Abstract
New superelastic superhard carbon materials are obtained from C60 fullerites hydrogenated in the solid state in a hydrogen atmosphere to a content of 0.4 wt % H (formula ~C60H3.5). Raman spectroscopy, light and electron microscopy, dynamic indentation, and tribological tests are used to study composite materials (CM) synthesized from mixtures of powders of Co and 10-wt % fullerites C60 or C60H3.5 under a pressure of 8 GPa at a temperature of 800°C. Hydrogenation of the initial fullerites increases the degree of amorphization of the structure of the high-pressure graphite-like phase, while its hardness increases by more than 2.5 times, up to ~52 GPa, and the elastic modulus during indentation increases by about 3 times, up to 333 GPa. The hydrogenation of C60 fullerites is a promising method for improving the tribotechnical characteristics of the superelastic hard phase formed during the thermobaric treatment of fullerites, as well as CMs reinforced with particles of such a phase: the CM friction coefficient decreases from 0.25 to 0.01 with a significant increase in wear resistance.
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The work was carried out within the framework of the State Task 075-00328-21-00.
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Chernogorova, O.P., Drozdova, E.I., Lukina, I.N. et al. Effect of Hydrogenation of C60 Fullerenes on the Properties of Their Transformation Products at High Pressures and Temperatures. Nanotechnol Russia 17, 534–540 (2022). https://doi.org/10.1134/S2635167622040061
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DOI: https://doi.org/10.1134/S2635167622040061