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What are the characteristics of vacuum coating processing?

Release time:

2022-08-17

Vacuum coating manufacturers believe that the cleanliness of the vacuum coating surface is very important and directly affects the quality of the electroplating products. Before entering the paint shop, the parts to be processed must be carefully cleaned before electroplating. Surface contamination comes from various dust, lubricating oil, machine oil, polishing paste, grease, sweat, etc. attached to the parts during processing, transportation, and packaging. In order to avoid defects in the processing process, vacuum coating manufacturers can basically remove them through degreasing or chemical cleaning methods.

　　Vacuum Coating Processing The manufacturer believes that the cleanliness of the vacuum-coated surface is very important and directly affects the quality of the electroplated product. Before entering the paint shop, the parts to be processed must be carefully cleaned before electroplating. Surface contamination comes from various dusts, lubricating oils, engine oils, polishing pastes, greases, sweat, etc. attached to the parts during processing, transportation, and packaging. Vacuum coating processing manufacturers can basically remove them through degreasing or chemical cleaning methods to avoid defects during processing.

　　Vacuum coating manufacturers believe that the cleaned surface should not be stored in the atmospheric environment, but should be stored in a sealed container or clean cabinet to reduce dust pollution. Storing glass substrates in newly oxidized aluminum containers can reduce the adsorption of hydrocarbon vapor. Because these containers preferentially adsorb hydrocarbons. Vacuum coating treatment of highly unstable and water vapor-sensitive surfaces should generally be stored in a vacuum drying box.

　　Vacuum coating manufacturers believe that vacuum coating technology removes dust from the coating chamber, establishes a high-cleanliness workshop, and maintains a high degree of cleanliness indoors. These are the basic environmental requirements for coating technology. In areas with high air humidity, in addition to carefully cleaning the substrates and parts in the vacuum chamber before electroplating, baking and degassing are also required. To prevent oil from being brought into the vacuum chamber, pay attention to the return oil of the oil diffusion pump, and take oil-blocking measures for diffusion pumps with high heating power.

　　Vacuum coating manufacturers believe that vacuum evaporation coating is to use resistive heating to evaporate the coating material in a vacuum, so that it evaporates in a short time, and the evaporated coating material molecules are deposited on the surface of the substrate to form a coating. The vacuum coating chamber is the evaporation source of the evaporated coating material, and the work frame or winding device that supports the substrate is the main part of the vacuum evaporation coating equipment. The vacuum degree of the coating chamber, the evaporation rate of the coating material, the evaporation distance and the distance between the evaporation source, and the surface state and temperature of the substrate are all factors that affect the coating quality.

　　Vacuum coating manufacturers believe that magnetron sputtering is also called high-speed low-temperature sputtering. At present, magnetron sputtering has been widely used in the fields of electrical thin films, optical thin films, and plastic metallization. Magnetron sputtering is to fill the vacuum with inert gas and apply high-voltage DC electricity between the plastic substrate and the metal target.

　　 Vacuum Coating Processing Manufacturers believe that compared with evaporation coating, magnetron sputtering coating has the advantages of strong bonding force between the coating and the substrate, and dense and uniform coating. Vacuum evaporation coating requires evaporation of metals or metal chemicals, and the heating temperature cannot be too high, otherwise the evaporated metal will burn the plastic substrate of the coating. Therefore, vacuum evaporation is generally only applicable to low-melting-point metal sources such as aluminum, and is a widely used vacuum coating technology. Conversely, sputtering coating is a plasma coating material excited by a high-voltage electric field, applicable to almost all high-melting-point metals, alloys, and metal compound coating source materials, such as chromium, molybdenum, tungsten, titanium, silver, and gold. In addition, this is a compulsory deposition process. The coating obtained by this method has a much higher bonding force with the substrate than vacuum evaporation. The coating is dense and uniform, and the processing cost is higher.

Key words:

Some common sense about vacuum coating processing

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Some common sense about vacuum coating processing

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