[cold water machine] intermediate frequency vacuum coating machine is generally equipped with a cold water machine as a coating machine (mainly cylindrical target) cooling equipment. So what is the role of cold water in the process of vacuum coating or coating equipment?
The working principle of vacuum coating is that the film is evaporated on the surface of the workpiece at high temperature. Because air molecules on evaporation and membrane resistance caused by collisions make crystals become rough without light, so the production must be under high vacuum to make fine crystalline light, if the vacuum degree is not high, the crystal will lose luster and binding force is very poor.
[low temperature cold water machine] early vacuum coating is to rely on evaporation natural scattering, combined with poor efficiency low gloss difference. Now with the medium frequency magnetron sputtering target for magnetron target shooting will accelerate the evaporation film molecular bombardment of the target under the electric field, sputtered target atoms, a neutral target atoms (or molecules) deposited on a substrate by film, solve the past natural evaporation can not be processed by the film body varieties. Such as titanium zirconium coating etc..
If the equipment must be added cooling water, because of its high frequency current. When the current flows in the conductor, there is a skin effect, the charge will be gathered in the conductance of the surface area, so that the heat conduction so the use of the middle of the pipe as a conductor in the middle of the water cooling.
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