Physical Effects in Sliding and Connector Contacts

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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


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

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
Contact resistance Rk as a function of the contact force Fk for different surface coating materials. Measured against a spherical gold probe; I = 10 mA, U < 20 mV

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

References

References