Zongqi Guo, Ying Ma et Michel Rigaud
Article de revue (2020)
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Libre accès au plein texte de ce document Version officielle de l'éditeur Conditions d'utilisation: Creative Commons: Attribution (CC BY) Télécharger (1MB) |
Abstract
The purpose of this paper is to present the results of an investigation aiming at obtaining high quality sintered magnesia from two well-known Chinese magnesite. Two types of natural magnesite have been considered, one macrocrystalline, from Liaoning, with the grain size of 60-100 μm and one cryptocrystalline, from Tibet, with 2-4 μm grains. Calcining characteristics to transform the two magnesite to caustic magnesia have been studied at first. Subsequently, the calcining-sintering characteristics using a two- and a three-step process for both raw materials at different temperatures have been determined. A DTA–TGA study reveals that the minimum endothermic peak during the calcining step differs by 28°C (624 vs 652°C between the crypto- and macrocrystalline magnesite). It has also been observed that by using a two-step sintering process, it is possible to obtain a magnesia with a bulk density of 3.26 and 3.14 g/cm3, respectively, for cryptocrystalline and macrocrystalline, while with a three-step process, it is possible to reach a bulk density of 3.48 g/cm 3, even at a temperature <1750°C.
Mots clés
densification, hydration, magnesia, microstructure, sinter/sintering
Sujet(s): | 1400 Génie minier et minéral > 1400 Génie minier et minéral |
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Département: | Département de génie mécanique |
URL de PolyPublie: | https://publications.polymtl.ca/10637/ |
Titre de la revue: | International Journal of Ceramic Engineering & Science (vol. 2, no 6) |
Maison d'édition: | Wiley |
DOI: | 10.1002/ces2.10068 |
URL officielle: | https://doi.org/10.1002/ces2.10068 |
Date du dépôt: | 01 mars 2023 15:53 |
Dernière modification: | 11 avr. 2024 06:30 |
Citer en APA 7: | Guo, Z., Ma, Y., & Rigaud, M. (2020). Sinterability of macrocrystalline and cryptocrystalline magnesite to refractory magnesia. International Journal of Ceramic Engineering & Science, 2(6), 303-309. https://doi.org/10.1002/ces2.10068 |
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