The effects of various finished surfaces on diffusion bonding

Using a theoretical model for diffusion bonding, which contains the real information of the intended bonding surfaces and considers the effect of the limited diffusion distance in a definite time, effects of various finished surfaces on diffusion bonding were investigated. The simulation results indicate that, under the same bonding condition with the exception of the surface finish method, the bonding couples with surfaces prepared by the turning technique exhibit a higher bonding rate than the couples with as-ground surfaces and show a slower bonding rate than the couples with the intended bonding surfaces ground by fine-SiC abrasive paper. Contributions from each operating mechanism to the interfacial void closure vary with bonding time, surface roughness and the surface finish method of the intended bonding surfaces.