中文摘要：

分别采用非水解和水解溶胶-凝胶法合成钛酸铝粉体,利用FT-IR、DTA-TG、XRD、SEM等方法研究了溶胶-凝胶转变和合成相变化过程及粉体烧结性能.结果发现：水解凝胶过程中Al^3＋以网络外离子形式富集于Ti-O-Ti凝胶网络之间,凝胶依次晶化成金红石和刚玉,再通过固相扩散在1350℃时合成钛酸铝,粉体粒径为1～2μm,比表面积仅3.2m^2/g,1400℃烧结后抗弯强度为7.2MPa.非水解凝胶化过程中A l^3＋和Ti^4＋通过聚合共同形成凝胶网络,其在网络结构中地位趋同,凝胶在750℃已直接由无定型晶化为钛酸铝,粉体粒径为0.1～0.3μm,比表面积与抗弯强度分别为水解法样品的35倍和2.3倍,性能较好.

英文摘要：

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 Al63＋ ions mostly exist in the interspace of Ti-O-Ti network. As a result, only rutile and corundum are separated from the hydrolytic gel, the A12TiOs has to be synthesized at 1350℃. Comparatively, the gel network is formed through the polymerization reaction of Al^3＋ and Ti^4＋ 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℃ as aluminum titanate. The particle size and specific surface area of Al2TiO5 powders prepared by hydrolytic sol-gel method are 1 -2 μm and 3.2m^2/g. It is dropped to 0.1 -0.3μm under nonhydrolytic sol-gel method, while the specific surface area of the powders is 35 times of hydrolytic solgel 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.