Factors affecting the coating of vacuum coating machine
The parameters affecting the coating of vacuum coating machine are: deposition rate, ion bombardment, vacuum, substrate material, film material, material temperature, evaporation method, and later treatment.
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1. The effect of vacuum:
The effect of vacuum on the properties of the film is very large. Some materials have high requirements on the degree of vacuum. Some materials have low requirements on the degree of vacuum. The higher the degree of vacuum, the smaller the influence of the chemical reaction of the surrounding gas. The vacuum chamber carrying the vacuum environment must ensure that the residual gas does not collide during the process of vapor molecules from the evaporation source to the substrate. If the degree of vacuum is low, the probability of collision of vapor molecules with gas is high, and the kinetic energy of the vapor molecules may be reduced and the substrate may be weak. Adsorption, resulting in poor adhesion of the deposited film layer, the design of the vacuum chamber is very important, absolutely no gas leakage.
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2. Effect of deposition rate:
The deposition rate is expressed as the thickness of the film layer formed on the surface of the substrate per unit time, and the unit is nm/s or A/s, which is reference data indicating the deposition speed. In the same vacuum, the refractive index of the film with different deposition rates is also different. The improvement of the deposition rate can improve the performance of the optical film and improve the adhesion of the film to some extent.
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3. Impact of ion bombardment:
The ion bombardment before coating plays a role in improving the adhesion and cleaning the substrate to some extent. In the case of evaporation coating, ion bombardment generally enhances the chemical reaction and increases the aggregation density of the film layer, thereby making the transmittance of the oxide film. Increase, increase reflectivity, improve hardness and strength.
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4. Effect of substrate temperature:
The substrate temperature mainly affects the mechanism and crystal growth of the film layer, the cohesion coefficient and the optical properties. The high temperature of the substrate helps to increase the refractive index, and also promotes the chemical reaction between the deposited film molecules and the remaining gas molecules. It should be noted that not every substrate can obtain the best effect at high temperatures, which may cause qualitative changes in the film layer.
In the process of coating the film by vacuum coating machine, the influence of film performance is not only affected by the above process parameters, but also there are many detailed parameter processes that affect the final performance and effect of the film. Good adhesion of the film layer is a problem to be noticed in the plating work.
The original text is edited by Baorui Titanium. Please reprint the link: the parameters affecting the coating of the vacuum coating machine.