Notices of Tungsten Boat for Vacuum Coating

During vacuum coating, people often do not pay attention to some details which would lead to an unsuccessful coating. Compared to other industries, vacuum deposition is a very environmentally friendly technology for its lower electromagnetic radiation. In addition, it doesn’t have great impact on human bodies. Therefore, the operator should work in more details to improve the efficiency of vacuum deposition.

The first is to pay more attention to the maintenance of working environment of vacuum deposition. Make sure that the substrate surface of it was cleaned before. To reach purpose of deoiling, decontamination and dewatering of the workpiece. In the process of machining a workpiece, transport and packaging, various dusts, lubricants, polishing paste, oil, sweat, etc. would adhere to the substrate surface. Under humid conditions, the materials on surface will form an oxide film. If this happens, it can be removed through deoiling or chemically cleaning method. If there is no surface cleaning treatment, it cannot be placed in the atmosphere. Users should use a closed container or cleaning cabinet to keep it which can reduce dust pollution. For the highly unstable and sensitive to water vapor surface, it is better to be stored in a vacuum oven.

In addition to the maintenance of the environment, operators should regulate their operations. At the time of opening the vacuum deposition machine, operators should turn on the water carrier firstly and observe the water pressure uninterruptedly. When the ion bombardment and evaporation, high voltage cable cannot be touched in case of electric shock. In order to prevent human body from X rays, operators would better wear the lead glass during the observation. During plating the dielectric multilayer film coating, ventilated vacuum devices should be installed to remove harmful dust in time. After working, don’t forget to turn off the power and disconnect water source. In the whole process, operators must wear full protection and cleaning sheath.

Tungsten boat is important resistive evaporation source for vacuum deposition, and due to the different types of it, it is better to choose the corresponding type to coat. More importantly, tungsten boat's surface cannot have any cracks, keeping smooth and flat. Provided that there is some trouble of it which should be changed to a new one immediately. Clearing the dust of the coating indoor, setting the high cleanliness of the workplace, keeping the high cleanliness are the basic requirements of the coating process on the environment.

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