Diffusion bonding of TiB₂ cermet to TiAl intermetallic

The diffusion bonding of TiB₂ cermet to TiAl intermetallic was studied in this paper.The effects of bonding parameters on the microstructure of the joints and mechanical properties was investigated.The results showed that a Ti (Cu,Al)₂ intermetallic layer was formed at the interface between TiB₂ cermet and TiAl intermetallic when directly diffusion bonding.A TiAlNi₂ intermetallic layer and two Ti,Al,Ni solid solution layers were formed at the interface by using Ni interlayer.The shear strength was 103 MPa when directly diffusion bonding with bonding temperature T=1 223 K,bonding time t=1.8 ks and bonding pressure p=80 MPa,and the shear strength was 110 MPa by using Ni layer with T=1 223 K,t=1.8 ks and p=80 MPa.