Maji, Adarsha and Dana, Kausik and Sinhamahapatra, Somnath (2025) Investigation of Densification Pathway of Magnesia Refractory through Non-Isothermal Kinetics. In: 29th International Conference on Non-Ferrous Metals-2025 (ICNFM-2025), 11-12 July 2025, Hotel Taj Bengal, Kolkata.
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Abstract: Brucite-derived calcined magnesia, which was synthesized from kimberlite tailings was studied for its sintering kinetics. The non-isothermal sintering kinetics of the calcined MgO were studied using dilatometric data obtained under controlled heating conditions with a Thermo-Mechanical Analyzer. Both model-free and model-based analyses were conducted to investigate the sintering behaviour. Iso-conversional methods such as Ozawa–Flynn–Wall (OFW) and Friedman approaches indicated an apparent activation energy (Ea) in the range of 500–630 kJ·mol⁻¹ up to 80% conversion. Beyond this point, Ea increased significantly to approximately 1000 kJ·mol⁻¹, suggesting a shift in the dominant sintering mechanism. Multiple linear regression analysis revealed that a single-step, n-dimensional Avrami–Erofeev model most accurately described the sintering pathway (Ea=686 kJ·mol⁻¹, n= 0.19 and log A= 21.09 s-1) with a high coefficient of regression (R² = 0.997315). Additionally, isothermal sintering was also performed in the temperature range of 1500 –1700 °C under static conditions. XRD analysis confirmed the exclusive presence of the periclase (MgO) phase post-sintering, while energy-dispersive X-ray spectroscopy (EDS) detected trace amounts of calcium at the grain boundaries. This study provides a comprehensive theoretical foundation and introduces a novel perspective for understanding the sintering behaviour of magnesia.
| Item Type: | Conference or Workshop Item (Poster) |
|---|---|
| Uncontrolled Keywords: | Magnesia; Sintering; Activation Energy; Kinetics |
| Subjects: | Refractories |
| Divisions: | Refractory |
| Depositing User: | Ms Upasana Sahu |
| Date Deposited: | 01 Sep 2025 10:32 |
| Last Modified: | 01 Sep 2025 10:32 |
| URI: | http://cgcri.csircentral.net/id/eprint/5775 |
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