CobaltMaghrebV1, France, Analysis, bibRecord, 000022

Spark Plasma Sintering of Co80Ni20 nanopowders synthesized by polyol process and their magnetic and mechanical properties

Identifieur interne : 000022 ( France/Analysis ); précédent : 000021; suivant : 000023

Spark Plasma Sintering of Co80Ni20 nanopowders synthesized by polyol process and their magnetic and mechanical properties

Auteurs : Nassima Ouar [France] ; MOHAMED ALI BOUSNINA [France, Tunisie] ; Frédéric Schoenstein [France] ; Silvana Mercone [France] ; Ovidiu Brinza [France] ; Samir Farhat [France] ; Noureddine Jouini [France]

Source :

Journal of alloys and compounds [ 0925-8388 ] ; 2014.

RBID : Pascal:15-0029209

Descripteurs français

Pascal (Inist)
- Frittage par décharge plasma, Synthèse nanomatériau, Microstructure, Croissance grain, Grosseur grain, Spectrométrie dispersive, Dureté Vickers, Essai compression, Hystérésis magnétique, Force coercitive, Nanopoudre, Alliage base cobalt, Nickel alliage, Nanofil, Nanoparticule, Métal transition alliage.

English descriptors

KwdEn :
- Cobalt base alloys, Coercive force, Compressive testing, Dispersive spectrometry, Grain growth, Grain size, Magnetic hysteresis, Microstructure, Nanomaterial synthesis, Nanoparticles, Nanopowder, Nanowires, Nickel alloys, Spark plasma sintering, Transition element alloys, Vickers hardness.

Abstract

A bottom-up process to elaborate nanostructured cobalt materials is here described. We first, synthesized Co₈₀Ni₂₀ nanowires with a mean length L ˜ 270 nm and a mean diameter d ˜ 7 nm and Co₈₀Ni₂₀ nanospheres with a mean diameter D ˜ 200 nm. This was done by a polyol process in presence of Ruthenium (III) chloride hydrate nucleating agent. Then the as-obtained nanopowders were consolidated by spark plasma sintering (SPS) in order to limit the grain size growth. Nanostructures of powders and of the processed bulk samples were studied and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and field emission gun scanning electron microscope (FEGSEM). Standard VSM measurements were processed for magnetic characterizations. Magnetic static measurements were performed at 10 K and 300 K showing that magnetic properties of nanostructured cobalt bulk systems can be tuned from hard to soft just changing the shape of nano-systems used for compaction and/or the sintering conditions. Also the mechanical properties show a strong dependence on the relative bulk densities and on the characteristics of grain inside the consolidated samples. Preliminary results show that nanostructured cobalt obtained from nanowires compaction present higher Vickers Hardness value.

Affiliations:

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

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to stream Main, to step Exploration: 000192
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Links to Exploration step

Pascal:15-0029209

Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt base alloys</term>
<term>Coercive force</term>
<term>Compressive testing</term>
<term>Dispersive spectrometry</term>
<term>Grain growth</term>
<term>Grain size</term>
<term>Magnetic hysteresis</term>
<term>Microstructure</term>
<term>Nanomaterial synthesis</term>
<term>Nanoparticles</term>
<term>Nanopowder</term>
<term>Nanowires</term>
<term>Nickel alloys</term>
<term>Spark plasma sintering</term>
<term>Transition element alloys</term>
<term>Vickers hardness</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Frittage par décharge plasma</term>
<term>Synthèse nanomatériau</term>
<term>Microstructure</term>
<term>Croissance grain</term>
<term>Grosseur grain</term>
<term>Spectrométrie dispersive</term>
<term>Dureté Vickers</term>
<term>Essai compression</term>
<term>Hystérésis magnétique</term>
<term>Force coercitive</term>
<term>Nanopoudre</term>
<term>Alliage base cobalt</term>
<term>Nickel alliage</term>
<term>Nanofil</term>
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<front><div type="abstract" xml:lang="en">A bottom-up process to elaborate nanostructured cobalt materials is here described. We first, synthesized Co<sub>80</sub>
Ni<sub>20</sub>
 nanowires with a mean length L ˜ 270 nm and a mean diameter d ˜ 7 nm and Co<sub>80</sub>
Ni<sub>20</sub>
 nanospheres with a mean diameter D ˜ 200 nm. This was done by a polyol process in presence of Ruthenium (III) chloride hydrate nucleating agent. Then the as-obtained nanopowders were consolidated by spark plasma sintering (SPS) in order to limit the grain size growth. Nanostructures of powders and of the processed bulk samples were studied and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and field emission gun scanning electron microscope (FEGSEM). Standard VSM measurements were processed for magnetic characterizations. Magnetic static measurements were performed at 10 K and 300 K showing that magnetic properties of nanostructured cobalt bulk systems can be tuned from hard to soft just changing the shape of nano-systems used for compaction and/or the sintering conditions. Also the mechanical properties show a strong dependence on the relative bulk densities and on the characteristics of grain inside the consolidated samples. Preliminary results show that nanostructured cobalt obtained from nanowires compaction present higher Vickers Hardness value.</div>
</front>
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<tree><country name="France"><region name="Île-de-France"><name sortKey="Ouar, Nassima" sort="Ouar, Nassima" uniqKey="Ouar N" first="Nassima" last="Ouar">Nassima Ouar</name>
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<name sortKey="Jouini, Noureddine" sort="Jouini, Noureddine" uniqKey="Jouini N" first="Noureddine" last="Jouini">Noureddine Jouini</name>
<name sortKey="Mercone, Silvana" sort="Mercone, Silvana" uniqKey="Mercone S" first="Silvana" last="Mercone">Silvana Mercone</name>
<name sortKey="Mohamed Ali Bousnina" sort="Mohamed Ali Bousnina" uniqKey="Mohamed Ali Bousnina" last="Mohamed Ali Bousnina">MOHAMED ALI BOUSNINA</name>
<name sortKey="Schoenstein, Frederic" sort="Schoenstein, Frederic" uniqKey="Schoenstein F" first="Frédéric" last="Schoenstein">Frédéric Schoenstein</name>
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Spark Plasma Sintering of Co80Ni20 nanopowders synthesized by polyol process and their magnetic and mechanical properties

Spark Plasma Sintering of Co80Ni20 nanopowders synthesized by polyol process and their magnetic and mechanical properties

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