Лазерное и электронно-лучевое упрочнение металлов с наноуглеродным покрытием

Abstract

The results of experiments on modifying metal surface by applying nanocarbon coating followed by laser or electron beam treatment are generalized. Soot produced as a result of electric arc sputtering of graphite electrodes followed by extraction of fullerenes, graphene oxide thermally reduced at different temperatures, and С60 fullerene were used as nanocarbon coating. An impulse laser with a wavelength of 1.064 μm, impulse energy at a level of 10 J, and impulse duration around a few milliseconds was used as a source of high-energy irradiation. An accelerator providing electron energy of 60 keV and a stationary beam current up to 250 mA was used as an electron beam source. The accomplished experiments point to a considerable (up to 8 times) increase in the microhardness of the treated steel surface which is accompanied by a decrease of the friction coefficient by several tens percent. It has also been found that the microhardness of the treated surface is a non-monotonic function on the laser or electron beam irradiation energy.