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===<!--6.4.5 -->Physical Effects in Sliding and Connector Contacts===
*'''Mechanical wear of sliding contacts'''
[[File:Coefficient of frictional wear for the wear loss of sliding contacts Silver Silver.jpg|right|thumb|Coefficient of frictional wear for the wear loss of sliding contacts Silver/Silver and hard gold/hard gold as a function of the contact force]]
*'''Contact behavior of connectors'''
<xr id="fig:Contact resistance Rk as a function of the contact force Fk"/><!--Fig. 6.16:--> Contact resistance R<sub>k</sub> as a function of the contact force F<sub>k</sub> for different surface coating materials. Measured against a spherical gold probe; I = 10 mA, U < 20 mV
<xr id="fig:Contact resistance Rk as a function of the fretting wear cycles"/><!--Fig. 6.17:--> Contact resistance R<sub>k</sub> as a function of the fretting wear cycles for different surface coating materials
<div class="multiple-images">
<figure id="fig:Contact resistance Rk as a function of the contact force Fk">
[[File:Contact resistance Rk as a function of the contact force Fk.jpg|right|thumb|Contact resistance R<sub>k</sub> as a function of the contact force F<sub>k</sub> for different surface coating materials. Measured against a spherical gold probe; I = 10 mA, U < 20 mV]]
<div class="multiple-images">
<figure id="fig:Contact resistance Rk as a function of the fretting wear cycles">
[[File:Contact resistance Rk as a function of the fretting wear cycles.jpg|right|thumb|Contact resistance R<sub>k</sub> as a function of the fretting wear cycles for different surface coating materials]]
<figtable id="tab:Surface Coating Materials for Connectors"><caption>'''<!--Tab.6.4: -->Surface Coating Materials for Connectors'''</caption>
{| class="twocolortable" style="text-align: left; font-size: 12px"
|Electroplating
|Tin<br />Nickel<br />Nickel-phosphorus (NiP 6 - 15)<br />Silver<br />Hard gold (< 0.3 wt% Ni or Co)<br />Palladium with Au- flash (<0,2μm)<br />Palladium-nickel with Au-flash (<0.2μm)
|For brass: Copper or Nickel<br /> <br /> <br /> <br />Nickel, Nickel-phosphorus<br />Nickel<br />Nickel
|50 - 90<br />300 - 600<br />500 - 1100<br />70 - 100<br />100 - 200<br />250 - 300<br />300 - 400
|0.5 - 1<br /> <br /> <br />0.5 - 0.8<br />0.2 - 0.5<br />0.2 - 0.5<br />0.2 - 0.5
|-
|Cladding
|Gold-nickel (AuNi 5 -10)<br />Silber-palladium (AgPd 10 - 30)
|Nickel<br />Nickel
|160 - 200<br />120 - 170
|0.2 - 0.5<br />0.2 - 0.5
|-
|Hot-dipped tinning
|Tin
|Inter-metallic compound[[#text-reference|<sup>(1)</sup>]] Tin–copper
|400 - 500
|
|}
<div id="text-reference">(1) is formed during hot tinning process</div>
</figtable>
<div class="clear"></div>
==References==
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]]
[[de:Physikalische_Effekte_bei_Gleit-_und_Steckkontakten]]
