Views:10 Author:Site Editor Publish Time: 2017-09-13 Origin:Site
Physical vapor deposition (PVD) is a technology where a material is evaporated and condensed to form a thin film coating over an object (substrate). With a wide range of coating materials and thicknesses, PVD can be customized to applications and the coatings can be optimized for various characteristics, such as decorative, optical, electrical, and mechanical properties.The passage mainly talks about the use of PVD coating in decoration.
PVD coatings can be deposited in a wide range of colors. Typical metal target material in decorative PVD processes are naval brass, bronze, aluminum target, zirconium target, titanium target, chromium target, titanium-aluminum alloys targetand niobium target. The rang of colors can be further enhanced by introducing reactive gases into the chamber during the deposition process.
The most widely used reactive gases for decorative coatings are nitrogen, methane, or acetylene. They produce metal-nitride, metal-carbide and metal-carbon-nitride films. Oxygen can also be used to produce oxides, oxynitrides, etc. The decorative coatings are produced in a certain color range, depending on the metal-to-gas ratio in the coating and the structure of the coating. Both of these factors can be altered by changing the deposition parameters. Process Control The process parameters to deposit each color are stored in software recipes with various different process steps. Prior to deposition, the parts are cleaned so the surface is free of dust or chemical impurities. Once the coating process has started, all the relevant process parameters are continuously monitored and controlled by an automatic computer control system.