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Ultra-divided matter, Physical sciences for materials
In a context of significant development of engines and generators based on permanent magnets (hybrid vehicles, wind turbines) and limited raw material resources, it is necessary to reduce the amount of rare earths (TR) present in the NdFeB magnets.The research of new compounds, containing less TR, which could replace the NdFeB permanent magnets while keeping the high magnetic performances of these magnets, is essential. We are currently seeing a renewed interest in the TRFe12 phases known since 1990, which have interesting intrinsic magnetic properties for permanent magnets: saturation magnetization and anisotropy field equal to or even larger than for Nd2Fe14B. However, the work carried out in the scientific community does not make possible to obtain sufficient coercivity to be able to replace the magnets in Nd2Fe14B. The goal of this PhD thesis is: (1) the development of the TRFe12 alloys manufacturing process and sintering conditions; and (2) understanding and developing the coercivity in TRFe12 magnets. The student will use the experimental means of the Poudr'Innov platform of CEA-LITEN as well as those present at the CNRS - Institut Néel for the manufacture of magnets. Magnetic characterizations will be performed using conventional resources (hysteresis measurement, magnetometer at different temperatures) possibly large instruments (ILL).The expected results are: (1) the synthesis of the anisotropic TRFe12 phase, (2) the realization of sintered magnets of TR-Fe12 type by conventional and / or SPS methods, and (3) the understanding of the mechanisms of coercivity in magnets with low TR content.
Département des Technologies des NanoMatériaux (LITEN)
Laboratoire Matériaux Avancés et mise en forme
CEA Grenoble,17 avenue des Martyrs38054 Grenoble cedex
Phone number: 0438782171
Université Grenoble Alpes
Ecole Doctorale de Physique de Grenoble
Start date on 01-10-2019
DE RANGO Patricia
Institut Néel (UPR 2940)
CNRS - Institut Néel25, Rue des MartyrsBP 166 - 38042 Grenoble Cedex 09
Phone number: +33 4 76 88 90 30
« The age limit is 26 years for PhD offers and 30 years old for post-doc offers. »