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Postdoctoral position in New Rare Earth Poor Magnet Phase, NdFe11 H/F


Détail de l'offre

Informations générales

Entité de rattachement

Le Commissariat à l'énergie atomique et aux énergies alternatives (CEA) est un organisme public de recherche.

Acteur majeur de la recherche, du développement et de l'innovation, le CEA intervient dans le cadre de ses quatre missions :
. la défense et la sécurité
. l'énergie nucléaire (fission et fusion)
. la recherche technologique pour l'industrie
. la recherche fondamentale (sciences de la matière et sciences de la vie).

Avec ses 16000 salariés -techniciens, ingénieurs, chercheurs, et personnel en soutien à la recherche- le CEA participe à de nombreux projets de collaboration aux côtés de ses partenaires académiques et industriels.  

Référence

2022-22812  

Description de l'unité

The French Alternative Energies and Atomic Energy Commission (CEA) is a public research body, engaged in collaborative projects with leading academic and industrial partners from around the world. It is a key player in research, development and innovation in four main areas:
• defence and security,
• low carbon energies (nuclear and renewable energies),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Located in Grenoble, CEA-LITEN, with a staff of 800 people and a portfolio of 1,100 international patents, is a major research institute spearheading the EU's efforts to limit dependency on fossil fuels and reduce greenhouse gas emissions in three key areas: renewable energy, energy efficiency/storage, and development of materials. CEA-Liten is the only European research institute to span the entire value chain from the development of materials to pilot manufacturing.
With more than 12 years experiences, LITEN is working on magnetic materials for various applications, in cooperation with the industrial partners as well as academic instituts.

Description du poste

Domaine

Matériaux, physique du solide

Contrat

Post-doctorat

Intitulé de l'offre

Postdoctoral position in New Rare Earth Poor Magnet Phase, NdFe11 H/F

Sujet de stage

Postdoctoral position : Lean-Rare Earth Magnetic materials
Domain : Powder metallurgy, Magnetic Materials

Durée du contrat (en mois)

24 mois

Description de l'offre

The energy transition will lead to a very strong growth in the demand for rare earths (RE) over the next decade, especially for the elements (Nd, Pr) and (Dy, Tb). These RE, classified as critical materials, are used almost exclusively to produce NdFeB permanent magnets, and constitute 30% of their mass.

Several recent international studies, aiming to identify new alloys with low RE content and comparable performances to the dense magnetic phase Nd2Fe14B, put hard magnetic compounds of RE-Fe12 type as advantageous substitution solutions, allowing to reduce more that 35% of the amount of RE, while keeping the intrinsic magnetic properties close to those of the Nd2Fe14B composition.

The industrial developments of the RE-Fe12 alloys cannot yet be considered due to the important technological and scientific challenge that remain to be lifted in order to be able to produce dense magnets with resistance to demagnetization sufficient for current applications (coercivity Hc > 800 kA/m).

The aims of the post-doctoral work is to develop Nd-Fe12 based alloys with optimized intrinsic magnetic properties and to master the sintering of the powders in order to obtain dense magnets with coercivity beyond 800 kA/m, to fulfil the requirements of the applications in electric mobility. Two technological and scientific challenges are identified:

-          understanding of the role of secondary phases on the coercivity. This will open the way to the implementation of techniques called "grain boundary engineering", well known for the NdFeB magnets to have remarkably improved the resistance to demagnetization.

-          mastering the sintering step of these powders at low temperature (< 600°C) in order to avoid the decomposotion of the magnetic phase  by grain boundary engineering  

-           

During your 2 years Postdoctoral position, you will be in charge of :

- leading an experimental study on a 1:12 nitrided magnetic phase to maximize the magneto-crystalline anisotropy (Ha > 7T).

- determine the process parameters allowing to densify the powders. The SPS (Spark Plasma Sintering) technology will be used for sintering experiments at a temperature below the stability limit of the nitrided phase. The additional elements  will be investigated to promote the formation of low melting point eutectics with Nd, facilitating the densification. Microstructural characterizations of the alloys and magnets will be performed by XRD, SEM and eventually TEM

 

- with the support of permanent staff, carrying out Micromagnetics Calculations to estimate  the coercivity by the grain boundaries engineering,

-  in collaboration with electric machines manufacturers, evaluate the possibility to use the obtained magnets for various electric machines or for  compact sensors.

The post-doctoral student should promote the results, in particular through publications in peer-reviewed journals and in patents.

Profil du candidat

You have a thesis in the field of the materials and you have a solid experience in the material processing and the (XRD, DTA, TGA, SEM, EDS) .

 You are looking to gain new professional experience after your PhD and thus acquire additional skills. 

Your knowledge and experiences in some or all of the following fields should be an advantage:

·         Powder metallurgy

·         Magnetism

·         micromagnetic simulations

You are recognized for your rigor, your organization, your communication abilities, your open minded, your autonomy, your critical mind and persevering. You know how to work with respect of quality and safety procedures.

Mastering of  written and spoken English is mandatory..

Your application should contain a brief description of your PhD thesis, a list of publication and some recommendations.

Localisation du poste

Site

Grenoble

Localisation du poste

France, Auvergne-Rhône-Alpes, Isère (38)

Ville

Grenoble

Critères candidat

Langues

  • Anglais (Courant)
  • Français (Courant)

Diplôme préparé

Autre

Formation recommandée

a thesis in the field of the materials

Possibilité de poursuite en thèse

Non

Demandeur

Disponibilité du poste

05/12/2022