There are many and complex steps in the film coating process of the vacuum coating machine. During the coating process, it is affected by many parameters. What are the specific factors? The main parameters affecting the vacuum coating machine are: deposition rate, ion bombardment, vacuum degree, substrate material, film material, material temperature, evaporation method, post treatment, etc.

1. Impact of vacuum degree:
The vacuum degree has a significant impact on the performance of thin films. Some materials have high requirements for vacuum degree, while others have low requirements for vacuum degree. The higher the vacuum degree, the smaller the impact of surrounding gas chemical reactions. The vacuum chamber carrying the vacuum environment must ensure that the remaining gas does not collide during the process of steam molecules from the evaporation source to the substrate. If the vacuum degree is low, the probability of steam molecules colliding with the gas is high, and the kinetic energy of steam molecules may be reduced, which may be unable to adsorb with the substrate, resulting in poor solidity of the deposited film layer. The design of the vacuum chamber is very important and must not cause air leakage.

2. Impact of sedimentation rate:
The deposition rate is a representation of the thickness of the film layer formed on the substrate surface per unit time, expressed in nm/s or A/s. It is a reference data indicating the rate of deposition. Within the same vacuum degree, the refractive index of films with different deposition rates also varies. Increasing the deposition rate can improve the performance of optical films and enhance the adhesion of the film layer to a certain extent.

3. Effects of ion bombardment:
The ion bombardment before coating to a certain extent plays a role in improving adhesion and cleaning the substrate. Taking evaporation coating as an example, ion bombardment can generally enhance chemical reactions and increase the aggregation density of the film layer, thereby increasing the transmittance, reflectivity, hardness, and strength of the oxide film.

4. Effect of substrate temperature:
The temperature of the substrate mainly affects the structure of the film layer and the growth of crystals, condensation coefficient, and optical properties. The high temperature of the substrate helps to improve the refractive index and can also promote the chemical reaction between the deposited film material molecules and the remaining gas molecules. It should be noted that not every substrate can achieve the best results at high temperatures, which may cause qualitative changes in the film layer.

In the process of film coating by vacuum coating machine, the influence of film performance is not only affected by the above process parameters, but also by many detailed parameters. The process will affect the final performance and effect of the film. Only by doing well in each link can the adhesion of the film be better improved. This is a problem that should be noticed in the process of coating. No matter which link has problems in the process of coating, the probability of high-quality products will be affected, Therefore, it is crucial to pay special attention to every aspect.