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 be en investigated. The microstructure of the diffusion bonding joint has been observed by microscopy, SEM, and EPMA, and the main factors affecting diff usion bonding have been analyzed. The results show that atom diffusion and migration between Ti and Fe or C are effectively prevented by adding pure N i 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 tem perature is 850 degrees 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. (C) Elsevier Science Inc., 1999. All rights reserved.