| Effects of SiO2 Addition on Phase Transition and
Microstructure Evolution of Alumina Fibers Prepared
Using the Sol-Gel Method |
Qiang Liu,a Juan Wang,b Wensheng Liu,a Lingjiao Zhan,a Shaoheng Peng,a Shuwei Yaoa and
Yunzhu Maa, *
Pages : 68-75
DOI : 10.1080/0371750X.2022.2064920 |
| Abstract |
| In order to optimize the phase composition and grain size of alumina fibers, 0-3 wt%
SiO2 were induced to prepare alumina fibers using sol-gel method with the reaction of
aluminium powder, formic acid, acetic acid, nitric acid and SiO2 sol. Effects of low SiO2
content on the phase transition and microstructure of alumina fibers were investigated.
X-ray diffraction analysis and differential scanning calorimetry results showed that the
addition of silica delayed the formation of -Al2O3, and the phase transformation path
of alumina was changed from amorphous alumina -Al2O3 -Al2O3 to amorphous
alumina -Al2O3 -Al2O3 -Al2O3. Moreover, scanning electron microscopy and
transmission electron microscopy results confirmed that the addition of SiO2 reduced
the grain size and was beneficial for the dense structure. Fine-grained dense alumina
fibers composed of -Al2O3 phase and transitional alumina phase were obtained by
adding 1 wt% and 3 wt% silica after sintering at 1200oC for 1 h.
[Keywords: Alumina fiber, SiO2, Sol-gel method, Phase transition] |
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