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

0494654 - ÚFM 2019 RIV GB eng J - Journal Article
Souček, P. - Zábranský, L. - Buršíková, V. - Buršík, Jiří - Debnárová, S. - Svoboda, Milan - Peřina, Vratislav - Vašina, P.
Fracture Resistance Enhancement in Hard Mo-B-C Coatings Tailored by Composition and Microstructure.
Journal of Nanomaterials. Roč. 2018, MARCH (2018), č. článku 5184584. ISSN 1687-4110. E-ISSN 1687-4129
R&D Projects: GA ČR(CZ) GA15-17875S; GA MŠMT(CZ) LM2011019; GA MŠMT LM2015056
Institutional support: RVO:68081723 ; RVO:61389005
Keywords : nanocomposite * ductility * strength
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Nuclear physics (UJF-V)
Impact factor: 2.233, year: 2018

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.
Permanent Link: http://hdl.handle.net/11104/0287786