Influence of Al₂O₃/SiO₂ Ratio on the Structure and Properties of Na⁺ / K⁺ Ion Exchange Na₂O-MgO-Al₂O₃-SiO₂ Glasses

Abstract

In this work, the structure, viscosity and ion-exchange process of Na₂O-MgO-Al₂O₃-SiO₂ glasses with different Al₂O₃/SiO₂ molar ratios were investigated. The results showed that, with increasing Al₂O₃/SiO₂ ratio, the simple structural units Q₁ and Q₂ transformed into highly aggregated structural units Q₃ and Q₄, indicating the increase of polymerization degree of glass network. Meanwhile, the coefficient of thermal expansion decreased from 9.23×10⁻⁶ °C⁻¹ to 8.88×10⁻⁶ °C⁻¹. The characteristic temperatures such as melting, forming, softening and glass transition temperatures increased with the increase of Al₂O₃/SiO₂ ratio, while the glasses working temperature range became narrow. The increasing Al₂O₃/SiO₂ ratio and prolonging ion-exchange time enhanced the surface compressive stress (CS) and depth of stress layer (DOL). However, the increase of ion exchange temperature increased the DOL and decreased the CS affected by stress relaxation. There was a good linear relationship between stress relaxation and surface compressive stress. Chemical strengthening significantly improved the hardness of glasses, which reached the maximum value of (622.1 ° 10) MPa for sample with Al₂O₃/SiO₂ ratio of 0.27 after heat treated at 410 °C for 2 h.

Keywords

network structure / viscosity / ion exchange / aluminosilicate glass

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