Maji , Adarsha and Sinhamahapatra , S. and Dana, Kaushik (2025) Effect of Sintering Atmosphere on the Densification Kinetics of Calcined Magnesia. In: Research Advancements and Industrial Challenges in Glass and Ceramics (RACGC 2025) , 27-29 November 2025, IIT Bombay . (Submitted)

Full text not available from this repository. (Request a copy)

Abstract

Sintering kinetics of brucite-derived calcined magnesia synthesized from kimberlite tailings was studied. The non-isothermal sintering kinetics of the calcined MgO at two different sintering atmospheres was studied using dilatometric data obtained under controlled heating conditions with a Thermo-Mechanical Analyzer. Model free analysis like iso-conversional methods viz. Ozawa–Flynn–Wall and Friedman provided a basic understanding of activation energy (Ea) at different conversion points of the sintering reaction. The air atmosphere sintering reaction (CM-Air) comprised (Ea) in the range of 500–630 kJ·mol-1 up to 80% densification and beyond that Ea increased steadily above approximately 1000 kJ·mol-1, suggesting a shift in the dominant sintering mechanism. The activation energy values were even higher (Ea= 800-1000 kJ·mol-1) during nitrogen atmosphere sintering (CM-N2) up to 80% densification than air atmosphere and increased sharply above 95% conversion. Model based analysis viz. linear and non-linear regression analysis revealed that both the atmospheres sintering followed a single-step, n-dimensional Avrami–Erofeev model whereas the Ea and logA values were significantly higher in N2 atmosphere sintering (Ea= 962.05 kJ.mol-1 and logA= 31.16 s-1) than air atmosphere sintering (Ea= 649.35 kJ.mol-1 and logA=19.79 s-1) with high coefficient of regression values. XRD analysis confirmed the presence of periclase as the major phase in all the reactions while energy-dispersive X-ray spectroscopy detected trace amounts of calcium silicate at the grain boundaries.

Item Type:	Conference or Workshop Item (Poster)
Subjects:	Refractories
Divisions:	Refractory
Depositing User:	Ms Upasana Sahu
Date Deposited:	12 May 2026 16:51
Last Modified:	12 May 2026 16:51
URI:	https://cgcri.csircentral.net/id/eprint/5788

Actions (login required)

View Item