Ultrafine pure mullite powder prepared by sol-gel method

  • Ge M
  • Yang H
  • Jiang Z
 et al. 
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Ultrafine pure mullite powder (3Al2O3·2SiO2) was prepared by the sol-gel method using silicon tetraethoxide and aluminum nitrate as starting materials. The phase transformation process and the effects of a catalyst on mullite gels were determined by differential thermal analysis (DTA) and X-ray diffraction (XRD). The results show that a pure mullite phase was obtained at 980°C in a nitric acid-catalyzed gel. In an ammonia-catalyzed gel, a pure mullite phase forms at 1200°C, while a spinel appears at 980°C. In an ammonium acetate-catalyzed gel, mullite and α-alumina form at 980°C and the main phase mullite appears at 1200°C. A pure mullite phase was obtained at 1300°C. The mean particle size of the mullite powder obtained from the nitric acid-catalyzed gel is

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  • Manzhen Ge

  • Hui Yang

  • Zhonghua Jiang

  • Yanfei Wang

  • Feipeng Zhang

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