Research on diffusion bonding mechanism of Al2O3/Al2O3 joints

The diffusion bonding of alumina ceramics was carried out by the hot-pressing method. Under the suitable condition, the plastic deformation happened at the bonding interface, the contact area increased, and the diffusion bonding was completed with the pores at the bonding interface being eliminated or significantly reduced. The maximum bonding strength which is obtained at room temperature with the hot pressing parameters of 1420°C temperature, 15 MPa pressure and 60 min holding time is 357 MPa, which exceeds the average flexural strength of the original body. The average bonding strength obtained under these conditions is 250 MPa, which is 85% of the average flexural strength of the original body.