Under the condition of high vacuum, the high-purity coating metal (such as aluminum) will fly away and settle on the surface of the workpiece after evaporation at high temperature to form a coating. Argon is a protective gas to prevent oxidation reaction from affecting coating quality.
What is the use of argon in the electroplating process?
Argon does not participate in the reaction, but only increases the gas pressure to improve the discharge conditions of the target during coating. Argon is not used for coating, but is mainly used to create the coating environment. Nitrogen and argon are inert gases. After being flushed in, oxygen can be eliminated and oxidation can be prevented. Secondly, the content ratio of nitrogen and argon in the diffusion pump is different, and different colors can be coated. The main purpose is to change the color of the coated products
How to control the flow of argon in the vacuum coating industry?
If the gas used to adjust the pressure during coating is argon, I think it is as follows: if argon is only used to adjust the pressure, the primary pressure can be ignored, but the secondary pressure should be less than 0.5 atmospheres. Nitrogen is the same, mainly because if it is too large, the pressure in the vacuum chamber will change too sharply, resulting in errors. If the ion source is used, the argon gas inflow should not be too large, which will lead to excessive ion quantity and burn the parts. The pressure is no different from that above.
Any solid material will dissolve and absorb some gas in the atmospheric environment. When the material is placed in the vacuum state, it will be released due to desorption and analysis. The rate of outgassing is proportional to the gas content in the material. The gas composition and the temperature and time of analysis are different for different materials.
The pumping rate of different components of gas by various pumps is also different. When vacuuming, the atmosphere in the container is evacuated first (this part of the gas is quickly evacuated, and the gas in the furnace is basically exhausted at 10-1pa), then the gas desorbed from the surface of the material, the gas diffused from the inside of the material to the surface, and the gas infiltrated into the vacuum through the vessel wall Therefore, after the goods enter the furnace, heat preservation and degassing shall be carried out. Because the goods will absorb some impurity gases before entering the furnace, we shall use appropriate heating to make these gases analyze and desorb the surface of the goods. Taking stainless steel as an example, in addition to the gas adsorbed on its surface, some gas will be released from the steel during the continuous heating and insulation process. The presence of these gases often has a great impact on the purity and color of the film and the adhesion of the film.