| Water Attack on Na20-Mg0-Si02 Glasses
in Relation to their Structure |
C. R. DAS
Pages : 145-150
DOI : 10.1080/0371750X.1970.10855744 |
| Abstract |
| Glasses in the system Na20-Mg0-Si02 containing various amounts of Na20
and MgO were subjected to the action of water and the amounts of the constituents
extracted were analysed chemically. The effect of MgO in increasing the resistance
towards water attack was strong only in glasses having 20 mole per cent or more
of Na20.
The molar ratio Si02 : Na20 in the extract was not the same as in the glass. Generally
it increased with an increase of the Si02 : Na20 ratio in the glass composition.
The molar ratio of MgO to Si02 in the extract decreased with increasing value of
the same in the glass and was nil at about 20 to 31 mole per cent of alkali in the glass.
Values of the equilibrium pH were determined for all the glasses. At a constant
Na20 content, the pH values passed through a minimum with the replacement of Si02
by MgO. The results were interpreted in relation to the oxygen activity of the glass.
Equilibrium pH also appeared to have linear relationship with logarithm of alkali
extractions, with slopes varying with the alkali content. |
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