Thermal Behavior of Glass Fiber

Abstract

Thermal behaviors of glass fiber have been studied by measuring their linear thermal expansion. The low transition temperature (T1) and the high transition temperature (T2) decreased with increasing spinning speed and with decreasing spinning temperature. These results suggest that the low transition temperature (T1), which changes with thermal history, is associated with alkali diffusion in glass fiber, while the high transition temperature (T2) is related to the degree of orientation of glass structure.The time effect on the recovery was measured at various temperatures in the transition region, and the isotherms were found superposible closely each other by horizontal shifts. The temperature dependence of the logarithmic shift factor (log aT) was in accord with the W. L. F. equation in the temperature range above 500°C, but diverged from the equation at lower temperatures.