Vacuum coating technology of vacuum coating machine
Advantages of vacuum coating technology over traditional electroplating technology: In the past, electroplating and chemical plating were used for coating, not only the thickness is difficult to control, the uniformity of the coating is poor, the adhesion is poor, but also there are serious problems such as three wastes pollution. Today, people's awareness of environmental protection is gradually strengthened, and its development has been restricted by various aspects. The process of vacuum coating technology is simple, environmental improvement, no pollution, less consumables, even and compact film-forming, and strong adhesion with the substrate. Compared with the traditional electroplating method, vacuum coating technology has many advantages, such as good decorative effect, strong metal texture, low cost (about 1 / 3 ~ 1 / 2 of the traditional electroplating), easy operation, etc. Especially in the application of non-metallic objects, it has the incomparable advantages of traditional electroplating. In view of this, vacuum coating has been widely used in the metallization of various plastics, ceramics, glass, wax, wood and other products.
Coating is to coat a transparent electrolyte film or a metal film on the surface of the material by physical or chemical methods, the purpose is to change the reflection and transmission characteristics of the material surface.
In the range of visible light and infrared wavelengths, the reflectivity of most metals can reach 78%~98%, but not higher than 98%. For CO2 lasers, copper, molybdenum, silicon, germanium, etc. are used to make mirrors, germanium, gallium arsenide, zinc selenide are used as output window and transmission optical element materials, or ordinary optical glass is used as mirrors for YAG lasers , Output mirror and transmission optical element materials, can not meet the requirements of more than 99% of the total reflection mirror. The output mirror has different transmittance requirements in different applications, so optical coating methods must be adopted.
For the infrared band of CO2 laser lamps, the commonly used coating materials are yttrium fluoride, praseodymium fluoride, germanium, etc.; for the near-infrared or visible light band of YAG laser lamps, the commonly used coating materials are zinc sulfide, magnesium fluoride, titanium dioxide, oxide Zirconium etc. In addition to high-reflection film and anti-reflection film, it can also be coated with special films that increase reflection for a certain wavelength and increase transmission for another wavelength, such as spectroscopic films in laser frequency doubling technology.
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