Application of the hottest anti-corrosion super th

2022-08-06
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Application of anti-corrosion super thick coating on aircraft engines for many years, the typical PVD coating is a very thin super hard wear-resistant film, most of which is applied to cutting tools, such as drill bits, milling cutters, reamers, blades and hobs, and also to various molds. Typical film thicknesses for this application range from 1 to 5 μ M. of course, the film thickness for special applications is close to 10 μ M or so. However, the special application coatings in automobile manufacturing and aerospace have been far more than 5 μ m。 It has been proved that the thicker the coating, the better the wear resistance and corrosion resistance. At present, the ultra thick film layer with this requirement can reach 10~50 μ M, some films are even thicker

at present, 80% of PVD ultra hard layer is deposited by arc evaporation technology. The coating formed by arc evaporation has many excellent advantages, such as high cost performance and good quality; Considering the cost of materials and energy, this technology is the most competitive coating with the lowest investment. In addition, due to the high ionization formed by arc evaporation in vacuum, this technology can also obtain the best bonding force and the densest film

an example of a typical composite nanostructure film with a thickness of about 20 μ M

(from MTU aircraft engine manufacturing company in Munich, Germany)

in the past 10 years, Al based superhard coatings have occupied a particularly important position. Nowadays, most coating manufacturers can provide coatings with various aluminum contents. In addition, Cr based coatings are more and more used. All these coatings are composite coatings. In particular, the composite coating can greatly reduce the internal tension of the film and the droplet size on the surface of the film. In addition, most of these films are nanostructured films, and each single layer is only 20~50nm thick

today, the coating of this structure has become the most advanced coating for protecting aircraft engine components, such as the wear-resistant and corrosion-resistant coating of turbine blades. This super thick film based on Ti and tin with alternating soft and hard is the first generation of anti-corrosion film, which can increase the service life of turbine blades by 2~3 times. At present, these coatings are widely used in very harsh environments, such as helicopter engines in the desert according to his view, but they are also increasingly used in commercial aircraft engines

super thick PVD coating is required in special wear-resistant and corrosion-resistant applications in the aviation industry. In the figure, the aircraft engine blade (integrated blade) with tin coating is shown, and the film thickness is 20 μ m。 In the process of deposition, the process temperature is one of the most decisive parameters affecting the fatigue life of blades. With the deepening of the concept of environmental protection, this super thick coating of tin structure has become the most advanced coating for aircraft engine blades. With the development of coating technology, Al based thickened coating has become the second generation of better engine blade coating

in conclusion, among all PVD coating processes, arc deposition coating technology has become the most economical wear-resistant and corrosion-resistant coating for industrial production. Today, 80% of the PVD superhard coatings in the world are obtained by arc deposition technology. The fact also proves that PVD is the cupping value of the plate. If an insulating film is placed between two layers of ionic conductors, it can reach 10~50 in the most economical way μ M or so. (end)

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