FENG Guo 1, JIANG Weihui 1, 2, LIU Jianmin 1, ZHANG Quan 1, HU Zi 1, MIAO Lifeng 1, WU Qian 1
(1. National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen Ceramic Institute, Jingdezhen 333001,
Jiangxi, China; 2. Department of Material Science and Engineering, Jingdezhen Ceramic Institute, Jiangxi Key Laboratory of
Advanced Materials Jingdezhen 333403, Jiangxi, China)
Abstract: Magnesium-stabilized aluminum titanate powder was prepared via non-hydrolytic sol-gel method using titanium tetrachloride and anhydrous aluminium chloride as precursors, anhydrous ethanol as the oxygen donor, and anhydrous magnesium acetate as the stabilizer. The effects of anhydrous magnesium acetate’s addition time on low-temperature synthesis of magnesium-stabilized aluminum titanate powder via non-hydrolytic sol-gel method, and the role and mechanism of different anhydrous magnesium acetate’s addition order and time were investigated by XRD, FT-IR and thermal expansion dilatometer. The results show that the addition of anhydrous magnesium aluminum before the condensation reaction of aluminum and titanium precursors is not only detrimental to low temperature stabilization of aluminumtitanate, but also affects the low temperature synthesis of aluminum titanate. Anhydrous magnesium acetate can further polycondensate with polycondensation products of aluminum and titanium precursors to form heterogeneous bonds with ether elimination, which ensures that the magnesium stabilizer can enter the lattice of aluminum titanate at 750 °C to form a solid solution, so as to improve its thermal stability .
Key words: aluminum titanate; Mg-stabilization; nonhydrolytic sol-gel method; addition time; thermal expansion coefficient