Thermal stability of hard nanocomposite Mo-B-C coatings

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Authors

ZÁBRANSKÝ Lukáš BURŠÍKOVÁ Vilma SOUČEK Pavel VAŠINA Petr DUGÁČEK Ján SŤAHEL Pavel BURŠÍK Jiří SVOBODA Milan PEŘINA Vratislav

Year of publication 2017
Type Article in Periodical
Magazine / Source Vacuum
MU Faculty or unit

Faculty of Science

Citation
Web http://ac.els-cdn.com/S0042207X16310119/1-s2.0-S0042207X16310119-main.pdf?_tid=f6f3b316-f801-11e6-ad84-00000aacb35e&acdnat=1487659980_fc74dc58709a11efcd48240fc605b585
Doi http://dx.doi.org/10.1016/j.vacuum.2016.12.016
Field Plasma physics
Keywords Thermal stability; Mo2BC coatings; Hardness; Fracture resistance
Description In the present work, nanocomposite Mo-B-C coatings were deposited on high speed steel and hard metal substrates by magnetron sputtering of three targets. These coatings were subjected to annealing to final temperatures in the range from 500 °C to 1000 °C. It was found that the as deposited Mo-B-C coatings exhibited hardness of ~20 GPa, nanocomposite microstructure with very fine grains (~2 nm) and low degree of crystallinity. The X-ray diffraction and transmission electron microscopy together with selective area electron diffraction were used to study the temperature induced changes of the micro-structure of the coating and its crystallinity. The annealing process significantly improved the hardness (from ~20 GPa to ~30 GPa) and effective elastic modulus (from initial 330 GPa -500 GPa) of coatings while their resistance to fracture was kept sufficiently high.
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