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Synthesis and characterisation of gel-derived mullite precursors from rice husk silica

机译：稻壳二氧化硅凝胶衍生的莫来石前体的合成与表征

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The sol-gel synthesis and characterization of mullite precursor derived from rice husk silica and aluminum nitrate hydrate [(Al(NO_3)_3· 9H_2O] has been investigated. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) coupled with Rietveld analysis, and scanning electron microscopy (SEM). FTIR results showed the presence of Si-O-Si, Al-O-Al, and Si-O-Al functional groups, which were associated with mullite, corundum, quartz, and cristobalite, as verified by XRD analysis. It is concluded that mullite formation started at 1150 °C, and its abundance increased rapidly with an increase in temperature from 1150 to 1350 °C, resulting in increased phase content from 30.9 to 67.7 wt%. Although mullite was formed at a low temperature, the complete reaction between corundum and silica to form mullite was not achieved. This finding demonstrated that rice husk silica is a potential alternative raw material for the production of mullite ceramic.
机译：研究了稻壳二氧化硅和硝酸铝水合物[（Al（NO_3）_3·9H_2O]衍生的莫来石前体的溶胶-凝胶法合成及表征，并利用傅里叶变换红外光谱（FTIR），X射线衍射对样品进行了表征。 （XRD）结合Rietveld分析和扫描电子显微镜（SEM）。FTIR结果显示存在Si-O-Si，Al-O-Al和Si-O-Al官能团，它们与莫来石，刚玉相关XRD分析证实，由石英，石英和方石英组成，结论是莫来石的形成始于1150°C，随着温度从1150升高至1350°C，其富集度迅速增加，导致相含量从30.9增加至67.7尽管莫来石是在低温下形成的，但刚玉与二氧化硅之间并不能完全反应生成莫来石，这一发现表明稻壳二氧化硅是生产莫来石陶瓷的潜在替代原料。我知道了。

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