Introduction to basic knowledge of vacuum coating equipment

All kinds of objects in daily life are inseparable from the surface coating with a thin layer of film, some are coated with various colors, and some are to change the functionality of the surface. As long as you pay attention to it in daily life, you can find many products coated with a layer of surface film, such as tableware, hardware, parts, cameras, mobile phone cases and so on.
        The following Dingyi vacuum machinery and equipment technology will introduce the coating principle of vacuum coating equipment and the requirements for the environment in detail:

          The vacuum coating machine uses the orthogonal magnetic field in the vacuum state to make the argon ions formed by the electron bombardment of the argon gas and then bombard the target, and the target ions are deposited on the surface of the workpiece to form a film. In this way, car lamp coating machine manufacturers should consider three aspects related to the uniformity of film thickness: vacuum state, magnetic field, and argon gas. The vacuum state needs to be controlled by the pumping system. Each pumping port must be activated at the same time and with the same force, so that the uniformity of the pumping can be controlled. If the pumping is not uniform, the pressure in the vacuum chamber will not be uniform. Pressure has a certain influence on the movement of ions.

         (1) Environmental requirements of vacuum coating
         It is very important to clean the surface of the vacuum coating process substrate (substrate). Before the substrate enters the coating chamber, it should be carefully cleaned before coating to achieve the purpose of degreasing, decontaminating and dehydrating the workpiece.
Substrate surface pollution comes from various dust, lubricating oil, engine oil, polishing paste, grease, sweat stains, etc. adhered to parts during processing, transmission, and packaging; oxide film formed on the surface of parts in humid air; absorption and Adsorbed gas. Basically, these dirt can be removed by degreasing or chemical cleaning.
The cleaned surface should not be stored in the atmosphere, but should be stored in closed containers or cleaning cabinets to reduce dust contamination. Storage of glass substrates in just oxidized aluminum containers minimizes adsorption of hydrocarbon vapors. Because these containers preferentially adsorb hydrocarbons. For highly unstable, water vapor-sensitive surfaces, they should generally be stored in a vacuum oven.
Removing the dust in the coating room, setting up a clean workshop, and keeping the room clean are the basic requirements for the coating process to the environment. In areas with high air humidity, in addition to carefully cleaning the substrate and various parts in the vacuum chamber before plating, baking and degassing must also be carried out. To prevent oil from being brought into the vacuum chamber, pay attention to the return of oil from the oil diffusion pump, and oil-retaining measures must be taken for diffusion pumps with high heating power. ,

         (2) Basic principles of coating and coating
         A. Raw materials and basic principles:
       The raw materials are all resins, polymers, Teflon, silicone, acrylic, silicate, etc. The excipients, formulations and measurements are different. For example, if the added emulsifier is mixed in different amounts, the emulsified state will be different, and water, milk, and paste can all be realized. After these substances are emulsified and broken, they partially permeate or form a film.
        B. Their characteristics and differences:
        Coating layer: good penetration function (depending on the particle size of the raw material), better surface smoothness, for European and American car paints with more "capillary pores", rough paint surface, heavy spray paint, and hard paint surface itself that need to increase brightness face is more applicable.

         Coating:
         However, the film-forming aids and curing agents are added to the coating products to make them form a film instantly, and the properties change accordingly.

        There are many types of vacuum coating equipment on the market. Some vacuum coating equipment are named according to the technology used, and some vacuum coating equipment are named after the field of application. The application field is different, the name is different, the model is different, but The basic principles of coating and coating are similar.