Effect of mixing procedures and compaction pressures on the powder reaction of CuO-η-Al2O3 and ZnO-η-Al2O3 systems

Article abstract of DOI:10.1007/BF02385400

The rate of reaction of the compacted powders of CuO-η-Al₂O₃ and ZnO-η-Al₂O₃ systems was measured in air at 800 to 900°C and the effect of the mixing procedure (dry and wet mixing) and compaction pressure (0 to 8.3 × 10⁸Pa) of reactant oxides on the fraction of reaction completed (α) was investigated. In the reaction of the CuO-η-Al₂O₃ system, the α-values obtained for the sample prepared by wet mixing in ethanol were higher than those for the sample prepared by dry mixing in air and were not influenced by the compaction pressure, whereas in the case of dry mixing they varied with the compaction pressure and had a maximum value at 2.1 × 10⁸ Pa. The effect of mixing procedure and compaction pressure of reactant powders on the α-values was found to be explained on the basis of the aggregate size of CuO and ZnO dispersed in the matrix of η-Al₂O₃ fine powder.