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Influence of Electron Beam and Laser Remelting on the Oxidation Behaviour of HVOF-sprayed CoNiCrAlY Coatings

Einfluss von Elektronenstrahl- und Laser-Umschmelzverfahren auf das Oxidationsverhalten von HVOF-gespritzten CoNiCrAlY-Schichten

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Summary

The influence of electron beam and laser remelting on the high temperature oxidation behaviour of HVOF-sprayed MCrAlY coatings is revealed on CoNiCrAlY coatings containing 8 wt.% aluminium. Different test specimens (as sprayed status, electron beam remelted and laser remelted) were oxidized under the same conditions (at 950 °C for 168 hours in synthetic air). After oxidation, the structures of the coatings were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), in order to point out the effects on the oxidation behaviour obtained by the two remelting methods applied on the coatings.

Zusammenfassung

Der Einfluss von Elektronenstrahl- und Laser-Umschmelzverfahren auf das Hochtemperaturoxidationsverhalten von HVOF-gespritzten MCrAlY-Schichten wird anhand von CoNiCrAlY-Schichten mit 8 Gew.% Aluminium veranschaulicht. Verschiedene Testproben (im gespritzten Zustand und im umgeschmolzenen Zustand, nach Anwendung von Elektronenstrahl- und Laser-Behandlungen) wurden unter den gleichen Bedingungen oxidiert (bei 950 °C für 168 Stunden in synthetischer Luft). Nach der Oxidation wurde der Aufbau der Schichten mit Hilfe der Rasterelektronenmikroskopie (REM) und Röntgendiffraktometrie (XRD) untersucht, um den Einfluss der zwei Umschmelzmethoden auf das Oxidationsverhalten der Schichten zu erfassen.

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Authors and Affiliations

  1. Fachhochschule Gelsenkirchen, Neidenburger Straße 10, 45877, Gelsenkirchen, Germany

    G. Marginean

  2. Universität "Eftimie Murgu" Reşiţa, P-ţa Traian Vuia 1-4, 320085, Reşiţa, Romania

    Doina Frunzăverde

  3. Fachhochschule Gelsenkirchen, Neidenburger Straße 10, 45877, Gelsenkirchen, Germany

    D. Utu

  4. S.C. UCMR S.A., Str. Golului 1, 320053, Reşiţa, Romania

    R. Crîsta

  5. Fachhochschule Gelsenkirchen, Neidenburger Straße 10, 45877, Gelsenkirchen, Germany

    W. Brandl

Authors
  1. G. Marginean
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  2. Doina Frunzăverde
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  3. D. Utu
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  4. R. Crîsta
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  5. W. Brandl
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Correspondence to G. Marginean.

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Marginean, G., Frunzăverde, D., Utu, D. et al. Influence of Electron Beam and Laser Remelting on the Oxidation Behaviour of HVOF-sprayed CoNiCrAlY Coatings. Berg Huettenmaenn Monatsh 152, 32–38 (2007). https://doi.org/10.1007/s00501-006-0269-2

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  • DOI: https://doi.org/10.1007/s00501-006-0269-2

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