ZHOU Jian'er, ZHANG Xiaozhen, CAI Xi'e, WANG Yongqing, HU Xuebing
(Key Laboratory of Jiangxi Universities for Inorganic Membranes, Jingdezhen Ceramic Institute, Jingdezhen 333001)
Abstract:Porous acicular mullite ceramic was prepared by in -situ reaction sintering, us ing Al-source materials and clay as the main raw materials. The influences of different Al -source materials (α-Al2O3, γ-Al2O3 and Al(OH)3) on the phase composition, microstructure and local element distributions were investigated by means of XRD, SEM and EDS analysis.Results show that the content of mullite was 88.77% for the prepared porous ceramic with Al(OH)3 as Al-source material and sintered at 1400℃ for 2h, which was much higher than those from α-Al2O3 and γ-Al2O3 (55.65% and 76.78%, respectively).A slenderness ratio of about 10 could be obtained for all the as-synthesized acicular mullite grains. The porous acicular mullite ceramic from Al(OH)3 shows well-crystallized mullite phase, higher porosity and bending strength.
Keywords:mullite, al-source material, synthesis, slenderness ratio