Common Problems of Evaporation Process and Sputtering Process of Vacuum Coating Equipment

 1. Why can vacuum coating be made into different colors and seven colors?

        Because a layer of UV varnish topcoat is sprayed after the vacuum evaporation, different colors can be made on this topcoat. Evaporation can make seven colors by plating some silicides, but it is relatively thin. Layers of different colors of coating to present colorful.

 2. What is the reason for the difference in adsorption between vacuum evaporation and vacuum sputtering coatings?

       Evaporation is adhesion, and sputtering is the strong adsorption of positive and negative electrodes, so the adsorption of sputtering is more uniform, density, and hardness. The price of sputtering is 10%-20% more expensive than that of evaporation.

3. Why can vacuum coating be made semi-transparent and non-conductive?

        It is not completely non-conductive, using the discontinuity of molecules in the thin film state, metals or metal compounds are conductive, but the conductivity is different. However, when the metal or metal compound is in the state of a thin film, its corresponding physical properties are different. Among conventional coating materials, such as: silver is the metal with the best silver-white effect and conductivity, but when its thickness is less than 5 nanometers, it is non-conductive; the silver-white effect and conductivity of aluminum are slightly worse than silver, but it is not conductive. When the thickness is 0.9 nanometers, it is already conductive. Why is this so? That's because the continuity of silver molecules is not as good as that of aluminum, so its conductivity is worse under the relative film thickness. Our vacuum metallized non-conductive film actually uses the principle of poor molecular continuity of some metals, and controls its thickness within a certain range to make it have a silver-white appearance and high resistance. It can be seen that the effect of the metal non-conductive film is directly related to its film thickness. Only under the corresponding film thickness, a correspondingly stable silver-white non-conductive film can be obtained.