Abstract

The reaction of titanium with carbon has been investigated over the temperature range of 870–1020°C. The layer growth of titanium carbide was found to be parabolic with time. The temperature dependence of the parabolic rate constants for the layer growth can be expressed as(Remark: Graphics omitted.)for the titanium specimen containing 0.06 wt% oxygen. The temperature dependence of the diffusion coefficients of carbon in TiC can be expressed as(Remark: Graphics omitted.)for the titanium specimen containing 0.06 wt% oxygen. A small amount of oxygen (0.06–0.47 wt%) retarded the diffusion rate of carbon in TiC . The discrepancy between the chemical diffusivities and the self-diffusivities of carbon in TiC could not be explained only in terms of dlnaTi⁄dlnNTi.

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