The synthesis of nanocrystalline zirconia - silica composite powders with supercritical CO2 method and the prevention of agglomeration problem

The most fundamental concerns during the synthesis of nanopowder is to prevent the powder from agglomeration. Nanoparticles having high surface area tend to agglomerate very easily. This , thus, emerges as the biggest technological problem.In this study, nanocrystalline ZrO2-SiO2 composite powder was successfully synthesized by using supercritical CO2 method, and agglomeration problem of this powder was under control, and tetragonal zirconia phase was stabilized at a wide range of temperature.In order to synthesize nanocrystal ZrO2-SiO2 composite powder via supercritical CO2 method, the degree of agglomeration was decreased to 5 without any additions to the initial solution.Keywords: Agglomeration, Nanocrystalline, Nanopowder, Silica, SiO2, Supercritical CO2, Zirconia, ZrO2.