CobaltMaghrebV1, Main, Exploration, bibRecord, 000947

Effect of tungsten 0-8 wt.% on the oxidation of Co-Cr alloys

Identifieur interne : 000947 ( Main/Exploration ); précédent : 000946; suivant : 000948

Effect of tungsten 0-8 wt.% on the oxidation of Co-Cr alloys

Auteurs : A. Karaali [Algérie] ; K. Mirouh [Algérie] ; S. Hamamda [Algérie] ; P. Guiraldenq [France]

Source :

Computational materials science [ 0927-0256 ] ; 2005.

RBID : Pascal:05-0183910

Descripteurs français

Pascal (Inist)
- Oxydation, Microstructure, Addition tungstène, Préoxydation, Analyse microsonde électronique, Microscopie électronique balayage, Diffraction RX, Epaisseur, Diffusion(transport), Energie activation, Tungstène oxyde, Cobalt alliage, Chrome alliage, Couche oxyde, Chrome oxyde, Cobalt oxyde, Spinelles, Composé minéral, Métal transition composé, W, Cr O, Cr2O3, 66.
Wicri :
- topic : Composé minéral.

English descriptors

KwdEn :
- Activation energy, Chromium alloys, Chromium oxides, Cobalt alloys, Cobalt oxides, Diffusion, Electron microprobe analysis, Inorganic compounds, Microstructure, Oxidation, Oxide layer, Preoxidation, Scanning electron microscopy, Spinels, Thickness, Transition element compounds, Tungsten additions, Tungsten oxides, XRD.

Abstract

The nature and the morphology of the formed oxide layers at the alloys' surface have great importance on the quality of the ceramic/metal bond. This study shows the effect of the tungsten addition on the formation and the growth of the oxide layers on the Co-Cr alloys in preoxidation temperature range 950-1050 °C, thus including the temperature range of the ceramisation process that these alloys will undergo later. Their characterization, by microprobe analysis, scanning electron microscopy (SEM), spectrography with luminescent discharge (SLD) and low angle X-ray diffraction. reveals the formation of two distinct layers: the first one, from the external surface, is formed only of pure CoO, while the second one is a mixture of Cr₂O₃ particles and cobalt-tungsten oxide dispersed in a CoCr₂O₄ matrix. The tungsten addition up to 8 wt.% modifies considerably the thickness of the formed layers as a consequence of its accumulating in the second layer, thus blocking the cobalt diffusion towards the alloy surface.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The nature and the morphology of the formed oxide layers at the alloys' surface have great importance on the quality of the ceramic/metal bond. This study shows the effect of the tungsten addition on the formation and the growth of the oxide layers on the Co-Cr alloys in preoxidation temperature range 950-1050 °C, thus including the temperature range of the ceramisation process that these alloys will undergo later. Their characterization, by microprobe analysis, scanning electron microscopy (SEM), spectrography with luminescent discharge (SLD) and low angle X-ray diffraction. reveals the formation of two distinct layers: the first one, from the external surface, is formed only of pure CoO, while the second one is a mixture of Cr<sub>2</sub>
O<sub>3</sub>
 particles and cobalt-tungsten oxide dispersed in a CoCr<sub>2</sub>
O<sub>4</sub>
 matrix. The tungsten addition up to 8 wt.% modifies considerably the thickness of the formed layers as a consequence of its accumulating in the second layer, thus blocking the cobalt diffusion towards the alloy surface.</div>
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Effect of tungsten 0-8 wt.% on the oxidation of Co-Cr alloys

Effect of tungsten 0-8 wt.% on the oxidation of Co-Cr alloys

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri