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The Influence of Oxide Color on the Surface Characteristics of Zirconium Alloy ZrNb₇ (wt%) After Different Heat Treatments

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005880
URN to cite this document: urn:nbn:de:bvb:703-epub-5880-3

Title data

Mosbacher, Mike ; Holzinger, Markus ; Galetz, Mathias ; Glatzel, Uwe:
The Influence of Oxide Color on the Surface Characteristics of Zirconium Alloy ZrNb₇ (wt%) After Different Heat Treatments.
In: Oxidation of Metals. Vol. 95 (2021) Issue 5 . - pp. 377-388.
ISSN 1573-4889
DOI der Verlagsversion: https://doi.org/10.1007/s11085-021-10030-1

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Abstract

Oxidized zirconium alloys can appear as black, white and all gray shades depending on the heat treatment process. The black color results from a high amount of oxygen vacancies in non-stoichiometric zirconia (ZrO₂−ₓ) that effectively reduces the band gap of the material. In this work we compare the surface properties of black and white zirconia on ZrNb₇ substrate. An oxidation in air at 600 °C for 1 h results in a dark-gray oxide with only a few micro cracks. Oxidation at low oxygen partial pressure at 600 °C for 8 h (pO₂ = 10⁻¹⁹ Pa) generates a dense, totally black oxide scale. A three step heat treatment process, that was introduced for better coating adhesion, results in a white oxide layer with many micro cracks parallel to the surface. From the results of various microscopy and spectroscopy techniques, we derive a model of the layer formation of zirconia on ZrNb₇ and give reason why black zirconia, and therefore the oxidation at low oxygen partial pressure, is favorable for tribological applications (e.g., artificial joint replacements).

Further data

Item Type: Article in a journal
Keywords: Oxidized zirconium; Oxide color; Oxygen vacancies; Surface properties
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Metals and Alloys > Chair Metals and Alloys - Univ.-Prof. Dr.-Ing. Uwe Glatzel
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Metals and Alloys
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5880-3
Date Deposited: 29 Oct 2021 10:00
Last Modified: 29 Oct 2021 10:00
URI: https://epub.uni-bayreuth.de/id/eprint/5880

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