A study on ion-exchanged, soda-lime glass's residual stress relationship with K+/Na+ concentration

In the past, studies have shown that the chemical composition within the exchanged layer could influence both the stress build-up magnitude and the stress relaxation rate. In this work, a novel approach was proposed to estimate the relationship between the stress relaxation parameters, the dilation coefficient, and the relative K+/Na+ concentration. The proposed method required knowledge of the residual stress profiles, the molten salt bath's temperature and soaking time, and the bath's composition. Based on the analyses performed on various residual stress profiles in ion-exchanged soda-lime glass, both the dilation coefficient and the magnitudes of the relaxation time constants were found to consistently decrease with K2O concentration.