High temperature oxidation protection of Ni-based materials via fluorine implantation


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Figure 1a, b: SEM images of an untreated (a, left) and fluorine implanted (b, right) Ni sample after high temperature exposure (900°C/120 h/air)

Period: 2018-01-01 to 2020-10-31
Partner: Helmholtz-Zentrum Dresden-Rossendorf
Funder: Federal Ministry for Economics and Energy (BMWI, Germany) via AiF
Project Manager: Dr. Alexander Donchev
Research Group: High Temperature Materials

Conventional Ni-based alloys form a chromia layer (Cr2O3) during high temperature exposure in oxidizing environments. This chromia layer suffers from some disadvantages, e.g. reactions with water vapour. This can lead to chromia depletion in the surface zone. These disadvantages can be avoided by applying a protective alumina layer (α-Al2O3). This layer can be generated via the so called “fluorine effect”. Therefore fluorine implantation is performed on several technical Ni alloys. This technique influences only a very narrow surface zone so that the overall properties are not affected. High temperature oxidation tests have shown that a multi-layered oxide scale with an outer chromia layer and internal alumina formation which was found on the untreated materials (Fig. 1a) can be suppressed by an optimized fluorine implantation treatment. The treated specimens reveal a thin outer alumina layer after high temperature exposure (Fig. 1b).


Das IGF-Vorhaben Nr. 19656BG der Forschungsvereinigung DECHEMA e.V., Theodor-Heuss-Allee 25, 60486 Frankfurt am Main wurde über die AiF im Rahmen des Programms zur Förderung der industriellen Gemeinschaftsforschung (IGF) vom Bundesministerium für Wirtschaft und Energie aufgrund eines Beschlusses des Deutschen Bundestages gefördert.

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