Evaporation pvd coating machine is the most conventional coating machine, and its daily application can be seen everywhere. For example, our daily tableware, home furnishing, decorative parts and decorations, etc., almost all use the evaporation coating process. Because the evaporation coating process is mature, it is necessary to manufacture evaporation There are also many manufacturers of pvd coating machines, and the cost is relatively lower than other types of vacuum coating machines. The following Xiaobian will introduce the principle and process of the evaporation of the evaporation vacuum coating machine in detail.

      1. The principle of resistive evaporation plating
      The principle of resistance evaporation plating of pvd coating machine: it is the process of sublimation (evaporation) through the resistance heat generated by the current passing through the tungsten stranded wire to realize the transformation of solid substances into liquid and then to the boiling point.
       2. Adjustment method
       The resistance evaporation coating of the pvd coating machine is divided into three steps: preheating section, pre-dissolving section and linear evaporation section. However, these three steps are closely related to the length of time and the magnitude of the current. I think that the medium current for a short time, the small current for a long time, and the evaporation current increase linearly as the usual method for adjusting the process, such as the same current time It will turn yellow when it is one-half long, and it will turn black after a long time. If the film thickness of pvd coating machine is too thick, it will also bring a little black, but it is metallic black. The thin film layer is white silver.
       ①. Phenomenon in the preheating section: There is basically no change in the tungsten wire in the furnace body in the preheating section, but the tungsten wire is heated first with a current of a certain ampere. The usual process current is between 600A-1000A and the time is 10-30 seconds.
       ②. Phenomenon of pre-dissolving section: At this time, the tungsten wire in the furnace will glow, and then the aluminum wire will act like a burst, and then it will slowly change from solid state to liquid state. The usual process current is between 800A-1200A and the time is 5-15 seconds.
       3. Linear evaporation section: This stage is the most important. The film layer of the Evaporation pvd coating machine turns black and yellow in this stage. When evaporating, all the tungsten filaments in the furnace are as bright as a 60-watt light bulb (figuratively speaking). ), as the current increases, it will become brighter and brighter. The aluminum wire hangs upside down on the tungsten wire like water droplets at the beginning, and will be completely evaporated as the current increases. (The temperature in the tungsten stranded wire loop also increases continuously with the increase of the current.) The usual process current increases linearly between 1200A-2700A, and the time is within 10 seconds.