Star alkoxysilane molecules, gels and appreciably tough glasses

2005 ◽  
Vol 15 (35-36) ◽  
pp. 3812 ◽  
Author(s):  
Kenneth G. Sharp
Keyword(s):  
Tough Glasses

scholarly journals Towards Ultra-Tough Oxide Glasses with Heterogeneities by Consolidation of Nanoparticles

2020 ◽  
Author(s):  
Yanming Zhang ◽  
Liping Huang ◽  
Yunfeng Shi
Keyword(s):  
Cold Work ◽  
Silicate Glasses ◽  
Alumina Content ◽  
Oxide Glass ◽  
High Alumina ◽  
Oxide Glasses ◽  
Flow Strength ◽  
High Alumina Content ◽  
Dynamics Simulations ◽  
Tough Glasses

We prepared heterogeneous alumina-silicate glasses by consolidating nanoparticles using molecular dynamics simulations. Consolidated glasses from either low alumina content alumina-silicate glasses or high alumina content alumina-silicate glasses show significantly improved ductility around consolidation pressure of ~3 GPa. The introduced structural heterogeneities, namely over-coordinated network formers and their neighboring oxygen atoms, are identified as plasticity carriers due to their high rearrangement propensity. In addition, consolidated oxide glass from both 23.4Al2O376.6SiO2 and 73.1Al2O326.9SiO2 nanoparticles show improved flow strength (up to 1 GPa) due to the introduction of chemical heterogeneities. Last but not least, apparent hardening behavior appears upon cold work in consolidated glasses, with an increase of yield strength from ~3.3 GPa to ~6.4 GPa. This method is a big advancement toward ultra-strong and ultra-tough glasses by breaking the structure, composition and size limitations in traditional melt-quench process.

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