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.

Chemical Alumina Preparation by Using High Alumina Content Fly Ash

2017 ◽  
pp. 115-120 ◽  
Author(s):  
Guozhi Lv ◽  
Ting-an Zhang ◽  
Weiguang Zhang ◽  
Xiaofeng Zhu ◽  
Yan Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Alumina Content ◽  
High Alumina ◽  
High Alumina Content

ChemInform Abstract: Controlled Pore Size, High Alumina Content Silica-Aluminas

ChemInform ◽  
2010 ◽  
Vol 22 (17) ◽  
pp. no-no
Author(s):  
L. L. MURRELL ◽  
N. C. JUN. DISPENZIERE ◽  
K. S. KIM
Keyword(s):  
Pore Size ◽  
Alumina Content ◽  
High Alumina ◽  
High Alumina Content

Periclase ?spinel products from magnesite powder with high alumina content

Refractories ◽  
1966 ◽  
Vol 7 (1-2) ◽  
pp. 77-80
Author(s):  
V. A. Bron ◽  
M. I. Diesperova ◽  
I. F. Chikurov ◽  
N. F. Bugaev
Keyword(s):  
Alumina Content ◽  
High Alumina ◽  
Magnesite Powder ◽  
High Alumina Content

Network Structure of Oxide Glasses Containing Alkali & Other Ions by Diffraction and MD Simulations

1996 ◽  
Vol 455 ◽  
Author(s):  
Itaru Yasui ◽  
H. Nagasawa ◽  
H. Matsumoto ◽  
T. Mabuchi
Keyword(s):  
Network Structure ◽  
Tellurite Glass ◽  
Glass Structure ◽  
Diffraction Method ◽  
Md Simulations ◽  
Silicate Glasses ◽  
Oxide Glass ◽  
Oxide Glasses ◽  
Alkali Ions ◽  
Mixed Alkali

ABSTRACTNetwork structures of several kinds of oxide glasses were analyzed by means of neutron or x-ray diffraction method and molecular dynamics (MD) simulations including silicate, borate and tellurite glasses. The basic scheme of the structure highly depends on the bonding nature of network forming oxide, but the size of the alkali ions is another important factor to control the network structure of the glass. Structures of silicate glasses are rather easily reproduced by means of MD simulation, whereas borate or tellurite glass structures are hard to be constructed by MD calculation with only 2-body potentials. It is necessary to use adequate potentials to control the bonding angles of O-M-O or M-O-M. The network structure of tellurite glass seems very complex because of the shape of structural units with low symmetry, the use of a new kind of potential was found indispensable to reproduce the glass structure by MD.In addition to the network structure, the polarization of ions seems to be important to understand the whole vision of oxide glass structures. A new kind of MD was developed which took polarization of ions into account to understand the mixed alkali effects in silicate glasses.

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