Publication details

Fracture Resistance Enhancement in Hard Mo-B-C Coatings Tailored by Composition and Microstructure

Authors

SOUČEK Pavel ZÁBRANSKÝ Lukáš BURŠÍKOVÁ Vilma BURŠÍK Jiří DEBNÁROVÁ Stanislava SVOBODA Milan PEŘINA Vratislav VAŠINA Petr

Year of publication 2018
Type Article in Periodical
Magazine / Source Journal of Nanomaterials
MU Faculty or unit

Faculty of Science

Citation
Web https://www.hindawi.com/journals/jnm/2018/5184584/
Doi http://dx.doi.org/10.1155/2018/5184584
Keywords magnetron sputtering; nanolaminates; mechanical properties
Attached files
Description State-of-the-art protective coatings often suffer from brittleness. Therefore, the coatings are intensively sought which would simultaneously exhibit high hardness and stiffness with moderate ductility and fracture resistance. In this paper, we report on the nanostructure designing of coatings containing metal, boron, and carbon enabling the simultaneous presence of stiff boridic and carbidic bonds together with weaker metallic bonds to provide coatings with these desirable properties. Three designs are presented with different relative amounts of nanocrystalline and amorphous phases, ranging from near-amorphous to prevalently crystalline microstructure. All presented coatings exhibit an unusual combination of high fracture resistance and high hardness that cannot be achieved with state-of-the-art protective coatings. Indentation tests at high loads revealed that no cracks are present at the surface of the investigated coatings while state-of-the-art ceramic protective coatings already exhibit significant cracking. Cracks in the bulk of the presented coating are detected only when the deformation is so severe that the substrate itself fails.
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