Publication details

On the study of the mechanical properties of Mo-B-C coatings

Authors

ZÁBRANSKÝ Lukáš BURŠÍKOVÁ Vilma SOUČEK Pavel VAŠINA Petr BURŠÍK Jiří

Year of publication 2016
Type Article in Periodical
Magazine / Source The European Physical Journal - Applied Physics
MU Faculty or unit

Faculty of Science

Citation
Doi http://dx.doi.org/10.1051/epjap/2016150591
Field Plasma physics
Keywords Mo2BC coatings; hardness; fracture resistance
Description Mo2BC thin films show a favourable combination of high stiffness, hardness and elastic modulus together with moderate ductility. In this study we focused on the comparison of mechanical properties of Mo-B-C thin films with different structures (nanocrystalline or amorphous). The thin films were deposited on steel, hard metal and silicon substrates using DC magnetron sputtering. The mechanical properties of Mo-B-C films were studied using indentation techniques under both quasistatic and dynamic conditions using a wide range of loads from 50 mikroN up to 1 N. The results showed that even amorphous Mo-B-C thin films had high hardness of 19.5±0.5 GPa and elastic modulus of 276±5 GPa. Their hardness is comparable with the common amorphous diamond-like carbon coatings. Moreover, their fracture toughness is significantly higher. The results of mechanical tests were correlated with microstructure observations carried out using scanning and transmission electron microscopy. The images of the deformed area under the residual indentation imprints showed no cracking even after high loads or after indentation with sharp cube corner indenter.
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