Synthesis of monodisperse ZrO 2 microspheres via urea homogeneous precipitation and its effect on the sintering properties

Micro & nano letters

article

Fan Tong¹  Ye Zhao¹  Mao-Hua Wang¹ 

[1] School of Petrochemical Engineering, Changzhou University;Huaide College, Changzhou University

关键词: porosity;    precipitation (physical chemistry);    transmission electron microscopy;    nanofabrication;    grain size;    sintering;    zirconium compounds;    X-ray diffraction;    ceramics;    field emission scanning electron microscopy;    Fourier transform infrared spectra;    nanoparticles;    sintering properties;    monodisperse zirconia microspheres;    homogeneous urea precipitation method;    reaction time;    reaction temperature;    synthetic parameters;    X-ray diffraction;    field emission-scanning electron microscopy;    Fourier-transform infrared spectroscopy;    PVP concentration;    narrow pore size distribution;    grain size;    sintering temperature;    Brunauer-Emmett-Teller analysis;    polyvinylpyrrolidone concentration;    ceramics;    ultrafine uniform microstructure;    theoretical density;    temperature 90.0 degC;    temperature 950.0 degC;    time 2.0 hour;    size 120.0 nm;    ZrO2;   

DOI  :  10.1049/mnl.2018.5328

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Monodisperse zirconia microspheres were prepared by homogeneous urea precipitation method. The effect of reaction time, reaction temperature and other synthetic parameters on the dispersion of the product was investigated in this experiment. The as-prepared zirconium oxide (ZrO 2 ) powders were characterised by X-ray diffraction, Brunauer–Emmett–Teller analysis, field emission-scanning electron microscopy and Fourier-transform infrared spectroscopy. The experimental results show that the size and dispersion of ZrO 2 microspheres can be controlled by changing the concentration of polyvinylpyrrolidone (PVP). The size of ZrO 2 microspheres is changed from 120 nm to 1 μm with the increase of PVP concentration. When the reaction temperature is raised to 90°C and the reaction time is reached to 2 h, the monodisperse ZrO 2 microspheres with a diameter of 120 nm are finally prepared. ZrO 2 ceramics possessed an ultrafine, uniform microstructure and a narrow pore size distribution, and the grain size increased from 72 to 190 nm with the increase of sintering temperature. Moreover, when ZrO 2 ceramics were sintered at 950°C for 2 h, the theoretical density was up to about 98% (a density of 5.65 g/cm 3 ), which is higher than that of conventional ZrO 2 ceramics.

【 授权许可】

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