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 0.5 mass% Al2O3. The CIPed compact of the coated powder was sintered at 1500°C for 2 h 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 sinter-ability and slaking resistance of the CaO ceramics were greatly improved by addition of 0.5 mass% Al2O3. The relative density and slaking resistance of the COAT specimen were higher than those of the MIX specimen.