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Non-reactively sput...
Non-reactively sputtered ultra-high temperature Hf-C and Ta-C coatings
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- Lasfargues, H. (författare)
- TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
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- Glechner, T. (författare)
- TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
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- Koller, C. M. (författare)
- TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
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- Paneta, Valentina (författare)
- Uppsala universitet,Tillämpad kärnfysik
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- Primetzhofer, Daniel (författare)
- Uppsala universitet,Tillämpad kärnfysik
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- Kolozsvari, S. (författare)
- Plansee Composite Mat GmbH, D-86983 Lechbruck, Germany.
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- Holec, D. (författare)
- Univ Leoben, Dept Phys Met & Mat Testing, A-8700 Leoben, Austria.
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- Riedl, H. (författare)
- TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
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- Mayrhofer, P. H. (författare)
- TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
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TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria Tillämpad kärnfysik (creator_code:org_t)
- ELSEVIER SCIENCE SA, 2017
- 2017
- Engelska.
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Ingår i: Surface & Coatings Technology. - : ELSEVIER SCIENCE SA. - 0257-8972 .- 1879-3347. ; 309, s. 436-444
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- HfC
- TaC
- Non-reactive sputter deposition
- Vacancies
- UHTC
- Density Functional Theory (DFT)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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