| Structure Formation of a Double Sintered Nanocrystalline
Silica Xerogel Converted From Sago Waste Ash |
H. Aripin,* Seitaro Mitsudo,1 I. Nyoman Sudiana,2 Teruo Saito1 and Svilen Sabchevski3
Pages : 11-15
DOI : 10.1080/0371750X.2014.980850 |
| Abstract |
| In the present study, double sintered nanocrystalline silica xerogel (NSX) bulk material has been produced from
amorphous silica xerogel (ASX) powders extracted from sago waste ash. The ASX powders have been sintered at
1200oC, milled, pressed and then re-sintered at temperatures ranging from 1200o to 1600oC. The crystallization
process of the NSX has been examined by thermal analysis (DSC/TGA) and X-ray diffraction (XRD), while the
functional groups and the structure have been identified by infrared and Raman spectroscopy, respectively. From
the DSC analysis it has been found that the tetragonal phase of ?-cristobalite transforms to the stable phase of
SiO2, namely cubic ?-cristobalite in the samples re-sintered at 1600oC. This observation has been corroborated by
an analysis of the XRD patterns, infrared and Raman spectra. The obtained data suggest that such novel material
could be considered as an appropriate alternative for deposition of ceramic coatings on various machine and tool
parts, e.g. components of gas-turbine engines.
[Keywords: Nanocrystalline silica xerogel, Amorphous silica xerogel, Sago waste ash,
Double sintering temperature, Structure formation] |
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