Abstract
Multi-interlayer of Ti/Cu/Ti was used to join TiC-Al₂O₃ composite ceramics with W18Cr4V tool steel. Bonding was performed at 1130 °C for 1 h with a pressure of 15 MPa. The TiC-Al₂O₃/W18Cr4V diffusion bonded joint was examined by means of optical microscope, scanning electron microscope (SEM) and electron probe microanalysis (EPMA). The results indicated that the interfacial transition region was not uniform in thickness. Due to the difference of atom diffusion rate in each substrate, solid-liquid interface migrates at different rates. There were no brittle phases with high hardness in the interfacial transition region. The fracture of a TiC-Al₂O₃/W18Cr4V joint demonstrated a brittle cleavage feature. The interfacial shear strength reached about 141 MPa.

Key words
TiC-Al₂O₃/W18Cr4V joint, diffusion bonding, microstructure, fracture

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