关键词: SiO2-Al2O3-MgO玻璃;玻璃结构;玻璃性能;Al/Si比

Abstract: SiO2-Al2O3-MgO glass is used to prepare high modulus glass fiber for its high strength and high modulus of elasticity. The SiO2-Al2O3-MgO based glasses with different Al/Si ratios were prepared by melt cooling method,and the structure and properties of the glass were studied. Infrared spectral analysis showes that the glass network structure is composed of [AlO4 ]and [SiO4 ]. With the increase of Al/Si ratio,the content of [AlO4 ]remaines unchanged,and the content of [AlO6 ]increases gradually. DSC analysis showes that the glass transition point Tg and nucleation temperature Tx increases with the increase of the Al/Si ratio,and the glass crystallization tendency becomes stronger. The thermal expansion analysis shows that the thermal expansion coefficient of glass increases firstly and then decreases with the increase of Al/Si ratio. The results of physical and mechanical properties are as follows:with the increase of Al/Si ratio,the density and elastic modulus increase as well,while the bending strength and the Vickers hardness decrease continuously.

Key words: SiO2-Al2O3-MgO glass;glass structure;glass property;Al/Si ratio