Investigation On Preparation And Properties Of CeO₂-TiO₂ Film By Sol-Gel Process

The golden and ultraviolet-absorbed glass used cerium and titanium as the colorant by the sol-gel process meets the people's requirement. In this thesis, the theory of coloration and property of ultraviolet-absorbed glass were discussed. At the same time, the research status in quo of the golden and ultraviolet-absorbed glass was introduced, comparing the relative merits between techniques. And the necessity of the research on the CeO₂-TiO₂ films on slices by the sol-gel process was raised. Color difference meter (WSC-S) was used to get the color coordinates of the coated glasses to receive the due proportion of Ce/Ti (mol) in the solution. Spectrophotometer (UV-1601) was availed to measure the transmission curves (200nm⁸00nm) of the coated glasses to find the transmission rules with different Ce/Ti(mol) in the solutions , treatment temperatures, the number of the coatings ,aging time of the solution.The abrasion and acid resistance of the film were discussed in different treatment temperatures and times. At last, the solution's pH and the relatively proportion of H₂O in the solution were studied to find their effect to the film performance of the solution.In addition, the gelification process of the composite was investigated by using DSC-TG and SEM measurements, and the range of the treatment temperature was chosen by it. XPS was used to analyzed the relation of Ce³+/Ce⁴+ Ti³+/Ti⁴+(mol) in the film and the color of the coated glass. Besides, the microstructure, combination of the film and glass, recrystallization of the films were investigated by metallographic microscope, XRD, and SEM.The results indicated that the films with an ratio of Ce /Ti(mol) between 3:5-5:6 were golden, and the properties of the ultraviolet-absorbed glasses were enhanced by the increasing of the ratios of Ce /Ti(mol) in the solution. But when the ration of Ce /Ti (mol) reached 1.5, the film on the glass was not even. By the hoist of the calcining heats, the wavelengths of the color of the coated glasses were more or less same, with the decreasing of the color's saturation. In the transmission curves, the peak values were at the same wavelength. With the increasing heat-treated temperature, the intensity of the peaks decreased, but the roughness of the films were increased. The abrasion and acid resistance of the film were also enhanced by the increasing of thecalcining heats. 340 °C was found to be the appropriate calcining heat. Otherwise, with the prolonging the time of the heat preservation, the grains in the film gradually became compact. Acid resistance of the film was enhanced, but the abrasion resistance didn't change apparently. By the increasing of the number of coating, the color of the coated film became deeper. The roughnesses of the films were also increased with the transmission decreased in the visible light. The higher transmission was attained by the films prepared from sols which were aged longer. The ratio of H2O added to the solution speeded the hydrolysis of titanium alkoxide, so the color of the solution was deeper. And when FkO/CieEbeCUTi (mol) >9,the even films couldn't be gotten on the glasses. In the research it was also found that with decreasing of the pH of the solution, the color of the solution lighter, and even films could be gotten. When pH>6.5 there was lots of deposition in the solution as well as when the solution's pH>7.0 by which the even films couldn't be gotten. So solution's pH<5.5 was the appropriate range to get the better film on the slices.