Thermal shock properties of chemically toughened borosilicate glass

摘要

This paper describes an experimental test of the unified theory of thermal shock. A borosilicate glass (78.1%SiO_2-13.3%B_2O_3-4.7%Na_2O-3.4%Al_2O_3) subjected to ion-exchange in molten KNO_3, was used. The theory predicts the critical temperature difference fro fracture initiation by thermal shock; however, it overestimates the number of cracks which propagate simultaneously. Despite that fact, taken into account the numerous assumptions of the theoretical model and the possible experimental errors, our results indicate a fair agreement between theory and experiment.