Diffusion bonding is a process where two surfaces are brought into contact, and under heat and pressure, the surfaces are bonded together. This process is most often associated with a superplastic forming operation where diffusion bonding is used to eliminate the need for fasteners in complex assemblies. Binary phase diagrams can often be used to differentiate which alloy systems will exhibit diffusion bonding. Iron carbide (Fe3C) can be used to form a metallurgical bond between two mating low carbon steels. At temperatures above 950°C, Cr2O3 begins to evaporate off the surface and the oxide is no longer protective against diffusion bonding. In such cases, alloys containing aluminum are required since aluminum forms a more protective oxide layer at these higher temperatures.
D. C. Van Aken, "Diffusion Bonding," Industrial Heating, BNP Media, Inc., Jan 1999.
Materials Science and Engineering
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