Fretting in copper-to-copper contacts under AC and DC current conditions

• Published in: IEEE transactions on components and packaging technologies Vol. 24; no. 3; pp. 378 - 383
• Main Authors: Gagnon, D., Braunovic, M.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2001; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alternating current; Conducting materials; Contact resistance; Copper; Damage; Degradation; Direct current; Distortion; Electrical resistance measurement; Frequency; Fretting; Scanning electron microscopy; Sheet materials; Surface resistance; Voltage; Wire
• ISSN: 1521-3331; 1557-9972
• DOI: 10.1109/6144.946483

The effect of fretting on the contact resistance behavior of copper-to-copper wire-plate combinations under AC and DC current carrying conditions was investigated. The fretting conditions were as follows: frequency 1 Hz, slip amplitude 100 /spl mu/m and load 400 g (4N). The current level in both AC and DC conditions was 50 mA. In addition to contact resistance measurements, SEM and EDX were used to examine the surface damage in the fretted contact zones. The results indicate that the overall contact resistance behavior of copper-to-copper wire-plate couples subjected to the same fretting conditions but under AC and DC currents was practically the same. The characteristic feature of the samples under AC current conditions is a pronounced distortion of the waveforms of the contact voltage. The results of SEM surface analysis of the contact zones indicates that the surface damage resulting from fretting under AC current conditions was different from that under DC current conditions.