Characterization of internally oxidized Cu-C composite
Anžel, Ivan, inženir metalurgije in materialov ; Rudolf, Rebeka ; Kneissl, Albert C.
The internal oxidation of Cu-C composite with fine dispersed graphite particles results in the submicron-size bubbles homogeneously distributed in the Cu matrix. The process starts with dissolution ...of oxygen into the metal at the free surfaces and continues with diffusion of oxygen atoms into the volume of the copper crystal lattice where they react with the graphite particles. The reaction of dissolved oxygen with carbon yields the gas products (CO, CO2), which cannot be dissolved in the crystal lattice of the matrix. The gas molecules, which are enclosed in the space previously occupied by the graphite, have a greater specific volume than the solid graphite. Consequently, the compressive stresses arise in the copper matrix around the bubbles. The interaction of these stress fields with gliding dislocations during loading could improve the mechanical properties of the copper. The internal oxidation kinetic in Cu-C composite depends on the diffusion of oxygen in the copper matrix and the penetration depth of the internal oxidation front indicates the parabolic nature of the process. The activation energy was found to be about 70 kJ/mol what is close to the activation energy for the volume diffusion of oxygen in copper.
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