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What are the steps in the PVD coating process?
Release time:
2022-03-14
Before the PVD coating process, the machine requires color removal, spraying, polishing, passivation, cleaning, and clamping. Coating process, vacuum extraction, heating and baking, leak testing, bombardment cleaning, coating, and post-cooling process: First, the cleaning process ensures the cleanliness of the product surface before PVD coating. The fresher the surface, the better the coating quality.
Today, we will provide a detailed introduction to PVD Coating Machine The steps involved in the coating process, their order, details, and principles.
Before the PVD coating machine processing, it needs to go through color removal, spraying, polishing, passivation, cleaning, and clamping. Coating process, vacuum extraction, heating and baking, leak test, bombardment cleaning, coating, and post-cooling process: First, the cleaning process ensures the cleanliness of the product surface before PVD coating. The fresher the surface, the better the coating quality. Then, vacuum is applied to remove residual gas from the vacuum chamber. Next, heating and baking are performed, simultaneously heating the furnace and workpiece to accelerate the release of remaining gas. The pressure rise rate tests the leak rate and gas resistance of the furnace. Bombardment cleaning removes debris from the workpiece surface, exposing a fresh surface. Coating, deposition of the film layer. Cooling prevents the workpiece from oxidizing and discoloring.
How is the cooling of the PVD coating machine performed?
1. High valve closed, vacuum gauge closed, vacuum chamber isolated from the pump group.
2. When the operator presses the N2 vent button, pre-connected nitrogen gas is filled into the vacuum chamber through the N2 expansion valve. When the pressure in the vacuum chamber reaches the preset pressure of the pressure switch, the N2 expansion valve closes.
3. The vacuum chamber is filled with a large amount of N2. The low vacuum is more conducive to heat conduction, so the cooling speed is much faster than without N2 cooling, the cooling time is shortened, and productivity is improved. The actual cooling time may be shortened from the original 90 minutes to 60 minutes.
4. Helium has a high thermal conductivity, so helium cooling is faster than nitrogen cooling, but it is also more expensive.
5. The rapid cooling procedure of foreign equipment can shorten the cooling time by 50% through the circulation cooling of the cooling gas.
Why perform a rise rate test?
The vacuum environment conditions of the PVD coating machine are an important factor affecting the coating quality. Before coating, a pressure rise rate test must be performed to ensure that the vacuum environment conditions meet the coating standards.
How to perform a rise rate test?
In our automatic coating process, the pressure rise rate test is performed automatically. After the vacuum degree in the vacuum chamber reaches the background vacuum set by the process, it will Enter the pressure rise rate test phase.
The PVD coating machine system automatically closes the high valve, at which point the vacuum chamber is isolated from the pump group, and the vacuum chamber pressure increases. If the pressure does not exceed the set alarm value within a certain time (usually 1 minute), the next procedure will automatically proceed, Entering the coating stage. When the pressure exceeds the set alarm value, a warning prompt will appear. At this time, the operator must re-evacuate, heat, and then repeat the rise rate test according to the operating procedure until the rise rate meets the coating conditions of the PVD coating machine.
The above is an introduction to PVD Coating Machine The steps involved in the coating process. For more information, please Contact Us!
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Qingdao Wanruitong Vacuum Technology Co., Ltd
Tel: +86-15092098313
Tel: +86-15606393362
E-mail: 330314385@qq.com
Address: South of 204 National Road, Jiaozhou City, Qingdao City, Shandong Province
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