Diffusion Bonding Technology of a Titanium Alloy to a Stainless Steel Web With an Ni Interlayer

The probability and appropriate processing parameters for diffusion bonding of a titanium alloy to a stainless steel web with an Ni interlayer have been investigated. The microstructure of the diffusion bonding joint has been observed by microscopy, SEM, and EPMA, and the main factors affecting diffusion bonding have been analyzed. The results show that atom diffusion and migration between Ti and Fe or C are effectively prevented by adding pure Ni as the interlayer metal, and a firm joint is obtained. When products were diffusion bonded, the relationship of exerting pressure and deformation is analyzed. A method of controlling deformation and attaining nondeformation bonding has been proposed. The optimum parameters are as follows: bond temperature is 850°C, bond-specific stress is 10MPa bond time is 10–15 min, and difference between ring-shaped bonding area radii D-d is 1–1.5mm.