In the vacuum coating industry, diffusion pump oil plays an extremely critical role, and its unique properties provide indispensable support for the coating process.
Diffusion pump oil is mainly used in oil diffusion pumps, which generate oil vapor by heating, and these vapors are ejected at high speed. Due to the high-speed movement of oil vapor and the collision with the pumped gas molecules, the gas molecules can be effectively taken away to realize the pumping process, thereby creating the required high vacuum environment for vacuum coating. In this process, the characteristics of diffusion pump oil are fully demonstrated.
High vacuum is an important requirement for vacuum coating. Diffusion pump oil has an extremely low saturated vapor pressure, which makes it produce very little gas when it evaporates at high temperature, which can help the diffusion pump reach an extreme vacuum of 10⁻⁴ to 10⁻⁵Pa or even higher, meeting the stringent requirements of precision coating for high vacuum environment, ensuring that there is almost no other gas interference during the coating process, and improving the purity and quality of the film layer.
Diffusion pump oil can achieve high pumping speed. Its molecular weight is large, and the oil vapor jet formed has a high flow rate and high vapor density. When the pumped gas molecules enter the oil vapor jet area, they can easily obtain the momentum of downward movement and be quickly taken to the outlet to be pumped away by the front pump. A larger pumping speed means that the gas in the vacuum chamber can be pumped out in a shorter time, which improves the efficiency of coating and meets the demand for efficient operation in industrial production.
When facing impurities such as dust that may be generated during the coating process, some diffusion pump oils have good anti-pollution ability. Even if a small amount of impurities are mixed in, its chemical stability can still ensure that the performance does not decrease significantly during long-term use, and there is no need for frequent replacement, which reduces maintenance costs and downtime, and ensures the continuity of coating production.
Diffusion pump oil plays a key role in the vacuum coating industry with its high vacuum, high pumping speed and anti-pollution characteristics. It is of great significance to improve coating quality, increase production efficiency and reduce production costs. It is an important factor in promoting the continuous development of vacuum coating technology.