Ultra-high vacuum equipment in 1966
In 1966, Columbia University established an ultra-high vacuum device with a molecular weight of 254nm (10 inches) in diameter. Due to the use of molecular sedimentation design, the device can perform simulation tests in a vacuum pressure environment of 10⁻¹⁰Pa. Of the above five ultra-high vacuum systems, except for the first one that is made of glass, the rest are all made of metal, and they all use a 4.2K or 20K low temperature environment. This low-temperature environment is not achievable by ordinary laboratories. Even with such conditions, the operating cost of the equipment is very high. This may be one reason why the development and application of ultra-high vacuum technology is limited. In order to solve this contradiction, people have been seeking new and easier ways to obtain ultra-high vacuum.
Vacuum coating application is a large branch of vacuum application, which has a very wide range of applications in many aspects such as optics, electronics, physical and chemical instruments, packaging, machinery and surface treatment technology. In order to give you a more detailed understanding of the application of vacuum coating, today the editor will introduce to you the main methods of vacuum coating in detail, I hope it will be useful to everyone! The simple understanding of vacuum coating application is to coat metal films or coatings on objects such as metals, glass, ceramics, semiconductors, and plastics using evaporation, sputtering and subsequent condensation in a vacuum environment.
Compared with the traditional coating method, the vacuum coating application is a dry coating, and its main methods include the following:
1, vacuum evaporation
The principle is to use an evaporator to heat the vaporized material to vaporize or sublimate, and the vaporized ion stream is directed to the substrate, and the solid film is deposited on the substrate.
2, sputtering coating
Sputtering coating is under vacuum conditions, the cathode is connected to a high voltage of 2000V to stimulate glow discharge, and the positively charged argon ions hit the cathode to eject atoms, and the sputtered atoms are deposited on the substrate through an inert atmosphere to form a film layer .
3, ion plating
is the vacuum ion coating that the dry screw vacuum pump manufacturer has already introduced. It is developed on the basis of the above two vacuum coating technologies, so it has both process characteristics. Under vacuum conditions, gas discharge is used to separate the working gas or the evaporated material (membrane), and the evaporated material or its reactants are deposited on the surface of the substrate under ion bombardment. During the film formation process, the substrate is always bombarded by high-energy particles and is very clean.
4, vacuum winding coating
Vacuum winding coating is a technology that uses physical vapor deposition to continuously coat a film on a flexible substrate to achieve some functional and decorative properties of the flexible substrate.
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