Electrical Erosion of the Contact Coatings Based on the High-Melting Point Metal Alloys

Abstract

The paper presents results of studying contact groups of the experimental electromagnetic relay with coatings based on the alloys with tungsten and molybdenum, which were obtained by electrochemical deposition. Alteration patterns in the contact electrical resistance were established and analyzed depending on the switching cycles’ number in the resistance load switching mode with 1 A current, 12 V voltage and 10 Hz frequency. The paper shows that introducing contact coatings based on the Ni--W, Co--W and Ni--Mo alloys makes it possible to stabilize spread in the contact electrical resistance values over the test interval main section. It was experimentally established that application of contact coating based on the tungsten alloys significantly increased switching life of the silver contact group from 2.3 • 10⁶ to 4.5 • 10⁶ switchings, while average value of the contact electrical resistance in steady state increased from 0.08 to 0.15 Ohm. A study was conducted to find the micro-relief alterations in the contact groups’ surface state with and without coating during the switching tests. Main mechanisms determining the electrical erosion processes intensity and switching life of the contact groups with types of the contact materials under study were considered

This work was carried out using facilities of the Regional Center for Probe Microscopy Shared Service Center at Ryazan State Radio Engineering University named after V.F. Utkin

Please cite this article in English as:

Gololobov G.P., Kruglov S.A., Suvorov D.V., et al. Electrical erosion of the contact coatings based on the high-melting point metal alloys. Herald of the Bauman Moscow State Technical University, Series Instrument Engineering, 2024, no. 1 (146), pp. 19--37 (in Russ.). EDN: AWMNSM

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