METHOD FOR APPLYING ELECTRIC-EROSION-RESISTANT COATINGS BASED ON SILVER, NICKEL AND NICKEL NITRIDES TO COPPER ELECTRICAL CONTACTS

摘要

FIELD: electrical engineering.;SUBSTANCE: invention relates to the formation of coatings on copper electrical contacts, it can be used in electrical engineering. The method for applying electrical-erosion-resistant coatings based on silver and nickel containing nickel nitrides to copper electrical contacts includes an electric explosion of a two-layer composite electrically exploding conductor, one of the layers of which consists of a silver foil weighing 60-360 mg, and the second layer consists of a nickel foil equal to 0.5-2.0 of the mass of the first layer, the formation of a pulsed multiphase plasma jet from the explosion products, melting of the surface of the copper electrical contact with it at an absorbed power density of 4.5-6.5 GW/m2, deposition of the explosion products on the surface and the formation of a Ni-Ag system coating on it, nitriding for 3-5 hours at a temperature of 500-600°C and subsequent pulse-periodic electron beam treatment of the coating surface at an absorbed energy density of 40-60 J/cm2, pulse duration of 150-200 mcs and the number of pulses of 10-30. ;EFFECT: formation of a surface layer with increased electrical conductivity and electrical-erosion resistance, which increases the service life and expands the scope of practical application of electrical contacts in electrical equipment.;1 cl, 3 dwg, 2 ex