アルカリアルミノケイ酸塩ガラス融液の粘性と混合アルカリ効果

概要

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The viscosities of(25-x)Na_2O・xK_2O・yAl_2O_3・(75-y)SiO_2 glasses between 1400-1000℃ and their transformation temperatures(Tg)were determined. In the case of mixed alkali glass melts with Al_2O_3/R_2O=0(R_2O=Na_2O+K_2O)a viscosity minimum, so-called mixed alkali effect has been found against K_2O/R_2O. However, mixed alkali aluminosilicate glass melts show no minimum but a linearity. This indicates that the mixed alkali effect in viscosity becames weaker or disappears with decreasing nonbridging oxygen content. On the other hand, although viscosity minima have been found at Tg curves, this mixed alkali effect in Tg showed an independence on Al_2O_3 content. The results of this experiment were compared with the previous work on the resistivity measurement in mixed alkali aluminosilicate melts and it has been concluded that the models for the mixed alkali effect in both properties(viscosity and electrical conductivity)have to be considered separately.
社団法人日本セラミックス協会の論文
1997-10-01