Abstract
Pressure and pressureless electrical contacts were evaluated by measuring the contact electrical resistivity between copper mating surfaces. Pressure electrical contacts with a contact resistivity of 2×10−5 Ω·cm2 have been attained using a carbon black paste of a thickness of less than 25 μm as the interface material. In contrast, a pressureless contact with silver paint as the interface material exhibits a higher resistivity of 3×10−5 Ω·cm2 or above. A pressureless contact with colloidal graphite as the interface material exhibits the same high contact resistivity (1×10−4 Ω·cm2) as a pressure contact without any interface material. On the other hand, pressureless contacts involving solder and silver epoxy exhibit lower contact resistivity than carbon black pressure contacts.
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Leong, CK., Chung, D.D.L. Pressure electrical contact improved by carbon black paste. J. Electron. Mater. 33, 203–206 (2004). https://doi.org/10.1007/s11664-004-0180-0
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DOI: https://doi.org/10.1007/s11664-004-0180-0