Preparation of ZrO2-Al2O3 ceramic composite by sol-jel process, their characterization and examination of parametric effects of ZrO2

High technology ceramics have different crystal phases as well assuperior characteristics such as high temperature resistance and highchemical stability. Among high technology ceramics, Al2O3 and ZrO2ceramic oxides have wide usage possibilities as filter, membrane andcatalyst thanks to their porous structures.In this study, it is aimed to get a composite structure from Al2O3 andZrO2 which are to be produced by sol-gel method. By calcinating ofZrO2-Al2O3 composite material in different temperatures, it wasdetermined that how the change in temperature affected the phasestructure by X-ray diffraction method. In addition, the percentage ofZrO2 in composition has been changed, and the effects of this changeon BET surface area, pore radius distribution of composite materialhave been determined. The changes in the interior structure of materialhave been observed by the scanning electron microscope. Density hasbeen determined by Helium pycnometer.As a result of experiments held, the target composite material ofZrO2-Al2O3 has been produced by sol-gel method. Change in phasestructure, decrease in pore radius and BET surface area have beendetermined by increasing calcination temperature. Pore radius hasbeen shown a change between 4 A° and 20 A°. Micro porous particleshave been produced by sol-gel method. Parametric effect of ZrO2 hasbeen examined. In general, BET surface area decreased when ZrO2 ratein composition increased. In addition, the increase in temperatureresulted the decrease in BET surface area. The highest value of BETsurface area has been determined as 210,93 m2/g in pure Al2O3 samplecalcinated at 600 ºC. Density decreased when ZrO2 rate in compositionincreased. Density value has been shown a change between 1,23 g/mland 1,98 g/ml.