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Influence of the no...
Influence of the non-metal species on the oxidation kinetics of Hf, HfN, HfC, and HfB2 coatings
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- Glechner, T. (författare)
- TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.
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- Hudak, O. E. (författare)
- TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.
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- Wojcik, T. (författare)
- TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.
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- Haager, L. (författare)
- TU Wien, Inst Chem Technol & Analyt, A-1060 Vienna, Austria.
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- Bohrn, F. (författare)
- TU Wien, Inst Chem Technol & Analyt, A-1060 Vienna, Austria.
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- Hutter, H. (författare)
- TU Wien, Inst Chem Technol & Analyt, A-1060 Vienna, Austria.
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- Hunold, O. (författare)
- Oerlikon Surface Solut AG, Oerlikon Balzers, FL-9496 Balzers, Liechtenstein.
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- Ramm, J. (författare)
- Oerlikon Surface Solut AG, Oerlikon Balzers, FL-9496 Balzers, Liechtenstein.
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- Kolozsvari, S. (författare)
- Plansee Composite Mat GmbH, D-86983 Lechbruck, Germany.
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- Pitthan, Eduardo (författare)
- Uppsala universitet,Tillämpad kärnfysik
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- Primetzhofer, Daniel (författare)
- Uppsala universitet,Tillämpad kärnfysik
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- Riedl, H. (författare)
- TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria.;TU Wien, Inst Mat Sci & Technol, A-1060 Vienna, Austria.
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TU Wien, Christian Doppler Lab Surface Engn High Performan, Vienna, Austria TU Wien, Inst Chem Technol & Analyt, A-1060 Vienna, Austria. (creator_code:org_t)
- Elsevier, 2021
- 2021
- Engelska.
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Ingår i: Materials & design. - : Elsevier. - 0264-1275 .- 1873-4197. ; 211
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- The influence of the non-metal species on the oxidation resistance of transition metal ceramic based thin films is still unclear. For this purpose, we thoroughly investigated the oxide scale formation of a metal (Hf), carbide (HFC0.96), nitride (HfB1.5), and boride (HfB2.3) coating grown by physical vapor deposition. The non-metal species decisively affect the onset temperature of oxidation, ranging between 550 degrees C for HfC0.96 to 840 degrees C for HfN1.5. HfB2.3 and HfN1.5 obtain the slowest oxide scale kinetic following a parabolic law with k(p) values of 4.97.10(-10) and 5.66.10(-11) kg(2) m(-4) s(-1) at 840 degrees C, respectively. A characteristic feature for the oxide scale on Hf coatings, is a columnar morphology and a substantial oxygen inward diffusion. HfC0.96 reveals an ineffective oxycarbide based scale, whereas HfN(1.5 )features a scale with globular HfO2 grains. HfB(2.3 )exhibits a layered scale with a porous boron rich region on top, followed by a highly dense and crystalline HfO2 beneath. Furthermore, HfB(2.3 )presents a hardness of 47.7 +/- 2.7 GPa next to an exceptional low inward diffusion of oxygen during oxidation. This study showcases the strong influence of the non-metallic bonding partner despite the same metallic basis, as well as the huge potential for HfB2 based coatings also for oxidative environments.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- Thin films
- Borides
- Oxide-film growth kinetics
- Oxidation
- Hafnium
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Glechner, T.
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Hudak, O. E.
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Wojcik, T.
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Haager, L.
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Bohrn, F.
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Hutter, H.
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Hunold, O.
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Ramm, J.
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Kolozsvari, S.
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Pitthan, Eduardo
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Primetzhofer, Da ...
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Riedl, H.
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