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Sökning: WFRF:(Hudak O. E.)

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1.
  • Glechner, T., et al. (författare)
  • Influence of the non-metal species on the oxidation kinetics of Hf, HfN, HfC, and HfB2 coatings
  • 2021
  • Ingår i: Materials & design. - : Elsevier. - 0264-1275 .- 1873-4197. ; 211
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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2.
  • Hudak, O. E., et al. (författare)
  • Improved corrosion resistance of cathodic arc evaporated Al0.7Cr0.3_xVxN coatings in NaCl-rich media
  • 2023
  • Ingår i: Corrosion Science. - : Elsevier BV. - 0010-938X .- 1879-0496. ; 221
  • Tidskriftsartikel (refereegranskat)abstract
    • The corrosion resistance of cathodic arc evaporated Al0.7Cr0.3_xVxN coatings with a vanadium content up to 22.3 at% has been electrochemically tested in a 0.1 M NaCl-solution. Significant improvement in the open porosity and corrosion rate was observed for coatings with higher V-contents, due to a denser and more refined coating morphology. Further reduction in the open porosity rate was achieved through an annealing step in air at 700 degrees C. Here, the formation of an AlVO4 top-oxide and underlying oxygen-rich V-depletion zone provides additional sealing of the coating surface, whilst reducing the corrosion current density to a final 1.59 x 10_9 A/cm2.
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  • Resultat 1-2 av 2
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Primetzhofer, Daniel (2)
Wojcik, T. (2)
Ramm, J. (2)
Hunold, O. (2)
Kolozsvari, S. (2)
Riedl, H. (2)
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Hudak, O. E. (2)
Shang, L. (1)
Glechner, T. (1)
Kutrowatz, P. (1)
Polcik, P. (1)
Ntemou, Eleni (1)
Pitthan, Eduardo (1)
Haager, L. (1)
Bohrn, F. (1)
Hutter, H. (1)
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