混合アルカリ鉛珪酸塩ガラス融液の粘度

概要

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The viscosity of melts in the system R_2O (R=Na, K, Li+Na, Na+K, K+Li, and Li+Na+K)-PbO-SiO_2 was measured by the platinum ball pulling-up method at temperatures ranging from 1 000° to 1 400℃. The results obtained are summarized as follows : (1)In connection with the fact that the glass contains a small amount of alkali it is found that, on the molar bases, the potash glass is more viscous than the soda glass. (2)The effect on the material that is charged with alkali is observable in the Li-K glass containing two different kinds of alkalis i. e., Li_2O and K_2O. (3)In the Li-Na-K glass containing constant quantity of 2.5 mol. % Li_2O or K_2O, the minimum of viscosity is observable at the molar concentration ratio (β_k and _<Na>) of about 0.33. But, in the glass containing constant quantity of 2.5 mol. % Na_2O, it is observable at molar concentration ratio (β_<Li>) of about 0.5. (4)The same tendency of composition and the correlation between the viscosity and the apparent activation energy of viscous flow is also observable.
社団法人日本材料学会の論文
1972-07-15