Sintering may be defined as a thermal process that induces diffusion bonds. The sintering process bonds together tangent metal surfaces at their points of contact without the addition of any filler metal or bonding agent. A suitable environment of high temperature and isostatic pressure causes this bonding to occur via a combination of various mechanisms, including surface and volume molecular diffusion, evaporation and recondensation, grain growth and recrystallization, deformation and plastic flow.
In a proper sintering process, these mechanisms work together to produce a securely fused joint at each metal-to-metal contact point. Such a process may be used to sinter together metal powders, fibers, wires, and fine screens to create a wide variety of materials, as well as laminating such materials to coarser support structures such as perforated plate, solid or photo-etched metal foils, expanded metal, or heavy structural wire meshes. This article will focus primarily on the class of structures produced by sintering multiple layers of woven wire mesh together to create an integrally bonded laminate.
An important point is that in almost all cases, the solidus (melting point) of the alloy is not exceeded during sintering, and no incipient melting is permitted. So, for example, in Federal Specification(Filters, Wire Cloth Type, Space Shuttle Program), the definition of sintering as “a process whereby woven wire is partially melted to cause bonding…” is simply incorrect.
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What is sintering?
2014-12-30
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