2,808
edits
Changes
→6.3 Design Technologies for Contacts
!Remarks
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|Contacts for dry circuitsContact rivets solid, inserted wire segments|Reliable contacting at very low currents and voltages and mostly at also<br Ag, Ag alloys, Au alloys, Pd alloys, Ag/Ni, Ag/C97/3, Ag/>low contact forcesMeO (1.2 – 8 mm Ø)|AuAg alloysAll types of switches in the communications, automotive, or power distribution technology simple contact component, (AuPt)universally applied, Auselection through economic aspects|Contact rivets, welded miniature profiles Secure rivet attachment only with sufficiently thick shank (tapesshank Ø = 1⁄2 head Ø), electroplated Au, sputtered Au layers; change-over contacts by forming secondary head from longer shanks
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|Switching contacts in measuring devicesContact rivets, clad (Composite Rivets)|Reliable switching at low voltages and currents at low contact forces|Au and Pt Ag, Ag alloys, Ag/Ni, Ag/MeO on Cu base (AgPd alloys2 ~ 10 mm Ø)|Contact rivetsAll types of switches in the communications, welded tipsautomotive, clad partsor power engineering|Secure rivet attachment only with sufficiently thick shank (shank Ø = 1⁄2 head Ø)
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|Keyboard contactsContact rivets with brazed surface layer|Defined contacting, close Tungsten and difficult to bounce-free make, high reliability at low switching loads|Au alloys, form powder metallurgical materials (AgPdi.e. Ag/C), Au on Ni substrateCu or Fe bases (1 ~ 12 mm Ø)|Au plated snap discsSwitches for power engineering, Au clad wires and stamped parts, hard gold electroplated W layers mostly for controls|Tungsten contact spots on printed circuit boardsto be staked (riveted) with moderate force or using orbital riveting; for Fe bases also warm-forming
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|Rotary switches on printed circuit boardsContact screws|Good frictional wear resistance, low Any contact résistance|Sliding track: hard gold material on Ni substrate Slider: AgPd alloyFe and CuZn screws, brazed, (Hard silver1 ~ 10 mm Ø, M 2 ~ M 10)|Electroplated coatings on slide tracks; clad, welded, or riveted stamping partsAdjustable contacts for controls and horns|During brazing carrier may get soft
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|Slip rings with high reliability
