What Is Diffusion Bonding?
Diffusion Bonding is a solid state metal joining process where two metals (which may be dissimilar) are joined together by the application of heat and pressure. Diffusion involves the migration of atoms across the joint that diffuse to each other, resulting in very high joint efficiencies.
The Diffusion Bonding Process
During the Diffusion Bonding Process, the two materials are pressed together at an elevated temperature usually between 50% and 70% of the melting point. The pressure is used to relieve the void that may occur due to the different surface topographies.
The interface contact can be optimized by a treatment of the surface to be bonded through a number of processes such as mechanical machining and polishing, etching, cleaning and coating. Full intimate contact of the surfaces at the joint interface is required, therefore surface treatment, selecting of bonding temperature and loading are important factors of the diffusion bonding process.