Bi_2O_3-B_2O_3-SiO_2玻璃钎料连接Li-Ti铁氧体接头的电磁性能分析

Electromagnetic property of Li-Ti ferrite joints bonded by Bi_2O_3-B_2O_3-SiO_2 glass brazing material

将Bi_2O_3-B_2O_3-SiO_2玻璃钎料用于连接Li-Ti铁氧体,分别采用X射线衍射分析仪和扫描电子显微镜表征连接件相组成和界面形貌,同时表征其磁性能和介电性能,研究连接过程对其电磁性能的影响.结果表明,Bi_2O_3-B_2O_3-SiO_2玻璃钎料连接Li-Ti铁氧体的效果较好,连接界面无孔洞、裂纹等缺陷.随着连接温度升高,焊缝宽度减小,焊缝中开始出现白色Bi_5Ti_3FeO_(15)相且数量逐渐增多.较低的连接温度和玻璃焊缝及Bi5Ti3FeO15相的引入均不会影响连接件的磁性能.玻璃焊缝的引入同样不会影响连接件的介电常数,但会增加连接件的介电损耗.焊缝中的Bi_5Ti_3FeO15相会同时增加连接件的介电常数和介电损耗.

Bi_2O_3-B_2O_3-SiO_2 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 Bi_2O_3-B_2 O_3-SiO_2 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 Bi_5Ti_3FeO15 phases at the interface makes the dielectric constant and dielectric loss tangent increase simultaneously.