Effect of different P2O5/SnF2 ratios on the structure and properties of phosphate glass

Phosphate glass is usually used as a low-temperature sealing material due to its lower sealing temperature, lead-free, and environmentally friendly characteristics. In this experiment, xP2O5-(70-x) SnF2-15SnO-10WO3-5B2O3(x=40,35,30,25,20) glasses were prepared by traditional melting quenching method. The glass structure, properties and chemical stability were studied. According to the analysis of Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS), the reduction of P−O−P broken by fluorine led to the transformation of glass structural unit Q2 to Q1 and Q0 and the reduction of glass average chain length. Sn2+ ions participated in the network structure as glass formers, which increased the size of the glass network. Since the large number of short chain groups in the glass network, it had lower characteristic temperature and larger thermal expansion coefficient, but also showed better chemical stability, which made it have broad application prospects in the field of low temperature sealing.