Characterization and Measurement of Vacuum and Vacuum State of Vacuum Silver Plating

Characterization and Measurement of Vacuum and Vacuum State of Vacuum Silver Plating

The word vacuum comes from the ancient Greek and means "nothingness". However, matter exists objectively, and a vacuum can only exist relative to the atmosphere, which is a space with a lower pressure than the atmosphere. Currently, vacuum is defined in vacuum science as "a state of a rarefied gas below one standard atmospheric pressure". If the vacuum is mistaken for the space where no matter exists, that is, the so-called absolute vacuum, it is wrong.

There are generally only two kinds of vacuum states, namely the "natural vacuum" existing in the universe and the "artificial vacuum" obtained by people by means of pumping. In the vacuum coating equipment, the vacuum in the vacuum chamber engaged in the coating process belongs to the latter.

Vacuum silver plating can prepare 30um thick film

Because ion bombardment can increase the density of the membrane and improve the tissue structure of the membrane, the uniformity of the membrane layer is good, the coating layer is dense, and the pinholes and bubbles are less. Therefore, the film quality is improved. The deposition rate is high, the film forming speed is fast, and the thick film of 30um can be prepared.

Coverability of vacuum silver coating

Ion plating results in good diffraction properties. At higher pressures (≥1 Pa) the ions or molecules of the ionized vapor will encounter multiple collisions of gas molecules on their way to the substrate. Therefore, the film particles can be scattered around the substrate. Thus, the coverage of the film layer is improved. Moreover, the ionized film particles will also be deposited on any position on the surface of the substrate with negative voltage under the action of the electric field. Therefore, this point of evaporation plating cannot be achieved.

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