Interface structure of brazing joint between hydrogenated TC4 titanium alloy and C/SiC composite

Hydrogenated TC4 titanium alloy with different hydrogen content and C/SiC composite was carried out with brazing AgCu filler foil. The interfacial microstructure of the joints was analyzed by SEM, EDS, XRD etc. At the same time, the influence of different brazing parameters was examined. The results show that: the typical interface microstructure of brazed joints of 0.3% hydrogenated braced at 840 °C for 10 min could be expressed as titanium alloys/ needle veidemann organization/Ti(s.s)+Ti₂Cu hypereutectoid organization/ Ti₂Cu+TiCu+Ti₃Cu₄ diffusion layer/Ag(s.s)+Cu(s.s)/ TiCu+Ti₅Si₃/TiC/Composite. The microstructure of the joints with different hydrogen content was basically the same, but the reaction layer became thicker as the hydrogen content increased. When the brazing temperature or holding time increased, the more and more Ti₅Si₃ compounds which closed to the composite was found, and the TiC reaction layer became continuous and thicker.