What is the characteristics of the extremely high vacuum state of the extremely high vacuum coating machine?
The extremely high vacuum state of the extremely high vacuum coating machine refers to a vacuum environment with a pressure lower than 10⁻⁹Pa. As we all know, physical phenomena in a vacuum environment are closely related to parameters such as the mean free path of the thermal motion of gas molecules and the number density of gas molecules.
In a very high vacuum state, the gas has a very small molecular number density (under normal temperature, it is less than 2X10¹²/m³), and the gas molecules have a particularly long mean free path (usually greater than 6.7X10⁶m, depending on the size of the vacuum chamber of the vacuum coating machine The actual free path of gas molecules is equal to the characteristic size of the vacuum chamber of the coating machine).
Therefore, the physical characteristics of the gas molecules in the extremely high vacuum state of the extremely high PVD vacuum coating machine are completely different from the atmospheric pressure, low vacuum or high vacuum environment. In a very high vacuum state, there is only a very small collision probability between gas molecules, and the gas molecules deviate from the law of motion of Maxwell's velocity distribution law. Although the collision of gas molecules with the wall of the vacuum chamber is the main one, the number of collisions is also very small. Therefore, it takes a long time for gas molecules to form a monomolecular adsorption layer on the surface of the object in contact with the vacuum.
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