Electro-mechanical properties and welding characteristics of Ag/MoS2, Ag/WS2, Ag/CNTs and Ag/CdO materials for high-DC current contact applications

Konferenz: ICEC 2014 - The 27th International Conference on Electrical Contacts
22.06.2014 - 26.06.2014 in Dresden, Deutschland

Tagungsband: ICEC 2014

Seiten: 6Sprache: EnglischTyp: PDF

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Autoren:
Jacimovic, Jacim (Departement de Physique de la Matiere Condensee, Universite de Geneve, quai E.-Ansermet 24, 1211 Geneva 4, Switzerland)
Felberbaum, Laurent (Secheron SA, Rue du Pre-Bouvier 25, 1217 Meyrin - Geneva, Switzerland)

Inhalt:
The optimisation of contact materials emerges as a cornerstone for reliable functionality of high-speed DC circuit breaker. Ag/CdO is widely used despite its RoHS non-conformity. To overcome this issue new materials are requested. We have prepared Ag/MoS2, Ag/WS2, Ag/Carbon-nanotubes composite materials and investigated their structural, mechanical, electrical and thermal properties. These materials have been used in switching operation tests on a laboratory-scale fully instrumented model of circuit breaker, under a maximum current load of 12 kA. Welding and sticking tendencies were examined. A relationship between the microscopic variables, the occurrence of welding events and their strengths was established.