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Development of magnesium‐aluminum‐silicate glass‐ceramics nucleated with Nb 2 O 5
Author(s) -
Benitez Tobias,
Veber Alexander,
Pagnan Furlan Kaline,
Barros Rebouças Lara,
Ligny Dominique,
Hotza Dachamir,
Novaes de Oliveira Antonio Pedro,
Travitzky Nahum
Publication year - 2020
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.13874
Subject(s) - materials science , ceramic , silicate , indentation , knoop hardness test , aluminium , magnesium , composite material , mineralogy , metallurgy , indentation hardness , chemical engineering , microstructure , chemistry , engineering
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.