With the continuous improvement of living standards, the use of coating is becoming more and more extensive, and the requirements for coating technology are also getting higher and higher, and various types of pvd coating machines have begun to appear gradually. However, when it comes to the uniformity of the thin film, the uniformity of the thin film coated by most vacuum equipment will be affected by various factors. Now let's take a sputter-controlled sputter coating machine to see what are the factors that cause the non-uniformity.

The working principle of the pvd coating machine is actually very simple. It is to bombard the target with argon ions formed by electron bombardment of argon gas through an orthogonal magnetic field in a vacuum state, and the target ions are deposited on the surface of the workpiece to form a film. In this way, the manufacturer of the lamp coating machine should consider the three aspects related to the uniformity of the film thickness: the vacuum state, the magnetic field, and the argon gas. The vacuum state needs to be controlled by the pumping system. Each pumping port must be activated at the same time 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 effect on the motion of ions. In addition, the pumping time should also be controlled. If it is too short, the vacuum will be insufficient, but if it is too long, it will waste resources. However, if there is a vacuum machine, it is not a problem to control it well. The following describes how to control the uniformity of the film layer. Sexual issues, what conditions are required.
 
1. The cleaning of the surface of the substrate (substrate) in the vacuum coating process is very important. Before the substrate enters the coating chamber, it should be carefully cleaned before plating to achieve the purpose of degreasing, decontamination and dehydration of the workpiece. Substrate surface contamination comes from various dust, lubricating oil, engine oil, polishing paste, grease, perspiration, etc. adhered to the parts during processing, transmission and packaging; the oxide film generated on the surface of the part in humid air; the surface of the part absorbs and adsorbed gas. These contaminants can basically be removed by degreasing or chemical cleaning methods. The cleaned surfaces that have been cleaned should not be stored in the atmospheric environment, but should be stored in closed containers or cleaning cabinets to reduce dust contamination. Storage of glass substrates in freshly oxidized aluminum containers minimizes the adsorption of hydrocarbon vapors. Because these vessels preferentially adsorb hydrocarbons. For highly unstable, water-vapor-sensitive surfaces, storage should generally be in a vacuum oven. Clearing the dust in the coating room, setting up a clean workshop, and keeping the room highly clean are the basic requirements of the coating process for the environment. In areas with high air humidity, in addition to carefully cleaning the substrate and various components in the vacuum chamber before plating, baking and degassing are also required. To prevent oil from being brought into the vacuum chamber, pay attention to the oil diffusion pump returning oil, and oil blocking measures must be taken for the diffusion pump with high heating power.
 
Second, the basic principle of coating and coating
     A. Raw materials and basic principles:
The raw materials are all resins, polymers, Teflon, silicone, acrylic acid, silicate, etc., and the accessories, formulations and measurements are different. For example, if the emulsifier added is mixed in different amounts, the emulsified state will be different, and it can be achieved in water, milk and paste forms. These substances partially penetrate or form films after emulsification and demulsification.
     B. Their characteristics and differences:
Coating: good penetration function (depending on the particle size of the raw material), better surface smoothness, more "capillary holes", roughness, heavy spray paint on the paint surface, and the paint surface itself is hard and needs to increase the brightness of European and American car paints face is more applicable.
Coating: Coating products are added with film-forming auxiliaries and curing agents, and vacuum coating manufacturers make it instantly form a film, and the properties have changed accordingly. For example, the hardness is higher than that of sealing glaze, which is more suitable for paint surfaces that need to improve the hardness of the paint surface (such as Japanese and Korean cars).
Special note: In terms of the function of filtering and reflecting ultraviolet rays, the grid-resistant coating is better than the coating. Because it does not need to add film-forming aids and curing agents and other ingredients, a purer quartz glass molecular covering layer + fusion layer, it has stronger dual filtering and UV reflection capabilities. What is worth worrying about is that inferior coating products use non-environmentally friendly film-forming additives, which may even cause secondary chemical damage to the paint surface.
The main performance of the protective layer:
        ①Prevent the oxidation and fading of the original car paint: block ultraviolet rays and minimize the transmission damage of ultraviolet rays.
        ②Increase the brightness of the paint surface: The crystal clear glass molecules make the car paint surface bright and dazzling.
        ③Improve the hardness of the paint surface: improve the anti-wear and anti-scratch performance.
        ④ Prevent chemical damage and prolong the life of paint surface: such as alkaline car wash, acid rain salt spray, insect sap gum,
High temperature and cold damage to car paint.
        ⑤Increase the smoothness of the car watch: it feels silky and smooth, reduces static electricity, dust adhesion and wind resistance coefficient, making daily maintenance more convenient.