Growth of massive cementite layers; thermodynamic parameters and kinetics
Source abstract
Abstract
Massive, pure cementite layers were grown on ferrite substrates by nitrocarburising in a dedicated NH3/H2/CO/N2 containing gas atmosphere at temperatures in the range of 783-843 K. From the parabolic layer-growth constants, an "apparent" activation energy for cementite-layer growth of 109 ± 12 kJ/mol was obtained. This "apparent" activation energy can be subdivided into a positive contribution due to the activation energy for (tracer) diffusion of carbon in cementite and a negative contribution due to the temperature dependence of the difference of the carbon activity in cementite at the surface and at the interface cementite/ferrite.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Concrete and Cement Materials Research · Magnesium Oxide Properties and Applications · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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