Mechanochemical synthesis of Co-C materials

Abstract

Using mechanochemical processing, we prepared nonequilibrium Co-C solid solutions supersaturated with carbon to above 7 at %. X-ray diffraction characterization showed that the formation of fcc Co1 − xCx solid solutions was accompanied by an increase in the probability of deformation stacking faults. In Co + C mixtures containing more than 10 at % carbon, the fcc solid solution converted to the metastable cobalt carbide Co3C with an orthorhombic structure. We assessed the thermal stability of the nonequilibrium Co1 − xCx solid solutions and the heat effect of the decomposition of the cobalt carbide Co3C: −ΔH = 23 kJ/mol.