Development of magnesium-aluminum-silicate glass-ceramics nucleated with Nb₂O₅

Journal
International journal of applied glass science  
Volume
11
Issue
1
Start Page
155
End Page
169
Citation
International Journal of Applied Glass Science 1 (11): 155-169 (2020-01-01)
Publisher DOI
10.1111/ijag.13874
Scopus ID
2-s2.0-85074010506
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.
Subjects
armor
crystallization
impact resistance
transparent glass-ceramics