In the coating process, vacuum degree is a crucial parameter that directly affects the quality and performance of the coating. The following is the impact of vacuum degree on coating quality:

Reduce the influence of gas molecules: In a vacuum environment, the number of gas molecules is significantly reduced, which reduces the interference of gas molecules on coating materials. Under low vacuum conditions, gas molecules may interact with coating materials, affecting the growth and uniformity of thin films.

Improve deposition rate: In vacuum, coating materials can be deposited onto the substrate more quickly because gas molecules do not hinder the movement and deposition of the material.

Improving film quality: Vacuum environment helps reduce the introduction of impurities and particles, thereby improving the purity and uniformity of the film. This is particularly important for applications that require high optical clarity or specific electrical properties.

Reduce chemical reactions: In vacuum, the rate of chemical reactions usually decreases, which helps to control the chemical composition and structure of the film.

Impact on film structure: Vacuum degree can affect the lattice structure of the film. Under high vacuum conditions, the film may form a denser lattice, while low vacuum conditions may lead to the formation of more pores or defects in the film.

Control the deposition process: Different vacuum levels are suitable for different coating techniques. For example, sputtering coating is usually carried out at lower pressures, while evaporation coating may be carried out under high or ultra-high vacuum.

Affects the adhesion of the film: Vacuum environment helps to improve the adhesion between the film and the substrate by reducing the interference of moisture and other gases.

Impact on cost and efficiency: Vacuum degree can also affect the cost and efficiency of coating. High vacuum levels typically require more complex equipment and longer pumping times, which may increase costs and prolong production cycles.

Therefore, in the coating process, it is necessary to precisely control the vacuum degree to ensure the acquisition of high-quality films. Different types of coating technologies have different requirements for vacuum degree, and it is necessary to choose the appropriate vacuum degree according to specific applications and processes.