Abstract
The performance characteristics (microhardness, porosity, roughness, and transient resistance) of Au–Ru coatings with and without the Co–W alloy barrier sublayer electrodeposited on the surface of contact blades of commercially produced reed switches were investigated. It was found that the barrier sublayer reduces the average roughness of the coatings without significant change in their porosity. The Au–Ru coatings without sublayer exhibited a greater variation in the transient resistance during an increase in the pressing force. The service time of reed switches with the barrier sublayer increased in both testing modes: in low-power (50 mV, 5 μA, 50 Hz) by more than 4 × 106 switching cycles, and in mean-power (12 V, 0.25 A, 50 Hz) by more than 1.8 × 106 switching cycles.
Highlights
The mechanical contact of two electrical conductors underlies the operation of various electric devices such as magnetically operated contacts, electromechanical relays, different circuit changers including RF commutators, etc
We studied two groups of the contact blades prepared at Ryazan Metal Ceramics Instrumentation Plant Joint Stock Company (RMCIP JSC) (Ryazan, Russia)) with Au–Ru coatings electrochemically deposited on Fe–Ni permalloy substrate (Ni, 52 wt %)
We studied the surface morphology of each layer of Au–Ru coatings with and without the Co–W sublayer and initial surface texture of the blades after electrochemical polishing
Summary
The mechanical contact of two electrical conductors underlies the operation of various electric devices such as magnetically operated contacts (reed switches), electromechanical relays, different circuit changers including RF commutators, etc. A spring-loaded contact is an important part of any electrical connectors. The main requirements for the above devices are the low transient (contact) resistance, operational reliability and longterm service time of the switched contacts [1]. To meet these requirements, various contact coatings are employed. Such coatings should be erosion and corrosion resistant, possess high wear resistance, have good adhesion with a substrate material, good friction ability and microhardness. To efficiently counteract the erosion process, the contact materials should have high melting and sublimation points. Multilayer alloy-based coatings meet these requirements to a considerable degree [2,3]
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