Mullite whiskers prepared by molten salt method using Si powders

• DOI: 10.1007/s40145-012-0028-7
• Publication Date: 2013-01-08T16:41:18Z
• Authors: Wei Wang; Hongwei Li; Yajie Guo; Qiang Sun; Chen Chen
• Keywords: Mullite

Mullite whiskers were prepared from Si powders in molten Al2(SO4)3-Na2SO4 mixture salts with different Al/Si molar ratio (R) of raw materials. The resulting mullite whiskers, had been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and infrared spectroscopy analysis (FT-IR). phase was obtained when the temperature reached at 850 °C. SEM EDS results revealed that two kinds microstructures formed final product, Al-rich pellets clusters tiny crystals, content increased higher adopted A new oxidation-dissolution mechanism proposed to explain growth. According thermodynamic analysis, might be spontaneously as decomposition aluminum sulfate (1023 K).