Introduction of resistance evaporation coating process of vacuum coating machine
The resistance evaporation coating process of the evaporation vacuum coating machine is the most traditional coating process. The process is simple, the equipment structure is simple, and the cost is low. However, the scope of the coated workpiece is limited, and the target material is also limited. Only materials with a low melting point can be electroplated. The proportion of applications on the market is still high, and the supply and demand of evaporative vacuum coating equipment on the market is still large every year. The following vacuum editor will introduce the characteristics of vacuum coating machine resistance evaporation coating process in detail from four aspects.
1.The definition of vacuum.
Usually refers to a gas state below one atmosphere. Compared with ordinary atmospheric pressure, the molecular density is thinner, so the collision probability between gas molecules and gas molecules, and gas molecules and container walls is low.
2.The definition of vacuum evaporation coating.
Vacuum evaporation coating is a technology in which the evaporated material is heated by an evaporator and evaporated under vacuum. The evaporated particle stream is directly injected into the substrate and deposited on the substrate to form a solid film. Including thermal evaporation and electron beam evaporation (electron beam evaporation).
3. The main process of vacuum evaporation coating.
1) Various energy sources are converted into heat energy, and the film material is heated and evaporated or sublimated into gas particles (atoms, molecules and atomic groups) with certain energy.
2) After leaving the surface of the film, the gas particles with a considerable velocity are transported to the surface of the substrate in a substantially linear flight without collision.
3) The gas particles reaching the surface of the substrate gather, nucleate and grow into a solid film.
4) The atoms that make up the film are rearranged or chemically combined.
4. The principle and characteristics of thermal evaporation.
Thermal evaporation is a coating technology in which the material to be evaporated is heated to the melting temperature by resistance under vacuum, so that atoms evaporate, reach and adhere to the surface of the substrate.
Features: The resistance evaporation vacuum coating machine is cheap and easy to operate. It is widely used in conductive materials such as gold, silver, copper, nickel, indium, and chromium.
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