Abstract
Zirconia–silica (50/50 vol.%) nanocomposites were prepared by supercritical CO 2 method at 15 MPa and 150 °C. The characterization of synthesized powders was carried out by X-ray diffraction (XRD), transmission electron microscopy (TEM) scanning electron microscopy (SEM) and BET. The results of XRD showed that the nanocomposite powders have mostly the tetragonal phase of zirconia (t-ZrO 2) at 1000 °C, however it was determined the tetragonal (major), monoclinic (minor) of zirconia and cristobalite (major) phases of silica were present at 1500 °C. The crystallite sizes of the t-ZrO 2 were in the range of 8–30 nm with increasing temperature from 1000 °C to 1500 °C. The surface area of samples at 1000 °C was 171 m 2/g. In addition, the agglomeration degree ( N = d BET 3 / d XRD 3 ) of powders at 1000 °C was 4, which was an indication of the soft agglomeration of powders. The stabilization of the t-ZrO 2 up to 1500 °C was attributed to the confinement of ZrO 2 particles by the surrounding cristobalite phase of silica in the structure.
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