Nanocomposite and nanostructured superhard Ti-Si-B-N coatings |
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Authors: | A D Korotaev D P Borisov V Yu Moshkov S V Ovchinnikov K V Oskomov Yu P Pinzhin V M Savostikov A N Tymentsev |
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Institution: | (1) Tomsk State University, Russia;(2) V. D. Kuznetsov Sibetian Physical Technical Institute of Tomsk State University, Russia;(3) Tekhnotron State Organization, Russia;(4) Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, Russia;(5) Institute of High Current Electronics of the Siberian Branch of the Russian Academy of Sciences, Russia |
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Abstract: | Electron microscopy, x-ray diffraction analysis, and micro-and nanohardness measurements were used to investigate the interrelations
between the fine structure and the variations in strength properties of nanostructured and nanocomposite Ti-Si-B-N coatings with high oxygen and carbon contents. It has been shown that under the conditions of low-temperature (T = 200°C)
coating deposition, a two-level grain structure forms with {200} texture and grains 0.1–0.3 μm in size fragmented into subgrains
15–20 nm in size. As the silicon content is increased, textureless coatings with the crystal phase grain size less than 15
nm and high amorphous component or coatings of amorphous-crystalline structure are produced. At coating deposition temperatures
of 400–450°C, a nanocomposite structure with a grain size d = 10–15 nm and no texture is observed. For all test compositions
and conditions of coating production, a Ti
1−x
Si
x
N crystal phase with the lattice parameter a = (0.416–0.420) ± 0.001 nm has been detected. For optimum coating compositions
and synthesis conditions, the hardness is over 40–50 GPa. It has been supposed that superhardness can be attained with multiphase
grain-boundary interlayers of thickness more than 1 nm.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 13–23, October, 2007. |
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