Network Structure and Chemical Durability of Non-alkali Aluminoborosilicate Glasses Containing ZnO

Abstract

The structure and chemical durability of non-alkali aluminoborosilicate glasses with various contents of ZnO were investigated. As the replacement of MgO by ZnO increases from 0 to 3.2mol%, the average number of bridge oxygen per tetrahedron (BO/T) as a measure of network connectivity increases from 2.84 to 3.04, and the chemical durability improved. The weight loss ratio (WLR) of glass etched in 10vol% HF (20 °C, 20 min) solution decreased from 4.809 to 4.509, and in 5wt% NaOH (95 °C, 6 h) solution decreased from 1.201 to 0.994. The replacement of MgO by ZnO further increased to 6.4mol%, the value of BO/T decreased to 3.04 instead, and thus the chemical durability deteriorated. The WLR of HF-acid and NaOH-alkali corrosion increased to 6.683 and 1.994, respectively. The chemical durability shows strongly dependent on the network connectivity and exhibits mixed intermediate effects during the replacement of MgO by ZnO.

Keywords

HF-acid corrosion / NaOH-resistance / network connectivity / Zn/Mg effect

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