Alkali-free aluminoborosilicate glass

Abstract

Provided is alkali-free aluminoborosilicate glass. The glass is prepared by the following raw materials in percentage by weight: 60-72% SiO2, 13-18% of Al2O3, 8.5-10% of B2O3, 1-4.5% of MgO, 3-8% of CaO, 1-5% of SrO, 0.5-2% of ZrO2, 1-5% of P2O5, and 0.1-0.5% of SnO2, wherein SiO2+Al2O3 is 76-85%; (MgO+CaO+SrO)/Al2O3 is 0.4-0.7; the total amount of alkaline earth metal oxide is 5-11.5%; B2O3/(B2O3+ZrO2+P2O5) is 0.6-0.9; and (ZrO2+P2O5)/(MgO+CaO+SrO) is 0.15-0.8. The glass has the characteristics such as higher strain point, high Young modulus, high hardness, high specific modulus, proper thermal expansion coefficient, and low thermal shrinkage; the boron volatilization rate is as low as 5.6-10.5%, so that the phenomenon of component nonuniformity due to boron volatilization can be effectively controlled; and the glass is suitable for a float forming process, does not contain toxic substances such as As2O3 and Sb2O3, is environment-friendly, is suitable for large-scale industrial production, and is particularly suitable for glass substrates for LCD/OLED displays.

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