2012
DOI: 10.1111/j.1551-2916.2012.05161.x
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Abstract: Calcium hexaluminate (CaO·6Al2O3–CA6) is usually associated as the product reaction between alumina and CA2 (CaO·2Al2O3) in cement‐bonded refractory castables. However, some investigations related to the Al2O3–CaO–MgO ternary system have indicated that CA6 could be generated by additional routes, involving two other high‐alumina phases: CaMg2Al16O27 (CM2A8) and Ca2Mg2Al28O46 (C2M2A14). Considering the lack of conclusive studies on this subject in the refractories field, the present study addresses an in‐depth … Show more

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Cited by 39 publications
(22 citation statements)
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“…Thermodynamically, the evolution of these two hydrates gives rise to the stable hydrate C 3 AH 6 , while the alumina gel crystallizes as gibbsite (γ‐AH 3 ). In the temperature range of 110–1000°C, the decrease in mechanical properties is due to destruction of the hydrate network or the cement and increase in the porosity of the paste; at 1000°C, CA reacts with alumina to form di‐aluminate of calcium (CA 2 ) in parallel with a volume expansion of the material . In the case of Al 2 O 3 –MgO–CaO system of the sample with the addition of MR66, alumina also reacts with magnesia to form in situ spinel associated with an additional thermal expansion.…”
Section: Resultsmentioning
confidence: 99%
“…Thermodynamically, the evolution of these two hydrates gives rise to the stable hydrate C 3 AH 6 , while the alumina gel crystallizes as gibbsite (γ‐AH 3 ). In the temperature range of 110–1000°C, the decrease in mechanical properties is due to destruction of the hydrate network or the cement and increase in the porosity of the paste; at 1000°C, CA reacts with alumina to form di‐aluminate of calcium (CA 2 ) in parallel with a volume expansion of the material . In the case of Al 2 O 3 –MgO–CaO system of the sample with the addition of MR66, alumina also reacts with magnesia to form in situ spinel associated with an additional thermal expansion.…”
Section: Resultsmentioning
confidence: 99%
“…Sodium oxide induced liquid phase formation. According to the previous analysis [20], the liquid phase was firstly generated at 1000 C by the reaction between b-Al 2 O 3 and microsilica. The phase diagram of CaOeNa 2 OeSiO 2 eAl 2 O 3 quaternary system (seen in Fig.…”
Section: Discussionmentioning
confidence: 99%
“…The composition of the castables matrix with SiO 2 was located inside the tetrahedron MgAl 2 O 4 eCaAl 12 O 19 eCaAl 2 Si 2 O 8 eCa 2 Al 2 SiO 7 given by V azquez et al [19]. The experiments demonstrated that the eutectic point in this system was 1350 ± 20 C and the equilibrium phases at 1500 C for the matrix composition were spinel-CA 6 -liquid [20]. The addition of TiO 2 made a greater impact on the phase evolution for castables.…”
Section: Phase Compositionmentioning
confidence: 96%
“…In addition, considering the excellent high‐temperature mechanical properties and chemical stability, these composites are promising high‐temperature structural materials, for which the high relative density is required. Although there have been many studies on the phases and microstructure evolution, thermodynamic behavior, and slag attack resistance of this system in the refractory field, no relevant studies regarding the improvement of its poor sintering and densification process have been reported in the literatures. Therefore, in order to solve this issue, ZrO 2 was introduced as an additive into this system in this research, considering its positive role in improving the sintering and toughness of the ceramic materials.…”
Section: Introductionmentioning
confidence: 99%