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Ti /Ti(V,Zr)N multilayered PVD coatings

Time:2020-07-14 20:51:47  From:  Author:

 

The Ti-6Al-4V alloy is widely used in various industries due to it high specific strength and corrosion resistance. An increased wear I one of the problems of operating parts in gas-turbine plants made of this alloy. The wear leads to the deterioration of characteristics, reduction in the performance reliability and, as a consequence, the decreased service life. The solution to this problem is to prevent the penetration of solid particles from the air-gas flow simultaneously with the use of wear-resistant materials and protective coatings. Both ways require the studies on the mechanics of multiphase environments, materials science and tribology. There are lots of studies dedicated to erosion mechanisms, which are described in works. The best way to increase the erosion resistance is to apply protective coatings on parts. The variety of coating techniques and technological equipment makes this way the most attractive for development of new hardening technologies used for parts working in the erosive environments. One of the advanced technologies in the development of wear resistant coatings is physical vapor deposition (PVD) with arc, magnetron sputtering and electron beam methods. PVD coatings such as nitrides or carbides of transition metals are typically much harder than most steels or specialized alloys and have appreciably lower erosion or wear rates. It has been shown that the use of PVD coatings ensures a very good erosion resistance and also good corrosion resistance for aircraft compressor blades. The detailed study of PVD coatings with a high erosion resistance (based on VN, VC, Cr3C2, ZrN and TiN) demonstrates that the coating of zirconium nitride is the most suitable one for protecting compressor blades of two-phase Ti alloys, and the chromium carbide PVD coating is the best one for steel compressor blades. The (Ti, Al) N coating showed the best properties during both erosion and corrosion tests. It was shown that titanium diboride and titanium aluminium nitrides could be the most promising coatings for compressor blades.

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