From the pvd coating machine coating industry staff, often friends a variety of coating problems, coating technology professional, when you encounter problems, you can troubleshoot and solve, then those who have just entered the industry soon, special circumstances in the coating process, may be more difficult, The following Huicheng vacuum Xiaobian for you to sort out the daily common coating problems, hope to help you:

1. What are the reasons for the difference in adsorption between vacuum evaporation and vacuum sputtering coatings?
Evaporation is adhesion, sputtering is a strong adsorption of positive and negative electrodes, so the adsorption of sputtering is more uniform, greater density and hardness, and the price of sputtering is 10%-20% more expensive than evaporation.
Second, why can vacuum coating be made into different colors, and seven colors?
Because after the vacuum evaporation is finished, a layer of UV varnish is sprayed, which can be done in different colors. Evaporation can be made of seven colors by plating some silicides, but it is relatively thin, can be seen close, and is not obvious from far. Reactive plating through CSi, CO, Si and other substances can be plated with seven colors, or by low temperature multi-layer coating of different colors to present colorful.
The water plating is generally metallic, and other colors need to be coated with UV finish and then UV irradiation.
Third, why can vacuum coating be made semi-transparent and non-conductive?
Not completely non-conductive, taking advantage of the discontinuity of the molecules in the thin film state, the metal or metal compound is conductive, but the conductivity is different. However, when a metal or metal compound is in a thin film state, its corresponding physical properties will be different. In conventional coating materials, such as: silver is the silver effect and the best conductive metal, but when its thickness is below 5 nanometers, it is non-conductive; The silver effect and conductivity of aluminum are slightly worse than that of silver, but it is already conductive when it is 0.9 nanometers thick. Why is this? That's because the continuity of silver molecules is not as good as that of aluminum, so at relative film thickness, its conductivity is poor. Our vacuum gold-plated non-conductive film actually uses the principle of poor molecular continuity of some metals to control its thickness within a certain range, so that it has a silver-white appearance and large 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, the corresponding stable silver-white non-conductive film can be obtained.
Fourth, why does the aluminum plating of vacuum coating not conduct electricity?
Because the coating has a total of three layers, the outermost UV varnish plays the role of curing wear-resistant insulation after UV irradiation, but once this layer of film is destroyed, it conducts electricity.
During the coating process of the pvd coating machine, it is inevitable that various coating problems will occur, such as cleaning the substrate, not cleaning, or vacuum chamber leakage, etc., will produce poor coating products, so it is necessary to master some common coating treatment knowledge.