STUDY OF CHARACTERISTICS OF GALLIUM-CONTAINING MATERIALS FOR SLIDING ELECTRICAL CONTACTS WITH INTERMEDIATE LIQUID METALLIC MEDIUM

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Authors

A.A. MITYUREV, Cand. Sc.

Abstract

A description is given of the designs of two installations for studying the electrical characteristics of liquid metals based on gallium and its eutectic alloys for liquid metal contacts (LMC) of electrical machines and apparatuses. The setups make it possible to determine the electrical resistivity of liquid metals, regardless of the design of liquid metal assemblies, without the formation of intermetallic compounds with gallium, in the temperature range according to GOST 8024-90 T = 30…180 °C. The linear nature of the temperature dependence of the electrical resistivity ρ = f(T) of gallium-containing materials for LMC has been experimentally confirmed. For this temperature dependence, the values of the coefficient ρ30 of the specific electrical resistance of LM at a temperature 30 °C and the temperature coefficient α of the electrical resistance of gallium and its eutectic alloys are determined: GI (77,5 % Ga / 22,5 % In); GIS (62 % Ga / 25 % In / 13 % Sn); GISZ (64 % Ga / 12 % In / 13 % Sn / 11 % Zn) used in modern high-ampere electric devices, including composite LMCs.

Keywords

sliding electrical contact, liquid metal contact, boundary friction, wear, gallium, eutectic alloy, electrical resistivity, temperature dependence