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Diffusion bonding
From Wikipedia, the free encyclopedia
Diffusion bonding or diffusion welding is a solid-state welding technique used in metalworking, capable of joining similar and dissimilar metals. It operates on the principle of solid-state diffusion, wherein the atoms of two solid, metallic surfaces intersperse themselves over time. This is typically accomplished at an elevated temperature, approximately 50-75% of the absolute melting temperature of the materials.[1][2] A weak bond can also be achieved at room temperature.[3] Diffusion bonding is usually implemented by applying high pressure, in conjunction with necessarily high temperature, to the materials to be welded; the technique is most commonly used to weld "sandwiches" of alternating layers of thin metal foil, and metal wires or filaments.[4] Currently, the diffusion bonding method is widely used in the joining of high-strength and refractory metals within the aerospace[1] and nuclear industries.[citation needed]
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