For purchasers who usually know little about the vacuum industry, this aspect is almost a blank. However, the general purchase of PVD coating machines is basically coating processing plants, because there are more or less conditions for PVD coating machines and evaporation filming conditions. For some understanding, what are the specific evaporation conditions during the evaporation process of the PVD coating machine, the following Huicheng Vacuum Editor will introduce you in detail, and I hope to help you:

       1) Evaporation characteristics of substances under vacuum conditions
       When the film material is heated to a certain temperature, vaporization will occur, that is, the solid phase or the liquid phase will enter the gas phase. Because the material evaporates under vacuum conditions much easier than under normal pressure, the required evaporation temperature will be greatly reduced , The melting and evaporation process will be greatly shortened, and the evaporation efficiency of vacuum coating equipment will be significantly improved. Take metallic aluminum as an example. Under one atmosphere pressure, aluminum must be heated to 2400°C to evaporate, but if it is heated to 847°C under a vacuum of 10-3Pa, it can evaporate in a large amount.
       2) The evaporation rate of the membrane material
       The evaporation rate of the film material refers to the number of molecules evaporated from the surface of the film material (square centimeter) in the form of steam in a unit time (second).
       3) Collision rate of residual gas on the substrate
       After the film material evaporates, the process of migration and deposition to the substrate is accompanied by continuous collision of residual gas molecules on the substrate. These residual gas molecules, after colliding with the surface of the substrate, are partly reflected into the gaseous space, and partly buried and adsorbed by the deposited film, which is very unfavorable to the formation of the film.
       4) Condensation rate of membrane material
       After the film material is heated and evaporated by a vacuum coating machine, the number of molecules per unit area of the substrate per unit time of the evaporated particles is called the condensation rate of the film material. The condensation rate of vacuum coating equipment is related to the emission characteristics of the evaporation source, the geometry of the source and the substrate, and the distance between the source and the substrate (evaporation distance). Therefore, the design of the coating chamber and the selection of the evaporation source must be closely calculated and fully measured. .
       Guangdong Huicheng Vacuum Technology Co., Ltd. is committed to the development and production of PVD coating machines. PVD coating equipment is widely used in automotive, glass, plastics, electronics, clocks, hardware and other industries. Its products are widely sold worldwide and provide customers with customized process solutions. And PVD coating equipment.