Abstract
In this study, nano CaCO3 was added to CAC to prepare mono-carbonate hydrate (C4AcH11). The mechanical properties, pore structure, and fracture behavior at high temperatures of mono-carbonate bonded alumina-spinel castables were assessed. The results showed that the plate-like mono-carbonate promotes early setting behaviors and higher demolding strength. The sintering effects of nano CaCO3 compensate for the strength decay at intermediate temperatures. Moreover, well-distributed CaO sources are essential to forming smaller and elongated CA6 interlocking laminar structures and contribute to the refinement of pore structures (<10 µm) after firing at 1600 °C. The fracture behavior of CAC-bonded alumina-spinel castables evaluated at 1400 °C shows that the deformation of fine grains/matrices and pores leads to typical nonbrittle fracture.
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