Difference between revisions of "Physical Effects in Sliding and Connector Contacts"
From Electrical Contacts
(→6.4.5 Physical Effects in Sliding and Connector Contacts) |
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*'''Mechanical wear of sliding contacts''' | *'''Mechanical wear of sliding contacts''' | ||
| − | dV/dx = k x | + | {| class="twocolortable" style="text-align: left; font-size: 12px" |
| − | + | |- | |
| − | k Coefficient of frictional wear | + | |dV/dx = k x F<sub>K</sub> /3 H<sub>W</sub> |
| − | + | |dV/dx Wear volume in mm<sup>3</sup> per slide path length in mm | |
| − | (Brinell or Vickers units) | + | |k Coefficient of frictional wear |
| − | + | |H<sub>W</sub> Hardness of the softer material <br />(Brinell or Vickers units) | |
| − | Wear coefficient k during material transfer | + | |F<sub>K</sub> Contact force in cN |
| − | + | |'''Wear coefficient k during material transfer''' | |
| − | -4 Platinum – Platinum 400 x 10 | + | |Silver – Silver 120 x 10<sup>-4</sup> |
| − | -4 Silver – Platinum 1.3 x 10 | + | |Platinum – Platinum 400 x 10<sup>-4</sup> |
| − | Coefficient of fractional wear k during wear loss | + | |Silver – Platinum 1.3 x 10<sup>-4</sup> |
| − | + | |'''Coefficient of fractional wear k during wear loss''' | |
| − | -4 Gold – gold 9 x 10 | + | |Silver – silver 8 x 10<sup>-4</sup> |
| − | -4 Platinum – platinum 40 x 10- | + | |Gold – gold 9 x 10<sup>-4</sup> |
| − | + | |Platinum – platinum 40 x 10<sup>-4</sup> | |
| − | -4 Silver – platinum 5 x 10 | + | |Silver – gold 9 x 10<sup>-4</sup> |
| + | |Silver – platinum 5 x 10<sup>-4</sup> | ||
| + | |} | ||
| + | |||
| + | |||
Fig. 6.15: Coefficient of frictional wear for the wear loss of sliding contacts Silver/Silver | Fig. 6.15: Coefficient of frictional wear for the wear loss of sliding contacts Silver/Silver | ||
Revision as of 16:24, 1 April 2014
6.4.5 Physical Effects in Sliding and Connector Contacts
- Mechanical wear of sliding contacts
| dV/dx = k x FK /3 HW | dV/dx Wear volume in mm3 per slide path length in mm | k Coefficient of frictional wear | HW Hardness of the softer material (Brinell or Vickers units) |
FK Contact force in cN | Wear coefficient k during material transfer | Silver – Silver 120 x 10-4 | Platinum – Platinum 400 x 10-4 | Silver – Platinum 1.3 x 10-4 | Coefficient of fractional wear k during wear loss | Silver – silver 8 x 10-4 | Gold – gold 9 x 10-4 | Platinum – platinum 40 x 10-4 | Silver – gold 9 x 10-4 | Silver – platinum 5 x 10-4 |
Fig. 6.15: 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
Fig. 6.16: Contact resistance R as a function k of the contact force F for different surface k coating materials. Measured against a spherical gold probe; I = 10 mA, U < 20 mV
Fig. 6.17: Contact resistance R as a function k of the fretting wear cycles for different surface coating materials
Tab.6.4: Surface Coating Materials for Connectors
