STRUCTURE AND PROPERTIES OF THE SYSTEM COATING (Ag–C)/SUBSTRATE (Cu), IRRADIATED BY A PULSED ELECTRON BEAM

The resulting Ag–C system formed on a copper substrate is characterized by a highly developed coating thickness from 50 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. The change in the concentration ofcopper atoms with a change in the distance from the coating surface 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 offoils 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 was 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. The obtained set of properties and characteristics of the structure allows us to draw a conclusion about the suitability of the formed coatings for work in electrical contacts of powerful electrical networks. The specific choice of a certain model of contacts requires additional clarifying studies.

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