%0 Journal Article
%T Comparative Research on the Synthesis of Aluminum Titanate Powders by a¤Nonhydrolytic and Hydrolytic Sol-Gel Method
%A WEI Heng-Yong
%A JIANG Wei-Hui
%A LIN Jian
%A FENG Guo
%A FENG Zhao-Bin
%J 无机材料学报
%D 2009
%I Science Press
%R 10.3724/sp.j.1077.2009.00199
%X Aluminum titanate powder was synthesized by nonhydrolytic and hydrolytic sol-gel method, respectively. The sol-gel process, the phase transformation and the sintering properties of powders were studied by TG-DTA, XRD, FT-IR and SEM analysis. The results show that during the hydrolytic sol-gel process, the Al3+ ions mostly exist in the interspace of Ti aO aTi network. As a result, only rutile and corundum are separated from the hydrolytic gel, the Al2TiOa5 has to be synthesized at 1350  Comparatively, the gel network is formed through the polymerization reaction of Al3+ and Ti4+ ions in nonhydrolytic sol-gel process, these ions occupy the similar position to build the gel network together. Therefore, the armorphous phase is directly crystallized at 750  s aluminum titanate. The particle size and specific surface area of Al2TiO5 powders prepared by hydrolytic sol-gel method are 1￡2|  and a 3.2m2/g. It is dropped to a 0.1￡0.3aa|  under nonhydrolytic sol-gel method, while the specific surface area of the powders is 35 times of hydrolytic sol-gel sample. The bending strength of the sintered Al2TiO5 ceramic prepared by nonhydrolytic sol-gel method is 2.3 times of hydrolytic sol-gel sample, which is only 7.2MPa. It indicates that the properties of Al2TiO5 powders prepared by nonhydrolytic sol-gel method are better than that of hydrolytic sol-gel sample.a¤
%K nonhydrolytic sol-gel
%K hydrolytic sol-gel
%K aluminum titanate
%K powders
%U http://www.jim.org.cn/fileup/PDF/20090143.pdf