Mechanical, thermal, and structural investigations of chemically strengthened Na2O–CaO–Al2O3–SiO2 glasses

Abstract

For a series of conventional soda-lime-silicate glasses with increasing Al2O3content, we investigated the thermal, mechanical, and structural properties before and after K+-for-Na+ion-exchange strengthening by exposure to molten KNO3. The Al-for-Si replacement resulted in increased glass network polymerization and lowered compactness. The glass transition temperature (Tg), hardness (H) and reduced elastic modulus (Er), of the pristine glasses enhanced monotonically for increasing Al2O3content.HandErincreased linearly up to a glass composition with roughly equal stoichiometric amounts of Na2O and Al2O3where a nonlinear dependence on Al2O3was observed, whereasHandErof the chemically strengthened (CS) glasses revealed a strictly linear dependence.Tg, on the other hand, showed linear increase with Al-for-Si for pristine glasses while for the CS glasses a linear to nonlinear trend was observed. Solid-state27Al nuclear magnetic resonance (NMR) revealed the sole presence of AlO4groups in both the pristine and CS glasses.23Na NMR and wet-chemical analysis manifested that all Al-bearing glasses had a lower and near-constant K+-for-Na+ion exchange ratio than the soda-lime-silicate glass. Differential thermal analysis of CS glasses revealed a “blurred” glass transition temperature (Tg) and an exothermic step belowTg; the latter stems from the relaxation of residual compressive stresses. The nanoindentation-derived hardness at low loads and <5 mol% Al2O3showed evidence of stress relaxation for prolonged ion exchange treatment. The crack resistance is maximized for molar ratiosn(M(2)O)/n(Al2O3)≈1for the CS glasses, which is attributed to an increased elastic energy recovery that is linked to the glass compactness.