Effect of SrO content on microstructure of Bi2O3-B2O3-ZnO-BaO-SrO low-melting glass frit and joining performance of sodalime glass substrates

We studied the feasibility of using Bi-based lead-free glass paste as bonding material on soda-lime glass substrates, without any activation preparation on the bonding surfaces. In order to fabricate Bi 2 O 3 -B 2 O 3 -ZnO-BaO-SrO system low-melting glass frit, quenching is performed using deionized water after melting using a muffle furnace. Glass paste consisting of glass frit mixed with organic solvent is deposited on the surface of the soda-lime glass substrate by screen printing, and the sealing of the glass substrate is finally achieved at the bonding temperature (500 °C). we discuss the properties of glass powder, the joint microstructure of irregular amorphous glass, the shear properties and the glass frit bonding mechanism based on the characterization results of DSC , XRD , FTIR, Raman, XPS , SEM and TEM. Furthermore, the investigation concentrated on mechanical properties and microstructural characterization of the joined area with two silica substrates. As the SrO content increased from 0 to 3 mol%, T g increased from 396 °C to 418 °C with increasing SrO content. Accompanied by an increase in SrO content from 1 mol% to 2 mol%, the room-temperature shear strength of the glass specimens increased from 28.5 to 45 MPa. The growth of Bi 24 B 2 O 39 crystallites precipitated at the interface was studied.