Abstract: Sealing glass is widely used in vacuum microelectronics,aerospace,automobile and other industrial fields due to its good heat resistance,high chemical stability and mechanical strength.Phosphate glass has the characteristics of low cost,low characteristic temperature and low stability,which is often used to prepare sealing glass.The glass with composition of (60-x)SnF₂-xSnO-35P₂O₅-5WO₃ (x=0%,5%,10%,15%,20%,mass fraction) was prepared by high temperature melting method.The effect of SnO content on the structure and performance of the glass was studied.The internal structure of the glass was characterized by IR,and the thermal expansion coefficient and characteristic temperatures of the glass were measured.The results show that the addition of SnO to the composition introduces non-bridging oxygen to change the O/P atomic ratio,thereby affecting the glass structure and performance.With the increase of SnO content,the characteristic temperature,sealing temperature and water resistance of the glass are improved,and the coefficient of thermal expansion decreases.

Key words: low temperature sealing glass, phosphate, structure, characteristic temperature, coefficient of thermal expansion, water resistance