Abstract
ZrO2 spherical nanometer powders containing 3.5 mol% Y2O3 have been prepared via the coupling route of water/oil (W/O) emulsion with dimethyl oxalate homogenous precipitation. ZrO2 powders and their precursor powders have been characterized by XRD, TEM and SEM. According to the XRD result, phase volume fractions of powders were calculated by comparing the peaks’ intensities of spectrum. Furthermore, phase crystal lattice constants were obtained using crystal interplanar spacing formula and Bragg equation. With these results, the theoretical density of powders was analyzed. Finally, powders’ spherical degree was revealed via the method of comparison between theoretical density and actual density.
Highlights
ZrO2 is widely applied in many advanced structural ceramics, high-temperature ceramics and electronic devices for its low thermal conductivity, high mechanical strength and relatively high thermal expansion coefficient [1,2,3,4]
To obtain uniform microstructure with a low sintering temperature and high density, the particles of ceramic powders must be spherical with narrow size distribution [5,6,7]
The preparation of ZrO2 spherical nanometer particles has been the research focus in recent years [12,13,14,15,16]. Different characterization methods, such as TEM and SEM have been applied to analyze the spherical degree of ZrO2 powders
Summary
ZrO2 is widely applied in many advanced structural ceramics, high-temperature ceramics and electronic devices for its low thermal conductivity, high mechanical strength and relatively high thermal expansion coefficient [1,2,3,4]. To obtain uniform microstructure with a low sintering temperature and high density, the particles of ceramic powders must be spherical with narrow size distribution [5,6,7]. Nanometer particles can further enhance the low-temperature sintering performance of ceramics and enable the ceramics to possess a smaller. Different characterization methods, such as TEM and SEM have been applied to analyze the spherical degree of ZrO2 powders. It is more convincing and necessary to illustrate the spherical degree of powders by using the combination method of theoretical calculation and actual characterization
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