The principle of vacuum coating machine and the advantages of various components in the analysis of optical sheet sputter coating
Vacuum coating machine is the most widely used vacuum equipment in vacuum conditions. It is generally composed of three parts: vacuum chamber, vacuum unit and electric control cabinet. The exhaust system adopts “diffusion pump + mechanical pump + Roots pump + low temperature cold trap + Polycold" composition.
The company specializes in the research and development and production of vacuum coating equipment. The experienced technical team and excellent after-sales service team can solve any problems encountered during the use of the equipment. Below, the composition of each part of the vacuum coating machine and its working principle are described in detail.
First, the vacuum body & mdash; — vacuum chamber according to the requirements of processed products, the size of the vacuum chamber is also different, the current application of the largest diameter of 1.3M, 0.9M, 1.5M, 1.8M, etc., the cavity is made of stainless steel The production requires no rust, solidness, etc. Each part of the vacuum chamber has a connecting valve for connecting the pumping pumps.
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Second, the auxiliary pumping system: The exhaust system is an important part of the vacuum system of the coating machine. It mainly consists of three parts: mechanical pump, booster pump (mainly introduced Roots pump) and oil diffusion pump. The exhaust system is composed of "diffusion pump + mechanical pump + Roots pump + low temperature cold trap + polycold".
The exhausting process is as follows: the mechanical pump first draws the vacuum chamber to a low vacuum state of less than about 2.0*10-2PA, which provides a precondition for the subsequent pumping of the diffusion pump. Then, when the diffusion pump draws the vacuum chamber, the mechanical pump cooperates with the oil to diffuse. The pumps are connected in series to complete the pumping action in this manner.
Mechanical pump: also called the fore-stage pump. The mechanical pump is the most widely used low-vacuum pump. It uses oil to maintain the sealing effect and relies on mechanical methods to constantly change the volume of the suction cavity in the pump to make the pumped container. The volume of the internal gas is continuously expanded to obtain a vacuum.
1. Classification of mechanical pumps: There are many kinds of mechanical pumps. Commonly used are slide valve type (this is mainly used for large equipment), piston reciprocating type, fixed piece type and rotary type (this is currently the most widely used, this article mainly introduces) Four types.
2. The mechanical pump starts from the atmosphere. Its main parameters are ultimate vacuum and pumping rate. This is an important basis for designing and selecting mechanical pumps. The single-stage pump draws the vessel from the atmosphere to an ultimate vacuum of 1.0*10-1PA, and the two-stage mechanical pump draws the vessel from the atmosphere to 6.7*10-2 Pa or even higher.
The pumping rate refers to the volume of gas that can be exhausted per unit time when the rotary vane pump is operated at the rated number of revolutions. It can be calculated by the following formula: Sth=2nVs=2nfsL fs indicates the cross-sectional area of the cavity at the end of inhalation, and L indicates empty. The length of the cavity, the coefficient indicates that the rotor has two exhaust processes per revolution, and Vs indicates that when the rotor is in the horizontal position, the inhalation ends, and the volume in the cavity is the largest and the rotational speed is n.
Advantages of vacuum coating machine optical sheet sputter coating
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Advantages of vacuum coating of optical sheet sputter coating, any substance can be sputtered, especially high melting point, low vapor pressure elements and compounds; good adhesion between sputtered film and substrate; vacuum coating machine optical sheet sputtering The density of the coated film is high; the film thickness can be controlled and the repeatability is good.
The rubber has a highly elastic polymer material that is reversibly deformable. It is elastic at room temperature, and can produce large deformation under the action of a small external force, and can be restored to its original state after removing external force. Rubber is a completely amorphous polymer with a low glass transition temperature (T g) and a large molecular weight of more than several hundred thousand.
During the processing, storage and use of rubber and its products, the physical and chemical properties and mechanical properties of rubber are gradually deteriorated due to the combined effects of internal and external factors, and finally the use value is lost. This change is called rubber aging.
The high flow low pressure atomization spray is a low atomization air pressure and a low air jet speed, and the low atomized paint running speed improves the rebound of the paint from the surface of the object to be coated. The painting rate is increased from 30% to 40% of ordinary air spraying to 65% to 85%. In the light leather finishing, the coating is sprayed on the leather surface with a spray gun or a spray gun.
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Why should vacuum coating machines be cleaned? In the past 10 years, the world optical coating industry has continued to develop. In the next 10 years, the military and civilian businesses in this area will rise sharply and become another industrial development trend. At the same time, research on optical coating materials will also become a hot spot. The energy conservation and environmental protection advocated by the future society will also promote the development of optical coating technology. With the advancement and development of science and technology, people's daily life will become increasingly inseparable from the green resource of light energy. The requirements for optical coating materials will also become higher and higher. The research of optical coating materials is still the top priority of coating technology. Therefore, the future development prospects of coating technology are still very large, and we need to work together for it!