Abstract
According to the magnesia-alumina phase diagram, the alumina-rich spinel may undergo exsolution of corundum during firing when incorporated into the castable. This research aimed to explore the phenomenon of alumina-rich spinel exsolution and its subsequent impact on the distribution of CaO·6Al2O3 inside the spinel and the strength of the castables when subjected to a firing temperature of 1600 °C. The results indicated that the amount of exsolved corundum escalated as the alumina content within the spinel rose after heat treatment, and this exsolved corundum was predominantly found within the original spinel particle. The CaO·2Al2O3, which formed when calcium aluminate cement was heated above 1200 °C, reacted preferentially with the exsolved corundum rather than with pre-added α-Al2O3 leading to the formation of CaO·6Al2O3 inside the spinel after firing at temperatures exceeding 1400 °C. This reaction formed an interpenetrated "spinel-CaO·6Al2O3" structure during firing, which enhanced the strength of the castables.
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