Abstract
Diffusion bonding of TiC-Al₂O₃ composite ceramics to Q235 low carbon steel using Ti/Cu/Ti as multi-interlayer has been carried out by liquid diffusion welding technology. The microstructure and phase constituents for TiC-Al₂O₃/Q235 diffusion bonded joint were studied via scanning electron microscope and X-ray diffraction. The results indicate that various new phases are formed near the interface of TiC-Al₂O₃/Q235 joint and these are TiO, Ti₃Al, Cu₂Ti₄O, and Cu₃Ti₃O. The joints were produced with average shear strength of more than 100 MPa. The maximum joint strength was obtained reaching a value of 143 MPa. The fracture reveals brittle cleavage features. The fracture initiated in TiC-Al₂O₃ near the interface and propagated further towards to the interface.

Key words
TiC-Al₂O₃/Q235 joint, diffusion bonding, microstructure, phase constituents

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