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Effect of Na 2 O/K 2 O Ratio on Chemical Durability of Alkali‐Lime‐Silica Glasses
Author(s) -
SEN SUDHIR,
TOOLEY F. V.
Publication year - 1955
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1955.tb14924.x
Subject(s) - alkali metal , alkalinity , potassium , chemistry , chemical composition , ion exchange , sodium , lime , inorganic chemistry , silicon , durability , mineralogy , soda lime , ionic bonding , ion , materials science , metallurgy , composite material , organic chemistry
The chemical resistance of mixed‐alkali glasses to water was measured by determining the sodium, potassium, calcium, and silicon ions extracted instead of evaluating it from the alkalinity of the mixed‐alkali extracts. In glasses of the composition K 2 O and Na 2 O 18, CaO 10, and SiO 2 72% the minimum extraction of alkali (maximum durability) occurred for a K 2 O/‐Na 2 O ratio of 2.6/1.0 (by weight). Based on an ionic‐composition analysis of the results, an empirical index is suggested for determining the relative degree of ion‐exchange and network‐breakdown modes of reactions that occur when such mixed‐alkali glasses are attacked by water.