ZHOU Xinmiao ¹, JIANG Weihui ^{1, 2}, FENG Guo ¹, LIU Jianmin ¹, ZHANG Quan ¹, WU Qian ¹
(1. School of Material Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. National
Engineering Research Center for Domestic & Building Ceramics, Jingdezhen Ceramic Institute, Jingdezhen 333001, Jiangxi, China)

Abstract: Cordierite powder was synthesized via non-hydrolytic sol-gel method by using aluminum as aluminum source. The phase transition of xerogel during the heat treatment and the effect of magnesium sources on the synthesis of cordierite powder were investigated by XRD, DTA-TG, FT-IR and thermal expansion instrument. The results show that μ-cordierite phase can be synthesized at 900 ℃, it transforms to α-cordierite at 1050 ℃, and pure α-cordierite powder can be obtained at 1200 ℃ via non-hydrolytic sol-gel method. The thermal expansion coefficient of its sintered ceramic body is 1.329×10^-6/℃. Compared with anhydrous magnesium chloride and magnesium ethanol, anhydrous magnesium acetate is more beneficial to the formation of Mg-O-Al and Mg-O-Si heterogeneous bonds in the gel, thereby facilitating low temperature synthesis of cordierite.
Key words: non-hydrolytic sol-gel method; cordierite; synthesis; magnesium sources; thermal expansion coefficient