Interfacial structure and strength of Si₃N₄ ceramics joint brazed with amorphous filler metal and Cu layer

Si₃N₄ ceramics was brazed with TiZrCuB amorphous filler metal and Cu interlayer, the effect of brazing metal composition and thickness of copper foil on interfacial structure and bonding strength were studied in this paper.The result shows that the joint strength is up to 241 MPa when the brazing temperature is 1 323 K, holding time is 30min, the thickness of Cu interlayer is 70 m and the exerted pressure is 0.027 MPa.the reaction layer is TiN, the interface microstructure is compounds of Si₃N₄/TiN/Ti-Si+Ti-Zr+Cu-Zr+α-Cu;changing the thickness of interlayer can adjust the thickness and composition of the reaction layer;As the thickness of Cu interlayer increases, Ti-Si compound layer has gradually separated from the TiN layer, and it is pushed to the weld center and refined to a granula shape.