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Common problems in evaporation and splashing process of vacuum coater

2020-05-09

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There are two common coating processes of vacuum coating machine, evaporation and splashing. These two processes are most popular and widely used at present. Then, its attention is naturally much higher than other processes. Here is a summary of four common problems about the two processes of vacuum coating machine, which I hope can help you:

pvd coating machine

1、 Why can vacuum coating be made into different colors, and seven colors?
Because after the vacuum evaporation, a layer of UV varnish will be sprayed, and different colors can be made on this layer of paint. Evaporation plating can be made into seven colors by plating some silicides, but it is relatively thin, which can be seen in the near and not obvious in the far view; sputtering can be made into seven colors by reactive plating with CSI, Co, Si and other substances, or it can be made into many colors by low temperature multi-layer coating of different colors.
But the water electroplate's general is the metal natural color, must present other colors needs to apply the UV topcoat and then the UV irradiation.
2、 What is the reason for the difference of adsorption between vacuum evaporation and vacuum splashing?
Sputtering is a strong adsorption of positive and negative electrodes, so the adsorption of sputtering is more uniform, the density is greater, the hardness is greater, and the price of sputtering is 10% - 20% higher than that of evaporation.
3、 Why is vacuum coating semi transparent and non conducting?
It is not completely non-conductive. The discontinuous metals or metal compounds in the film state have conductivity, but the conductivity is different. However, when a metal or a metal compound is in a film state, its corresponding physical properties will be different. Among the conventional coating materials, for example, silver is the metal with the best silver white effect and conductivity, but when its thickness is less than 5 nm, it is non-conductive; the silver white effect and conductivity of aluminum are slightly worse than that of silver, but when its thickness is 0.9 nm, it has conductivity. Why is that? That's because the continuity of silver molecules is not as good as that of aluminum, so the conductivity of silver molecules is poor under the relative film thickness. In fact, we use the principle of poor molecular continuity of some metals to control its thickness in a certain range, so that it has a silver white appearance and large resistance. It can be seen that the effect of metal nonconductive film is directly related to its film thickness. Only under the corresponding film thickness, the corresponding stable silver white non conducting film can be obtained.
It is not completely non-conductive. The discontinuous metals or metal compounds in the film state have conductivity, but the conductivity is different. However, when a metal or a metal compound is in a film state, its corresponding physical properties will be different. Among the conventional coating materials, for example, silver is the metal with the best silver white effect and conductivity, but when its thickness is less than 5 nm, it is non-conductive; the silver white effect and conductivity of aluminum are slightly worse than that of silver, but when its thickness is 0.9 nm, it has conductivity. Why is that? That's because the continuity of silver molecules is not as good as that of aluminum, so the conductivity of silver molecules is poor under the relative film thickness. In fact, we use the principle of poor molecular continuity of some metals to control its thickness in a certain range, so that it has a silver white appearance and large resistance. It can be seen that the effect of metal nonconductive film is directly related to its film thickness. Only under the corresponding film thickness, the corresponding stable silver white non conducting film can be obtained.