Abstract
CaO ceramics were prepared by conventional sintering process and their hydration behaviors were evaluated by measuring weight increment on saturated water vapor pressure at ambient temperature. CaCO₃ and limestone were used as CaO source materials and Al₂O₃, MgO and SiO₂ were added as sintering agents. Al₂O₃ was a liquid phase sintering agent to increase densification and grain growth rates, whereas MgO and SiO₂, densification and grain growth inhibitors. Regardless of composition, all of the prepared CaO ceramics showed the improved hydration resistance as bulk density increased. Especially, when bulk density was more than 3.0 g/㎤, there was no weight increment after 120 h hydration. Therefore, to decrease contact area between CaO and water vapor by increasing bulk density with the Al₂O₃ sintering additive was effective for the improvement of CaO hydration resistance.
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