What are the advantages of PVD coating compared with traditional electroplating (water plating)?
PVD basic methods: vacuum evaporation, sputtering, ion plating (hollow cathode ion plating, hot cathode ion plating, arc ion plating, reactive ion plating, radio frequency ion plating, dc discharge ion plating).
Plating (Electroplating) is the use of electrolytic principle in some metal surface on a thin layer of other metal or alloy plating process, is the use of electrolytic action made of metal or other materials adhered on the surface of the parts of a layer of metal film technique to prevent metal oxidation (rust), improve the wear resistance and electric conductivity, reflective resistance, corrosion resistance, copper sulfate, etc.) and improve aesthetics, and so on.
PVD: physical vapor deposition: refers to the process of transferring atoms or molecules from the source to the surface of the substrate by using physical processes. Its function is to enable some particle spraying with special properties (high strength, abrasion resistance, heat dissipation, corrosion resistance, etc.) to be on the matrix with lower performance, so that the matrix has better performance. PVD basic methods: vacuum evaporation, sputtering, ion plating (hollow cathode ion plating, hot cathode ion plating, arc ion plating, reactive ion plating, radio frequency ion plating, dc discharge ion plating).
PVD technology appeared in the prepared films with high hardness, low friction coefficient, good wear resistance and chemical stability.The successful application in the field of high-speed steel cutting tools has attracted great attention from the manufacturing industry around the world. While developing high-performance and highly reliable coating equipment, more in-depth application research has also been carried out in cemented carbide and ceramic cutting tools.Compared with the CVD process, PVD process temperature is low, under 600 ℃ when the bending strength of cutting tool materials;The internal stress state of the film is compressive stress, which is more suitable for the coating of cemented carbide precision complicated tools.PVD process has no adverse effect on environment and is in line with the development direction of modern green manufacturing.Currently, PVD coating technology has been widely used in coating treatment of carbide end milling cutter, drill bit, step drill, oil drilling, reamer, tap, indexable milling cutter sheet, turning blade, special-shaped cutter, welding cutter, etc.
PVD technology not only improved the bonding strength of thin film and tool matrix materials, but also developed the coating composition from the first generation of TiN to multi-composite coating such as TiC, TiCN, ZrN, CrN, MoS2, TiAlN, TiAlCN, tin-aln, CNx, DLC and ta-c.
Electroplating: when electroplating, the coated metal or other insoluble material is used as the anode, and the workpiece to be plated is used as the cathode. In order to eliminate the interference of other cations and make the plating layer uniform and firm, electroplating solution containing metal cations is required to keep the concentration of metal cations unchanged. The purpose of electroplating is to change the properties or dimensions of the surface of a substrate by coating it with metal. Electroplating can enhance the corrosion resistance of the metal (the coating metal mostly USES corrosion-resistant metal), increase the hardness, prevent abrasion, improve the conductivity, smoothness, heat resistance and beautiful surface.
PVD coating and traditional electroplating are similar, both belong to the category of surface treatment, both are to make a certain way to cover the surface of another material. The difference between the two is that PVD coating film layer and the surface of the workpiece have higher binding force, higher hardness of the film layer, better wear resistance and corrosion resistance, and more stable performance of the film layer. PVD coatings can be coated with a wider variety of films, can be plated out of a variety of more beautiful colors; PVD coating does not produce toxic or polluting substances.
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