Alkali-free aluminosilicate glass has several advantages,including a low thermal expansion coefficient and density,high elastic modulus,and excellent chemical and thermal stability,making it an ideal substrate materia...Alkali-free aluminosilicate glass has several advantages,including a low thermal expansion coefficient and density,high elastic modulus,and excellent chemical and thermal stability,making it an ideal substrate material for TFT-LCD and OLED applications.Understanding the relationship between the composition-microstructure-properties of this glass is crucial for designing materials with optimal properties and suitable process parameters.In this work,we investigated how the composition affects the microstructure and properties of alkali-free aluminosilicate substrate glass.We elucidated the relationship between composition-microstructure-properties through experiments and molecular dynamics simulations.As B_(2)O_(3) replaced Al_(2)O_(3) in the glass,the content of[AlO_(4)]in the network structure decreased,while the amounts of[BO_(3)]and[BO_(4)]increased.The triangular structure of[BO_(3)]expanded the network,reduced its connectivity,and loosened the overall structure.Consequently,the glass melt's viscosity,viscous activation energy,and melting temperature decreased.This study provided essential data and a theoretical foundation for industrial production based on the composition-microstructure-properties relationship.展开更多
基金the Anhui Provincial Key Research and Development Plan(Grant No.2023z04020014,202304a05020019)the Fundamental Research Funds for the Central Universities of China(Grant No.PA2023GDSK0056).
文摘Alkali-free aluminosilicate glass has several advantages,including a low thermal expansion coefficient and density,high elastic modulus,and excellent chemical and thermal stability,making it an ideal substrate material for TFT-LCD and OLED applications.Understanding the relationship between the composition-microstructure-properties of this glass is crucial for designing materials with optimal properties and suitable process parameters.In this work,we investigated how the composition affects the microstructure and properties of alkali-free aluminosilicate substrate glass.We elucidated the relationship between composition-microstructure-properties through experiments and molecular dynamics simulations.As B_(2)O_(3) replaced Al_(2)O_(3) in the glass,the content of[AlO_(4)]in the network structure decreased,while the amounts of[BO_(3)]and[BO_(4)]increased.The triangular structure of[BO_(3)]expanded the network,reduced its connectivity,and loosened the overall structure.Consequently,the glass melt's viscosity,viscous activation energy,and melting temperature decreased.This study provided essential data and a theoretical foundation for industrial production based on the composition-microstructure-properties relationship.
