Difference between revisions of "Physical Effects in Sliding and Connector Contacts"
From Electrical Contacts
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| − | |dV/dx = k x F<sub>K</sub> /3 H<sub>W</sub> | + | |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 | |dV/dx Wear volume in mm<sup>3</sup> per slide path length in mm | ||
| + | |- | ||
|k Coefficient of frictional wear | |k Coefficient of frictional wear | ||
| + | |- | ||
|H<sub>W</sub> Hardness of the softer material <br />(Brinell or Vickers units) | |H<sub>W</sub> Hardness of the softer material <br />(Brinell or Vickers units) | ||
| + | |- | ||
|F<sub>K</sub> Contact force in cN | |F<sub>K</sub> Contact force in cN | ||
| + | |- | ||
|'''Wear coefficient k during material transfer''' | |'''Wear coefficient k during material transfer''' | ||
| + | |- | ||
|Silver – Silver 120 x 10<sup>-4</sup> | |Silver – Silver 120 x 10<sup>-4</sup> | ||
| + | |- | ||
|Platinum – Platinum 400 x 10<sup>-4</sup> | |Platinum – Platinum 400 x 10<sup>-4</sup> | ||
| + | |- | ||
|Silver – Platinum 1.3 x 10<sup>-4</sup> | |Silver – Platinum 1.3 x 10<sup>-4</sup> | ||
| + | |- | ||
|'''Coefficient of fractional wear k during wear loss''' | |'''Coefficient of fractional wear k during wear loss''' | ||
| + | |- | ||
|Silver – silver 8 x 10<sup>-4</sup> | |Silver – silver 8 x 10<sup>-4</sup> | ||
| + | |- | ||
|Gold – gold 9 x 10<sup>-4</sup> | |Gold – gold 9 x 10<sup>-4</sup> | ||
| + | |- | ||
|Platinum – platinum 40 x 10<sup>-4</sup> | |Platinum – platinum 40 x 10<sup>-4</sup> | ||
| + | |- | ||
|Silver – gold 9 x 10<sup>-4</sup> | |Silver – gold 9 x 10<sup>-4</sup> | ||
| + | |- | ||
|Silver – platinum 5 x 10<sup>-4</sup> | |Silver – platinum 5 x 10<sup>-4</sup> | ||
|} | |} | ||
Revision as of 15:26, 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
