Dependence of the parameters of equations of viscous flow on chemical composition of silicate melts

Optimal thermal cycle for production of glass–ceramic based on wastes from ferronickel manufacture

“…These variations can lead to some decreasing of the viscosity [27] as well to the reduced trend for spontaneous uncontrolled crystallization.…”

3D diagrams of equations of viscous flow of silicate glass-forming melts

“…In this paper we also want to transform the VFT and the MYEGA equations so that they include the effect of lubricants as it was done in [14] for the AM equation. As it was mentioned in [28] a very small amount of Network Modifiers (NM) added to pure SiO 2 can cause a drastic decreasing of viscosity at the temperature equivalent to the T g of pure SiO 2 .…”

“…As it was mentioned in [28] a very small amount of Network Modifiers (NM) added to pure SiO 2 can cause a drastic decreasing of viscosity at the temperature equivalent to the T g of pure SiO 2 . In [14] the principal advantage of the AM model is considered to be its ability to reflect this effect as the model is based on average jump frequency. In contrast to this, it is assumed that the models based on average activation energy cannot adequately reflect this effect.…”

“…(6), which connects logη ∞VFT and logη ∞A is derived assuming that logη Tg = 13.5 [dPa·s]. However, in [14] dependency for the viscous flow from composition was derived through the AM model using the referential temperature T r for which logη Tr = 13[dPa·s]. We will for all our future derivations use as a referential temperature this temperature T r (at which logη Tr = 13[dPa·s]) instead of T g .…”

“…Avramov in [14] uses referential temperature T r instead of T g . Referential temperature T r is the temperature at which the viscosity is 10 13 [dPa·s].…”