Preparation And Characterization Of Coated Glass With Controllable Color And Reflectivity

Offline coating method,adopted in our experiment to prepare colorized glass,has stronger color controllability and better operation flexibility in contrast to the traditional coloring method.The multilayer dielectric film was plated on the glass which was colored by means of film interference.The way for preparing traditional color glass has been changed.Different film systems can be designed according to the requirements,which can be used to make the glass with different colors,so that it can be changed into a fresh decorative material,which can be widely used in building engineering?home decoration?automotive and intelligent display areas.TFCalc software was used to design and calculate the film system,and the process of magnetron sputtering was employed to make the multilayer composite films on the common float glass substrate.TiO₂ thin film was produced by DC sputtering process,using metal Ti target for reactive sputtering and the reaction gas was O₂.SiO₂ thin film was prepared by RF sputtering progress with SiO₂ target.TiO₂and SiO₂,respectively used as high refractive index materials and low refractive index materials,were adopted to prepare composite films.We have successfully prepared five kinds of decorative coated glass and three kinds of functional color coated glass.In addition,the environmental stability of the prepared composite film was tested.The main work can be summarized as the following points:1.The Ti target was used to prepare TiO₂ film.Hysteresis loop between DC voltage and O₂ flow was tested.Oxygen flow was changed from 0 to 1.1sccm and then go back to 0sccm,in which,the target voltage experienced a mutation when the oxygen flow transferred from 0.4sccm to 0.5sccm.When O₂ flow was lower than0.4sccm,the film showed a metallic color;when O₂ flow was greater than 0.5sccm,the film showed a transparent state and Ti element can be considered to be completely oxidized.With the increase of O₂ flow,the deposition rate of the TiO₂ film decreased.When the O₂ flow rate was 1.0sccm,the higher sputtering efficiency and TiO₂ film with high refractive index and the stoichiometric ratio was obtained.2.When the SiO₂ target was sputtered by RF sputtering progress in the pure Ar atmosphere,the refractive index of SiO₂ film would slightly increase because of hypoxia in sputtering cavity.The surface structure of SiO₂ thin film became more and more loose and the refractive index decreased with the increase of sputtering pressure.At the same time,the refractive index and sputtering efficiency of TiO₂ films decrease with the increase of O₂ flow.3.Three layer symmetric film structure was formed by TiO₂ and SiO₂ film on the surface of the glass.Five kinds of colorful coating glass were prepared,such as the purple,blue,green,yellow and pink coated glass.The color coordinates of above samples were?0.295,0.161?;?0.235,0.264?;?0.257,0.430?;?0.469,0.441?and?0.427,0.266?,respectively.In addition,through design and calculation,three types of functional colored glass were prepared.They were blue-light-cut-off coated glass,ultraviolet-cut-off coated glass and"transflective"coated glass.The cut-off rate of blue light?420 to 480nm?was 58.6%,which effectively reduced the transmittance of the blue light.Ultraviolet can be completely shielded by UV cut-off coated glass.The average transmission of visible light greater than 400 nm in wavelength was about86%.The average reflectivity and transmittance of the coating glass with mirror effect was about 60%and 40%in visible light region,respectively.4.The coated glass in this paper has strong ability in anti-alkali corrosion,but weaker in the resistance to corrosion of acid.With the corrosion time prolonged,reflection spectrum drifted towards the short wavelength and the maximum reflectivity decreased.Through analysis the corrosion of TiO₂ thin films,we understood the reasons for the drift of the spectrum.The main reason was that H⁺with high concentration and small size would go into the amorphous fibrous tissue gap of TiO₂ film and corroded the tissue inside and outside the film,so that pore structure inside the film would be formed.Thus,the refractive index and the thickness of the film had a certain decline.After 500?heat treatment in the annealing furnace,the ability to resist acid corrosion was significantly increased.