Changes

===<!--6.4.5 -->Physical Effects in Sliding and Connector Contacts===

{| <table class="twocolortable" style="text-align: left; font-size: 12px;width:40%">|-<tr>|<td>dV/dx = k x F_K /3 H_W</td>|-</tr><tr> |<td>dV/dx Wear volume in mm³ per slide path length in mm</td>|-</tr><tr>|<td>k Coefficient of frictional wear</td>|-</tr><tr>|<td>H_W Hardness of the softer material <br />(Brinell or Vickers units)</td>|-</tr><tr>|<td>F_K Contact force in cN</td>|-</tr><tr>|<td>'''Wear coefficient k during material transfer'''</td>|-</tr><tr>|<td>Silver – Silver 120 x 10^-4</td>|-</tr><tr>|<td>Platinum – Platinum 400 x 10^-4</td>|-</tr><tr>|<td>Silver – Platinum 1.3 x 10^-4</td>|-</tr><tr>|<td>'''Coefficient of fractional wear k during wear loss'''</td>|-</tr><tr>|<td>Silver – silver 8 x 10^-4</td>|-</tr><tr>|<td>Gold – gold 9 x 10^-4</td>|-</tr><tr>|<td>Platinum – platinum 40 x 10^-4</td>|-</tr><tr>|<td>Silver – gold 9 x 10^-4</td>|-</tr><tr>|<td>Silver – platinum 5 x 10^-4</td>|}</tr></table>

<xr id="fig:fig6.16Contact resistance Rk as a function of the contact force Fk"/> <!--Fig. 6.16: --> Contact resistance R_k as a function of the contact force F_k for different surface coating materials. Measured against a spherical gold probe; I = 10 mA, U < 20 mV

<xr id="fig:fig6.17Contact resistance Rk as a function of the fretting wear cycles"/> <!--Fig. 6.17: --> Contact resistance R_k as a function of the fretting wear cycles for different surface coating materials

<figure id="fig:fig6.16Contact resistance Rk as a function of the contact force Fk">

<figure id="fig:fig6.17Contact resistance Rk as a function of the fretting wear cycles">

<figtable id="tab:Surface Coating Materials for Connectors"><caption>'''<!--Tab.6.4: -->Surface Coating Materials for Connectors'''</caption>

<div id="text-reference">(1)is formed during hot tinning process</div></figtable> <div class="clear"></div>