Preparation of Zirconia-Toughened Alumina Ceramics through the Dispersal Basic Carbonate Precursors
Using NH4HCO3 solution as precipitant, the ultrafine 3Y-ZrO2/Al2O3 precursors were prepared by the liquid-phase precipitation method. The well-dispersible ZrO2/Al2O3 composite nanopowders with particle size 10nm were obtained by calcining the precursor at 1000°C. The XRD patterns show no γ-Al2O3 and θ-Al2O3 formed during calcination. The powders have excellent sinterability and the relative density of specimen is up to 99% after sintering the green compacts at 1550°C. Microstructural analysis of the sintered bodies reveals the uniform distribution of the zirconia grains in the alumina matrix.
Wei Pan and Jianghong Gong
J. Q. Wang et al., "Preparation of Zirconia-Toughened Alumina Ceramics through the Dispersal Basic Carbonate Precursors", Key Engineering Materials, Vols. 336-338, pp. 1137-1140, 2007