The influence of nucleating agents and heat-treatments on magnesium-aluminum-silicate (MAS) glass-ceramics was studied. MAS precursor glasses were melted in oxidant (air) and reducing atmospheres. Nb2O5, MoO3 and TiO2+ZrO2 were added as nucleating agents at the same molar proportion (1.0%). MAS glass-ceramics nucleated with Nb2O5 are strike face candidates for security windows when relevant outputs are taken into account, such as transparency, crack resistance, hardness and feasibility. Nb2O5-doped MAS can achieve up to 20% crystalline volume fraction, while keeping the visible transparency close to 70%. Knoop hardness was raised up to 7.4 GPa in comparison to precursor glass (6.2 GPa), considering the indentation size effect. The crack resistance reached 4 N.
ASJC Scopus subject areas
- Materials Science(all)