An Effect of Co–W Barrier Sublayer on the Functional Characteristics of Au–Ru Contact Coatings

Gennady P. Gololobov, Dmitriy V. Suvorov, Sergey M. Karabanov, Evgeniy V. Slivkin, Alexander Tolstoguzov

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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.

Original languageEnglish
Article number161
Number of pages10
JournalCOATINGS
Volume12
Issue number2
DOIs
Publication statusPublished - Feb 2022

Keywords

  • Au–Ru coating
  • Co–W barrier sublayer
  • Electroplating
  • Reed switch
  • Switching cycle
  • Transient resistance

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