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In order to optimize the phase composition and grain size of alumina fibers, 0-3 wt% SiO 2  were induced to prepare alumina fibers using sol-gel method with the reaction of aluminium powder, formic acid, acetic acid, nitric acid and SiO 2  sol. Effects of low SiO 2  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 α-Al 2 O 3 , and the phase transformation path of alumina was changed from amorphous alumina → γ-Al 2 O 3  → α-Al 2 O 3  to amorphous alumina → γ-Al 2 O 3  → θ-Al 2 O 3  → α-Al 2 O 3 . Moreover, scanning electron microscopy and transmission electron microscopy results confirmed that the addition of SiO 2  reduced the grain size and was beneficial for the dense structure. Fine-grained dense alumina fibers composed of α-Al 2 O 3  phase and transitional alumina phase were obtained by adding 1 wt% and 3 wt% silica after sintering at 1200°C for 1 h.

Effects of SiO 2 Addition on Phase Transition and Microstructure Evolution of Alumina Fibers Prepared Using the Sol-Gel Method