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  • Lasfargues, H.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria. (author)

Non-reactively sputtered ultra-high temperature Hf-C and Ta-C coatings

  • Article/chapterEnglish2017

Publisher, publication year, extent ...

  • ELSEVIER SCIENCE SA,2017
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-319134
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-319134URI
  • https://doi.org/10.1016/j.surfcoat.2016.11.073DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Transition metal carbides are known for their exceptional thermal stability and mechanical properties, notably governed by the carbon content and the prevalent vacancies on the non-metallic sublattice. However, when using reactive deposition techniques, the formation of amorphous C-containing phases is often observed. Here, we show that non-reactive magnetron sputtering of HfC0.89 or TaC0.92 targets lead to fully crystalline coatings. Their C content depends on the target-to-substrate alignment and globally increases from HfC0.66 to HfC0.76 and from TaC0.69 to TaC0.75 with increasing bias potential from floating to - 100 V, respectively, when using a substrate temperature T-sub of 500 degrees C. Increasing T-sub to 700 degrees C leads to variations from TaC0.71 to TaC0.81. All HfCy films are single-phase face-centered cubic, whereas the TaCy films also contain small fractions of the hexagonal Ta2C phase. The highest hardness and indentation modulus among all coatings studied is obtained for TaC0.75 with H = 41.9 +/- 03 GPa and E = 466.8 +/- 15 GPa. Ab initio calculations predict an easy formation of vacancies on the C-sublattice, especially in the Ta-C system, and a temperature driven stabilization of defected structures at high temperatures, with fewer vacancies on the C sublattice for Hf-C than for Ta-C The predicted phase stability is proven up to 2400 C for both systems by annealing experiments in vacuum.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Glechner, T.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria. (author)
  • Koller, C. M.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria. (author)
  • Paneta, ValentinaUppsala universitet,Tillämpad kärnfysik(Swepub:uu)valpa412 (author)
  • Primetzhofer, DanielUppsala universitet,Tillämpad kärnfysik(Swepub:uu)danpr521 (author)
  • Kolozsvari, S.Plansee Composite Mat GmbH, D-86983 Lechbruck, Germany. (author)
  • Holec, D.Univ Leoben, Dept Phys Met & Mat Testing, A-8700 Leoben, Austria. (author)
  • Riedl, H.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria. (author)
  • Mayrhofer, P. H.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria. (author)
  • TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.Tillämpad kärnfysik (creator_code:org_t)

Related titles

  • In:Surface & Coatings Technology: ELSEVIER SCIENCE SA309, s. 436-4440257-89721879-3347

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