Thermal study of the influence of chemical composition on CRT glass crystallization

Abstract

The influence of alumina oxide on the crystallization of silica-strontium-barium glass from cathode ray tube (CRT) was studied by means of thermal analysis. Thermal characteristics of glasses such as the transition temperature T g , the crystallization temperature T c and thermal stability parameter were determined by DTA/DSC method. The crystallization ability of the obtained glasses was also determined independently by the gradient furnace technique. The crystalline phase was determined by the X-ray diffractometry. The microstructure of the samples was studied by SEM technique. The linear expansion coefficients of glasses as a function of temperature were measured. Analysis of the local atomic interactions in the structure of glasses was used to explain the course of the crystallization. The effect of Al 2 O 3 content on the CRT glass composition was studied by FTIR and solid-state 19 F MAS-NMR spectroscopy.