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Non-reactively sput...
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Lasfargues, H.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
(författare)
Non-reactively sputtered ultra-high temperature Hf-C and Ta-C coatings
- Artikel/kapitelEngelska2017
Förlag, utgivningsår, omfång ...
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ELSEVIER SCIENCE SA,2017
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LIBRIS-ID:oai:DiVA.org:uu-319134
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-319134URI
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https://doi.org/10.1016/j.surfcoat.2016.11.073DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Glechner, T.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
(författare)
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Koller, C. M.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
(författare)
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Paneta, ValentinaUppsala universitet,Tillämpad kärnfysik(Swepub:uu)valpa412
(författare)
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Primetzhofer, DanielUppsala universitet,Tillämpad kärnfysik(Swepub:uu)danpr521
(författare)
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Kolozsvari, S.Plansee Composite Mat GmbH, D-86983 Lechbruck, Germany.
(författare)
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Holec, D.Univ Leoben, Dept Phys Met & Mat Testing, A-8700 Leoben, Austria.
(författare)
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Riedl, H.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
(författare)
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Mayrhofer, P. H.TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
(författare)
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TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.Tillämpad kärnfysik
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Surface & Coatings Technology: ELSEVIER SCIENCE SA309, s. 436-4440257-89721879-3347
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