Abstract
The present study concerns the influence of calcium on the thermal oxidation of Ca-doped Co1-xO
and of CaO-coated cobalt. We have found that calcium enhanced the thermal oxidation of Co1-xO single crystals
while a CaO coating leads to a decrease of the oxidation kinetic of cobalt polycrystals, at T<1200°C. From a
formal treatment, based on the thermodynamic of irreversible processes, we have shown that the increase of the
thermal oxidation of Ca-doped Co1-xO is due to the increase of the diffusion coefficient of cobalt in Ca-doped
samples, while the beneficial effect of a CaO coating on the cobalt oxidation is due to the shift of the Co/Co1-xO
phase boundary to higher PO2, leading to a decrease of the driving force of diffusion in the oxide scale.
References
- Halem, N., Halem, Z., Halem, O., Abrudeanu, M., & Petor-Ervas, G. (2025). Influence of calcium on the thermal oxidation of Ca-doped CoO and of CaO-coated cobalt. The Eurasia Proceedings of Science, Technology, Engineering and Mathematics (EPSTEM), 36, 11-20
Details
| Primary Language | English |
|---|---|
| Subjects | Chemical Engineering (Other) |
| Journal Section | Articles |
| Authors | |
| Early Pub Date | October 31, 2025 |
| Publication Date | October 31, 2025 |
| Submission Date | June 12, 2025 |
| Acceptance Date | July 16, 2025 |
| Published in Issue | Year 2025 Volume: 36 |
