The effect of substitution of Al₂O₃ and B₂O₃ for SiO₂ on the properties of cover glass for liquid crystal display: Structure, thermal, visco‐elastic, and physical properties

Abstract

By the substitution of Al 2 O 3 and B 2 O 3 for SiO 2 of the glass network former, the structural and thermal, visco-elastic and physical properties of aluminosilicate glass were investigated. 27 Al NMR results showed that in the glass structure of the system, Al 3+ basically existed in the form of 4-coordinated [AlO 4 ] tetrahedron as the network former. Judged by Raman spectra, the bridging vibration Si-O b increased with the Al 2 O 3 /SiO 2 substitute. And the total non-bridging vibration Si-O nb decreased, indicating the enhancement of the structure compactness. While for B 2 O 3 /SiO 2 substitute, the vibration at around 1010 cm −1 and the bridging vibration Si-O b in Q 4 unit both decreased and the structure got loosened. Based on the study of the structure of glass, the thermal, viscoelastic, and physical properties such as viscosity, coefficient of the linear thermal expansion, high-temperature resistance, strain point, annealing point, and softening point, aswell as density and elastic modulus were investigated. The evaluation of the melting and fining process was also investigated by high-temperature observation test. Furthermore, the chemical strengthening properties of glass samples were also investigated. The introduction of B 2 O 3 benefited for the ion-exchange. In this study, the glass composition of sample 4 was suitable for the floating process under comprehensive consideration.

Analysis of the Dielectric Properties of Alkali-Free Aluminoborosilicate Glasses by Considering the Contributions of Electronic and Ionic Polarizabilities in the GHz Frequency Range

“…Aluminoborosilicate glasses are attractive materials for composite structure applications, including PCBs, owing to their low dielectric property, low coefficient of thermal expansion, high thermal stability, high mechanical stability, etc. [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. Recently, alkali-free aluminoborosilicate glass compositions incorporating rare earth (RE) species have attracted considerable attention for the development of low-dielectric glass fibers because of their promising ability to improve the viscosity and dielectric properties [ 30 , 31 , 32 ].…”

Molecular dynamics simulations of magnesium aluminosilicate glass structure: High‐coordinated alumina and oxygen tricluster formation

“…The MAS system was chosen for its importance in industrial applications such as liquid crystal displays, and nuclear waste storage, and its prevalence in geological processes within the Earth's mantle. 4,11,[20][21][22][23] Specifically, MAS glasses have demonstrated desirable properties such as an increase in thermal and chemical stability, higher strain tolerance, and lower density when compared to other alkaline earth aluminosilicate compositions. 24,25 The structure of MAS glasses is unique compared to commonly studied sodium or calcium aluminosilicates.…”

“…Three more recently developed potentials popular within the glass MD community with unique interatomic forms, were analyzed for the MgO‐Al 2 O 3 ‐SiO 2 (MAS) system. The MAS system was chosen for its importance in industrial applications such as liquid crystal displays, and nuclear waste storage, and its prevalence in geological processes within the Earth's mantle 4,11,20–23 . Specifically, MAS glasses have demonstrated desirable properties such as an increase in thermal and chemical stability, higher strain tolerance, and lower density when compared to other alkaline earth aluminosilicate compositions 24,25 …”