Microstructures and properties of (65-x)SiO2-xBi2O3-10B2O3-25CuO glasses

•The glass forming ability of the sample becomes strongest when the content of Bi2O3 reaches to 20mol% in the SBBC glasses.•The average melting point of the SBBC system glass is 648.2°C, which is 30% lower than the melting point of the traditional low-melting glass.•The bonding between the SBBC glasses and the alumina ceramic substrate belongs to the diffusion bonding, and the interface is connected by chemical bond. The influence of Bi2O3 content on the structure and properties of SBBC glass has been studied. The (65-x)SiO2-xBi2O3-B2O3-CuO (SBBC) glasses were prepared by high temperature melt cooling method. As-prepared glasses were studied using X-ray diffraction (XRD), differential thermal analysis (DTA), thermal expansion coefficient analyzer (CTE), scanning electron microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Infrared spectrometer (IR) and Raman spectrometer (Raman). The results show that when the contents of Bi2O3 increase from 15 mol% to 25 mol%, then Bi3+ destroys the structures of the glasses network. As a result, the glasses network became loose, also the transition temperature, softening point, and melting point of the glasses decrease. On the other hand, the thermal expansion coefficient of the glasses increase. The bonding mode of the glass-ceramic interface sintered at 650 °C belongs to diffusion bonding, and there is no defect on the bonding surface.