Estimation of glass viscosity and glass ceramic compositions in temperature interval of their foaming

The proposed method was used to determine the values ??of the viscosity of glass and glass-crystalline compositions in the temperature range of foaming. It was found that when the glass-crystalline composition contains less than 75% of the glass phase, its viscosity depends on the ratio of the crystalline and glassy phases, with the content of more than 75% - the viscosity of the composition and the coefficient of foaming are determined mainly by the composition of the glass phase. Tab. 2, ill. 3, bibliography: 5 titles.