Effect of Al2O3 additions on the acid durability of a Li2O–ZnO–SiO2 glass and its glass-ceramic

The effect of Al2O3 substitution on the acid durability of a Li2O–ZnO–SiO2 glass and its glass-ceramic was investigated depending on the applied heat treatments, the type and concentrations of acid solutions, and leaching time. Satisfactory acid durability was obtained by using 6 wt.% Al2O3 for the glass and 11 wt.% for the glass-ceramic. The acid resistance of both glasses and glass-ceramics was found to be affected markedly by the presence of P2O5 or TiO2 used as nucleating agent.