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

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 glas...

Full description

Saved in:
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, Ligny, Dominique, Hotza, Dachamir, Novaes de Oliveira, Antonio Pedro, Travitzky, Nahum
Format: Article
Language:English
Subjects:
Aluminum
armor
Ceramics
Crack propagation
crystallization
Glass
impact resistance
Indentation
Knoop hardness
Magnesium
Molybdenum oxides
Molybdenum trioxide
Niobium oxides
Oxidizing agents
Precursors
Reducing atmospheres
Size effects
Titanium dioxide
transparent glass‐ceramics
Zirconium dioxide
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
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. 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.
ISSN:2041-1286
2041-1294
DOI:10.1111/ijag.13874