Development of magnesium‐aluminum‐silicate glass‐ceramics nucleated with Nb2O5. (11th October 2019)

• Record Type: Journal Article
• Authors: Benitez, Tobias; Veber, Alexander; Pagnan Furlan, Kaline; Barros Rebouças, Lara; de Ligny, Dominique; Hotza, Dachamir; Novaes de Oliveira, Antonio Pedro; Travitzky, Nahum
• Is Part Of: International journal of applied glass science. Volume 11:Number 1(2020)
• Page Start: 155
• Page End: 169
• Publication Date: 2019-10-11
• Subjects: armor -- crystallization -- impact resistance -- transparent glass‐ceramics; Glass -- Periodicals; Glass manufacture -- Periodicals; 666.1
• DOI: 10.1111/ijag.13874
• Languages: English
• ISSNs: 2041-1286

Abstract

Abstract: 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. Nb2 O5, MoO3 and TiO2 +ZrO2 were added as nucleating agents at the same molar proportion (1.0%). MAS glass‐ceramics nucleated with Nb2 O5 are strike face candidates for security windows when relevant outputs are taken into account, such as transparency, crack resistance, hardness and feasibility. Nb2 O5 ‐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.