FIELD: technological processes.
SUBSTANCE: invention relates to the technology of applying coatings on copper electrical contacts, which can be used in electrical engineering as electroerosion-resistant coatings with high electrical conductivity. Method of electroerosion-resistant coating application of system SnO2-In2O3-Ag-N on the surface of a copper electrical contact is carried out as follows. Electrical explosion of a composite electrically explosive conductor consisting of a two-layer flat silver shell with mass of 60–360 mg and a core in the form of tin dioxide SnO2 powders with weight equal to 0.5–2.0 of the weight of said shell, and indium oxide In2O3 with weight equal to 0.1–0.2 of the weight of said shell. Pulsed multiphase plasma jet is formed from explosion products. Surfaces of copper electric contact are fused with it at absorbed power density of 4.5–6.5 GW/m2. Explosion products are deposited on the surface of the copper electric contact and a composite coating of SnO2-In2O3-Ag system is formed on it. Nitriding is carried out for 3–5 hours at temperature of 500–600 °C and subsequent pulse-periodic electron-beam treatment of the surface of the obtained coating with absorbed energy with density of 40–60 J/cm2, pulse duration 150–200 mcs and number of pulses 10–30.
EFFECT: obtaining a composite coating of the system SnO2-In2O3-Ag-N, having high stability of the structure, high adhesion with a copper substrate, high degree of homogenization of the structure of the surface layer, mirror luster of the surface, high electrical conductivity and electric erosion resistance.
1 cl, 3 dwg, 2 ex
