STRUCTURE AND PROPERTIES OF THE SYSTEM "COATING (Ag–C)/(COPPER) SUBSTRATE", IRRADIATED BY A PULSE ELECTRON BEAM
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DOI:
https://doi.org/10.25712/ASTU.2072-8921.2023.04.022Keywords:
low-energy pulsed electron beam, silver, carbon fiber, copper, nanosized particles, hardness, Young's modulus, wear resistanceAbstract
The resulting Ag-C system formed on a copper substrate is characterized by a highly developed coating thickness from 50 µm to 550 µm. In the coating, carbon-graphite fiber is present in the form of plates. The coating is an aggregate doped with copper atoms. Change the concentration of copper atoms when changing the distance from the surface of the coating to the depth has a positive gradient. The formation of interstitial solid solutions based on copper and silver is confirmed by X-ray phase analysis data. Studies by X-ray microanalysis of foils for transmission electron microscopy showed that copper in the coating is located in the form of thin layers along the boundaries of silver grains, or forms inclusions (grains) of submicrocrystalline sizes. It has been established that graphite is present in the form of nanosized (10-15 nm) particles in the volume of silver grains and copper grains, and is also located at the boundaries of silver grains. In the Ag–C/Cu system, the formation of a transition layer with a thickness of 250–300 nm was revealed. The size of subgrains in the transition layer varies within 150–250 nm. It is shown that the hardness and Young's modulus decrease with distance from the surface to the interface between the coating and the substrate. It has been established that the coating wear parameter is 6·10-6 mm3/N·m, which is 12.2 times less than the copper wear parameter. The resulting set of properties and characteristics of the structure allows us to conclude that the coatings formed are suitable for working in electrical contacts of powerful electrical networks. The specific choice of a specific model of contacts requires additional clarifying studies
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