期刊
CERAMICS INTERNATIONAL
卷 45, 期 6, 页码 6639-6647出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.12.152
关键词
Zircon; Amorphous silica; Cristobalite; Tetragonal zirconia; Monoclinic zirconia; Nanopowder
资金
- Ministry of Research Technology and Higher Education of the Republic of Indonesia
- Institute for Research and Community Services ITS under the PBK program [852/PKS/ITS/2018]
- PMDSU program
High-purity zircon (ZrSiO4) nanopowder was successfully produced from Indonesian natural zircon sand using a low-cost purification approach via magnetic separation, immersion in HCl, and reaction with NaOH, followed by a top-down nanosizing process using wet ball-milling for 10 h and annealing at 200 degrees C for 2 h. Furthermore, polymorph zirconia (ZrO2 - amorphous, tetragonal, and monoclinic) and silica (SiO2 - amorphous and cristobalite) nanopowders were also successfully derived from the purified zircon powder using a bottom-up method via alkali fusion and co-precipitation processes followed by calcination. The crystallite size of the powders was estimated from X-ray diffraction (XRD) data analysis to give 40, 31, 61, and 149 nm, respectively, for the zircon, tetragonal- and monoclinic-zirconia, and cristobalite. Microstructural characteristics of the zircon, silica, and zirconia nanopowders were revealed in transmission electron microscopy (TEM) images which confirmed that the average sizes of the particles were in a good agreement with the XRD estimated values.
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