability of glass can be improved by applying a coating on the surface. It was also found that an addition of a minor quantity of calcium to the alkaline solution drastically improves the durability of glass. It was confirmed that calcium is deposited on the glass surface and protects the glass. It is suggested that this phenomenon of sorption is playing a important role in the chemical durability of glasses. The strength of glass is strongly influenced by the environment in which it is measured, but the exact cause of the phenomenon is not clear. Mechanical strength of high silica glass was measured in various liquids, as a function of strain rate. At a constant strain rate, the strength of glass measured in various liquid correlated well with the volume change of a high silica porous glass immersed in various liquids. These phenomena in turn showed a good correlation with the surface energy reduction of glass in liquids. These experiments suggest that the surface energy produces the mechanical stress which causes the volume change of porous glass and this stress influences the mechanical strength of glass. Author
- Ceramics, Refractories and Glass