Vacuum brazing of K9 glass to 2507 stainless steel

K9 glass was successfully brazed to 2507 stainless steel by using SnA gC u-x% Ti composite filler with different Ti contents. The effects of Ti content on the microstructure and mechanical properties of the joints were investigated. The microstructures of the brazed joints were investigated with scanning electron microscope（ SEM）,energy dispersive spectrometer（ EDS） and optical digital microscope（ OM）. The mechanical properties of the joints were measured with universal material testing machine,and the fracture interface were analyzed. The results show that the typical interfacial microstructures are 2507 stainless steel/FeSn₂/FeS n/Sn（ s,s）/Ti-Sn/K9 glass. With the increase of Ti content,more Ti-Sn compounds form in the joints and the shear strength of the joints increases. The shear strength of the joints reaches a maximum of 7. 3 MPa at the temperature of 675 ℃ and the holding time of 10 min. Shear test indicated that the fracture of the brazed joints does through the K9 glass and extends into the filler close to K9 glass interface.