Open AccessEffect of synthesis parameters on the structure and properties of carbon particles formed from amorphous fullerites
Author(s) -
I. N. Lukina,
O. P. Chernogorova,
E. I. Drozdova,
Evgeny A. Ekimov,
M. O. Apostolova,
Denis Prokopenko,
А. В. Солдатов,
Vicente Benavides
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/848/1/012050
Subject(s) - materials science , high resolution transmission electron microscopy , amorphous carbon , raman spectroscopy , amorphous solid , tribology , indentation , composite material , carbon fibers , transmission electron microscopy , fullerene , composite number , nanotechnology , crystallography , organic chemistry , chemistry , physics , optics
The effect of high-pressure synthesis temperature on the structure and indentation characteristics of the superelastic hard carbon formed from amorphous fullerites and on the tribological properties of the Co-based composite materials (CM) reinforced by the particles of such carbon has been studied by Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), indentation measurements, and tribological tests. It is shown that ball milling (for 48 h) of C 60 fullerite crystals results in the amorphization of the product of fullerite transformation upon their high-pressure treatment at temperatures above the stability limit of fullerene molecule (∼800°C). An increase in synthesis temperature at 8 GPa from 800°C to 1200°C leads to a gradual graphitization of the structure of amorphous fullerite derived carbon. This decreases its hardness and indentation modulus from 32 to 18 GPa and from 256 to 95 GPa, respectively, and increases the elastic recovery (from 80% to 86%). The best tribological characteristics of the CM are attained at the maximum particle hardness, which is realized in the CM synthesized at 800°C. When the synthesis temperature is elevated to 1200°C, the friction coefficient and wear rate of the CM increase, but they remain substantially lower than those of the matrix cobalt.