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→Contact Profiles (Contact Weld Tapes)
=== Contact Profiles (Contact Weld Tapes)===
Contact profiles span a broad range of dimensions. Width and thickness are typicallybetween 0.8 – 8.0 mm and 0.2 – 3.0 mm resp. Special configurations, often definedas miniature-profiles or even micro–profiles can have awidth < 2.0 mm.
Miniature–profiles are mostly composed of a contact-bimetal material with the contactmaterial being a precious metal alloy or composite material clad, welded or coated byelectroplating or vacuum-deposition (sputtered) onto a weldable base material. Sincethese profiles are attached to carrier strip materials usually by segment– or seam–welding to the base materials, materials with good welding properties such as nickel,copper-nickel, copper-tin, as well as copper-nickel-zinc alloys are used. The bottomsurface of the profiles usually has formed weld rails or similar patterns to ensure asolid continuous metallurgical weld joint between the profile and the contact carrier.
Contact profiles in larger sizes are often used for switching devices in the low voltagetechnology. For these the contact layer mostly consists of arc erosion resistantmaterials such as silver–nickel, silver–metal oxides or the weld resistant silver–graphite. The brazable or weldable underside of the metal oxide or silver–graphitematerials is usually pure silver with also quite often a thin layer of a phosphorouscontaining brazing alloy applied to aid the welding process. *Typical configurations of multi-layer contact profiles bild
*Typical configurations of multi-layer contact profiles (<xr id="fig:Typical configurations of multi-layer contact profiles"/>)
<figure id="fig:Typical configurations of multi-layer contact profiles">
[[File:Typical configurations of multi-layer contact profiles.jpg|right|thumb|Typical configurations of multi-layer contact profiles]]
</figure>
*Contact materials <br />Au-Alloys, Pd-Alloys, Ag-Alloys, Ag/Ni (SINIDUR), Ag/CdO (DODURIT CdO), Ag/SnO<sub>2</sub> (SISTADOX), Ag/ZnO (DODURIT ZnO)<br />
*Quality criteria <br />Beause of the variety of configurations of contact profiles usually the quality issues are separately agreed upon between the manufacturer and the user.<br />
*Dimensions and tolerances(<xr id="fig:Contact Profiles Dimensions and tolerances"/>)<figure id="fig:Contact Profiles Dimensions and tolerances">
[[File:Contact Profiles Dimensions and tolerances.jpg|right|thumb|Contact Profiles Dimensions and tolerances]]
</figure>
The thickness of the Au top-layer, which is sputtered for example, is between 0.2 and 5 μm, depending on the requirements. Tolerance of thickness is about ± 10%.
