Electromagnetic property of Li-Ti ferrite joints bonded by Bi₂O₃-B₂O₃-SiO₂ glass brazing material

Bi₂O₃-B₂O₃-SiO₂ glass brazing material is used to join Li-Ti ferrite. In order to investigate the influence of bonding process on the electronic and magnetic properties, XRD and SEM are applied to characterize the phase composition and microstructure of Li-Ti ferrite joints and the magnetic and dielectric properties of joints are also measured. The results show that successfully bonding of Li-Ti ferrite with Bi₂O₃-B₂O₃-SiO₂ glass brazing material is obtained and nearly no holes or cracks are observed in the joints. When joining temperature rises, the weld width decreases. Meanwhile, Bi₅Ti₃FeO₁₅ phases begin to form and its quantity increases gradually. Low bonding temperature and introduction of glass interlayer and Bi₅Ti₃FeO₁₅ phases at the interface do not affect the magnetic performance. Introduction of glass interlayer does not affect the dielectric constant, but increases the dielectric loss tangent. The introduction of Bi₅Ti₃FeO₁₅ phases at the interface makes the dielectric constant and dielectric loss tangent increase simultaneously.