Difference between revisions of "Physical Effects in Sliding and Connector Contacts"
From Electrical Contacts
(→6.4.5 Physical Effects in Sliding and Connector Contacts) |
(→6.4.5 Physical Effects in Sliding and Connector Contacts) |
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'''Tab.6.4: Surface Coating Materials for Connectors''' | '''Tab.6.4: Surface Coating Materials for Connectors''' | ||
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| + | {| class="twocolortable" style="text-align: left; font-size: 12px" | ||
| + | |- | ||
| + | !Manufacturing method | ||
| + | !Coating materials | ||
| + | !Intermediate layer | ||
| + | !Hardness HV | ||
| + | !Frictional factor | ||
| + | |- | ||
| + | |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 | ||
| + | |} | ||
==References== | ==References== | ||
[[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]] | [[Application Tables and Guideline Data for Use of Electrical Contact Design#References|References]] | ||
Revision as of 16:14, 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
| Manufacturing method | Coating materials | Intermediate layer | Hardness HV | Frictional factor |
|---|---|---|---|---|
| Electroplating | Tin Nickel Nickel-phosphorus (NiP 6 - 15) Silver Hard gold (< 0.3 wt% Ni or Co) Palladium with Au- flash (<0,2μm) Palladium-nickel with Au-flash (<0.2μm) | |||
| For brass: Copper or Nickel Nickel, Nickel-phosphorus Nickel Nickel |
50 - 90 300 - 600 500 - 1100 70 - 100 100 - 200 250 - 300 300 - 400 |
0.5 - 1 0.5 - 0.8 0.2 - 0.5 0.2 - 0.5 0.2 - 0.5 |
