Effect of contact capacitance on current-voltage characteristics of stationary metal contacts

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dc.contributor.author Dervos Constantine, T en
dc.contributor.author Michaelides Joseph, M en
dc.date.accessioned 2014-03-01T02:41:30Z
dc.date.available 2014-03-01T02:41:30Z
dc.date.issued 1997 en
dc.identifier.issn 03614395 en
dc.identifier.uri http://hdl.handle.net/123456789/30498
dc.subject Charge Injection en
dc.subject Charge Transport en
dc.subject Contact Area en
dc.subject Contact Resistance en
dc.subject Current Density en
dc.subject current-voltage characteristic en
dc.subject Energy Storage en
dc.subject Equivalent Circuit en
dc.subject Phase Shift en
dc.subject Series Resistance en
dc.subject.other Capacitance en
dc.subject.other Charge transfer en
dc.subject.other Current density en
dc.subject.other Current voltage characteristics en
dc.subject.other Electric impedance en
dc.subject.other Equivalent circuits en
dc.subject.other Interfaces (materials) en
dc.subject.other Interfacial energy en
dc.subject.other Silver en
dc.subject.other Thermal effects en
dc.subject.other Apparent contact areas en
dc.subject.other Effective contact areas en
dc.subject.other Electric contacts en
dc.title Effect of contact capacitance on current-voltage characteristics of stationary metal contacts en
heal.type conferenceItem en
heal.identifier.primary 10.1109/HOLM.1997.638007 en
heal.identifier.secondary http://dx.doi.org/10.1109/HOLM.1997.638007 en
heal.publicationDate 1997 en
heal.abstract This paper investigates experimentally the significance of the effective contact capacitance, i.e. the interfacial capacitance during the current flow, for a wide range of stationary metal contacts operating under high charge injection rates. The effective capacitance of metallic interfaces depends on the ratio between the apparent contact area (which is optically determined) and the effective contact area (which injects the electronic charges). Silver contacts having series resistance values significantly less than the contact resistance were subjected to a.c. high current densities (up to 500 A/mm2). The obtained i(t) and v(t) profiles were further analyzed to obtain I-V curves. Due to the phase shift between i(t) & v(t) profiles the I-V curve within a single period of the stimulating current will produce a closed loop. The area of the loop determines the interfacial electrical energy. According to the obtained results the electrical energy storage at a given metal contact, increases at: a) higher ampacity values, b) lower operating temperatures and c) higher clamping forces between the joints (elastic deformation regime) each of the above parameters acting independently. The experimental results were obtained for AgSnO2 and OFHC contacts operated in a wide temperature range, varying between -130 °C and +40 °C. The observed response of the electrical contacts is mainly characterized by the implications of the asperity contact model and dominating charge transport processes across the metallic interfaces. When standard simple equivalent circuits are used to determine contact impedance, the effective capacitance of current carrying metal contacts acquires exceptionally high values. en
heal.publisher IEEE, Piscataway, NJ, United States en
heal.journalName Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts en
dc.identifier.doi 10.1109/HOLM.1997.638007 en
dc.identifier.spage 152 en
dc.identifier.epage 164 en

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