Development of magnesium‐aluminum‐silicate glass‐ceramics nucleated with Nb 2 O 5

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. Nb 2 O 5 , MoO 3 and TiO 2 +ZrO 2 were added as nucleating agents at the same molar proportion (1.0%)....

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Bibliographic Details
Published in:International journal of applied glass science 2020-01, Vol.11 (1), p.155-169
Main Authors: Benitez, Tobias, Veber, Alexander, Pagnan Furlan, Kaline, Barros Rebouças, Lara, de Ligny, Dominique, Hotza, Dachamir, Novaes de Oliveira, Antonio Pedro, Travitzky, Nahum
Format: Article
Language:English
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Summary: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. Nb 2 O 5 , MoO 3 and TiO 2 +ZrO 2 were added as nucleating agents at the same molar proportion (1.0%). MAS glass‐ceramics nucleated with Nb 2 O 5 are strike face candidates for security windows when relevant outputs are taken into account, such as transparency, crack resistance, hardness and feasibility. Nb 2 O 5 ‐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.
ISSN:2041-1286
2041-1294
DOI:10.1111/ijag.13874