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Nanocomposite coatings based on Ti-N-Cr/Ni-Cr-B-Si-Fe, gained by two technologies

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Author(s): N.K. Erdybayeva

Journal: Journal of Nano- and Electronic Physics
ISSN 2077-6772

Volume: 1;
Issue: 4;
Date: 2009;
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Keywords: Nanocomposites | Plasma-Detonation Coating | Plasma Flow | Vacuum Arc Deposition | Elastic Modulus | Plasticity Index | Corrosion Resistance

ABSTRACT
The first results of manufacturing and investigations of a new type of nanocomposite protective coatings are presented. They were manufactured using a combination of two technologies: plasma-detonation coating deposition with the help of plasma jets and thin coating vacuum-arc deposition. We investigated structure, morphology, physical and mechanical properties of the coatings of 80-90 μm thickness, as well as defined the hardness, elastic Young modulus and their corrosion resistance in different media. Grain dimensions of the nanocomposite coatings on Ti-N-Cr base varied from 2.8 to 4 nm. The following phases and compounds formed as a result of plasma interaction with the thick coating surface were found in the coatings: Ti-N-Cr (200), (220), y-Ni3-Fe, a hexagonal Cr2-Ti, Fe3-Ni, (Fe, Ni)N and the following Ti-Ni compounds: Ti2Ni, Ni3Ti, Ni4Ti, etc. We also found that the nanocomposite coating microhardness increased to H = 31.6 ± 1.1 GPa. The Young elastic modulus was determined to be E = 319 ± 27 GPa – it was derived from the loading-unloading curves. The protective coating demonstrated the increased corrosion resistance in acidic and alkaline media in comparison with that of the stainless steel substrate.
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