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

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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SOUČEK Pavel ZÁBRANSKÝ Lukáš BURŠÍKOVÁ Vilma BURŠÍK Jiří DEBNÁROVÁ Stanislava SVOBODA Milan PEŘINA Vratislav VAŠINA Petr

Rok publikování 2018
Druh Článek v odborném periodiku
Časopis / Zdroj Journal of Nanomaterials
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.hindawi.com/journals/jnm/2018/5184584/
Doi http://dx.doi.org/10.1155/2018/5184584
Klíčová slova magnetron sputtering; nanolaminates; mechanical properties
Přiložené soubory
Popis 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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