Effect of Al2O3 and B2O3 on the Structure and Thermal Properties of Aluminum Borosilicate Glasses
The SiO2-Al2O3-B2O3 system glass was prepared by high-temperature melting method.The effect of glass structure on the thermal properties of glass was studied by changing the Al2O3∶B2O3 ratio in glass composition.The structure of glass samples was studied through nuclear magnetic resonance spectroscopy.The results show that in the aluminum borosilicate glass system,as the Al2O3∶B2O3 ratio in the glass increases,the thermal expansion coefficient of the glass decreases,and the glass transition temperature and glass softening temperature increase.This performance change is related to the microstructure of the glass.As the Al2O3∶B2O3 ratio in the glass increases,the free oxygen in the structure will preferentially combine with Al3+to form more[AlO4]entering the glass network,while forming a small amount of[AlO5]and[AlO6]structures.The remaining less free oxygen will combine with B3+to form[BO4]and[BO3]structures,which affect the thermal properties of the glass.
NETL
NSTL
万方数据
