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