Slaking Resistance of CaO Ceramics Sintered from Al₂O₃-Coated CaCO₃ Powder

Abstract

CaCO₃ powder with high purity was coated with a chelate compound of aluminum corresponded to 0.5mass% Al₂O₃. The CIPed compact of the coated powder was sintered at 1500°C for 2h in air to prepare CaO ceramics (“COAT” specimen). The distribution of Al in the CaO matrix for the COAT was different from that for the CaO ceramics (“MIX” specimen) prepared from the mixture of CaCO₃ and Al₂O₃ powder. The sinterability and slaking resistance of the CaO ceramics were greatly improved by addition of 0.5mass% Al₂O₃. The relative density and slaking resistance of the COAT specimen were higher than those of the MIX specimen.