Chornovol V. Structure and corrosion resistance of Cu-Mo, Cu-W composite materials, obtained by electron-beam evaporation-condensation method

Subject of research: composite materials Cu-Mo, Cu-W, obtained by electron-beam evaporation-condensation; purpose - solution of scientific and technical task on development of new composite materials Cu-Mo, Cu-W, obtained by electron-beam evaporation-condensation, studying of peculiarities of their structure and physicochemical properties for the needs of electrical industry; methods - review and analysis of literature, experimental studying, analysis and implementation of research results into production; results - experimental-industrial testing of composite materials as electrical contacts showed the positive effect of using of Cu-Mo composite materials as interrupting contacts of weakly and moderately loaded switching devices with optimal molybdenum content up to 7-8% and Cu-W composite materials as vacuum contacts for blowout chambers with optimal wolfram content up to 52-54%; novelty - in interval of molybdenum and wolfram concentrations up to 50% the peculiarities of the structure and physicochemical properties of composite materials Cu-W, Cu-Mo were determined; it was showed for the first time that at increasing of wolfram content in composite materials Cu-W the corrosion resistance was increased and at increasing of molybdenum content in composite materials Cu-Mo the corrosion resistance was decreased; the influence of molybdenum and wolfram concentrations on the rate of corrosion processes was determined for the first time; the influence of refractory components on resistance to high temperature oxidation was studied; it is showed that at increasing of refractory component content the yield and strength limits were increased and ductility parameters were decreased. Testing and implementation of composite materials Cu-Mo were performed in cooperation with "Eltehmash" (Kyiv, Ukraine), the I.M. Frantsevych Institute of Materials of NAS of Ukraine (Kyiv, Ukraine), the Kyiv National University of Construction and Architecture (Ukraine) and the Wroclaw University of Technology (Poland). Compositions of new composite materials, based on copper and molybdenum, were developed for sliding contacts of switching devices of the vehicles, used for transportation of copper ore. The experimental-industrial testing of new composite materials Cu-W as contacts in vacuum chambers of MBK 400 type (production of the Institute of Tele- and Radio Engineering in Warsaw, Poland), which is a constructive part for interrupters of low voltage for 1000 V, 400 A, 50 Hz, used mainly in coal mines, was performed with positive result.