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<div class="csl-entry">Glechner, T., Hudak, O. E., Wojcik, T., Haager, L., Bohrn, F., Hutter, H., Hunold, O., Ramm, J., Kolozsvári, S., Pitthan, E., Primetzhofer, D., & Riedl-Tragenreif, H. (2021). Influence of the non-metal species on the oxidation kinetics of Hf, HfN, HfC, and HfB2 coatings. <i>Materials & Design</i>, <i>211</i>, 1–12. https://doi.org/10.1016/j.matdes.2021.110136</div>
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dc.identifier.issn
0264-1275
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/20594
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dc.description.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 (HfN1.5), and boride (HfB2.3) coating grown by physical vapor deposition. The non-metal species decisively affect the onset temperature of oxidation, ranging between 550 °C for HfC0.96 to 840 °C for HfN1.5. HfB2.3 and HfN1.5 obtain the slowest oxide scale kinetic following a parabolic law with kp values of 4.97∙10-10 and 5.66∙10-11 kg2 m-4 s−1 at 840 °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 HfN1.5 features a scale with globular HfO2 grains. HfB2.3 exhibits a layered scale with a porous boron rich region on top, followed by a highly dense and crystalline HfO2 beneath. Furthermore, HfB2.3 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.
en
dc.language.iso
en
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dc.publisher
ELSEVIER SCI LTD
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dc.relation.ispartof
Materials & Design
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dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
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dc.subject
borides
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dc.subject
Hafnium
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dc.subject
oxidation
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dc.subject
Oxide-film growth kinetics
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dc.subject
thin films
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dc.title
Influence of the non-metal species on the oxidation kinetics of Hf, HfN, HfC, and HfB2 coatings