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Structures and properties of hard and superhard nanocomposite coatingsa Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Vernadsky blvd. 36, Kyiv, 03680, Ukraine b V.N. Karazin Khar'kov National University, pl. Svobody 4, Khar'kov, 61077, Ukraine Various approaches to creating multicomponent nanocomposite coatings of high and superhigh hardness (from $\simeq$ 30 to 100 — 120 GPa) are reviewed with particular emphasis placed on mechanisms underlying the increase in hardness in thin ≤ 10 μm) coatings. The deposition technologies considered include magnetron sputtering, ion beam-assisted and vacuum arc depositions. A classification of hard and superhard coatings with high thermal stability is given. Possible applications of such nanostructured coatings are discussed and prospects for the field are outlined.
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