Correlation between fracture characteristics and valence electron concentration of sputtered Hf-C-N based thin films

Glechner, T. (author): TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.

Lang, S. (author): TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.

Hahn, R. (author): TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.

Moraes, V (author): TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.

Ramm, J. (author): Oerlikon Surface Solut AG, Oerlikon Balzers, FL-9496 Balzers, Liechtenstein.

Kolozsvari, S. (author): Plansee Composite Mat GmbH, D-86983 Lechbruck, Germany.

Riedl, H. (author): TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.;TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.

TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria Univ Leoben, Dept Mat Sci, Leoben, Austria. (creator_code:org_t)

Elsevier BV, 2020
2020
English.
In: Surface & Coatings Technology. - : Elsevier BV. - 0257-8972 .- 1879-3347. ; 399

Related links:: https://doi.org/10.1...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

Hard protective coating materials based on transition metal nitrides and carbides typically suffer from limited fracture tolerance. To further tune these properties non-metal alloying - substituting C with N - has been proven favorable for magnetron sputtered Hf-C-N based thin films. A theoretically predicted increase in valence electron concentration (from 8.0 to 9.0 e/f.u. from Hf-C to Hf-N) through nitrogen alloying lead to an increase in fracture toughness (K-IC obtained during in-situ SEM cantilever bending) from 1.89 +/- 0.15 to 2.33 +/- 0.18 MPa.m(1/2) for Hf0.43C0.57 to Hf0.35C0.30N0.35, respectively. The hardness remains close to the super-hard regime with values of 37.8 +/- 2.1 to 39.9 +/- 2.7 GPa for these specific compositions. Already the addition of small amounts of nitrogen, while sputtering a ceramic Hf-C target, leads to a drastic increase of nitrogen on the non-metallic sublattice for fcc single phased structured HfC1-xNx films, where x = N/(C + N). The here obtained results also provide experimental proof for the correlation between fracture characteristics and valence electron concentration.

By the author/editor: Glechner, T.; Lang, S.; Hahn, R.; Alfreider, M.; Moraes, V; Primetzhofer, Da ...; show more...; Ramm, J.; Kolozsvari, S.; Kiener, D.; Riedl, H.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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