Reference : UPR3407-SALBAR-001
Nombre de Postes : 1
Workplace : VILLETANEUSE
Date of publication : Monday, January 23, 2023
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 March 2023
Proportion of work : Full time
Remuneration : between 2889 and 4082€ gross per month
Desired level of education : PhD
Experience required : Indifferent
The scientific and technical investigations targeted by this project is subscribed in the framework of the valorisation of permanent magnet particles from end-of-life products (EoL). The aim is to develop new magnets using processes with less environmental impact compared to conventional metallurgical production from mining resources. We will use the commercially available micrometric powders of NdFeB EoL magnets and to disperse them in a matrix of thermoplastic polymers, ideally bio-sourced. The resulting composites are then extruded into filament to produce new polymer-bonded magnets, also known as recycled plastic magnets (RPM), under magnetic field conditions, in order to optimise their magnetic performance without mechanical strength loss. This project has two parts of investigation. Firstly, we will seek to design NdFeB particle composites obtained from end-of-life magnets. For this, the development of a suitable surface engineering is required. This is based on the functionalization of the magnetic particles by ligands with a good affinity with the polymer chains. Several aspects will of course be studied, in particular the influence of volume fraction of particles on the mechanical strength and magnetic properties during the production of the filament by extrusion. Then, the process of elaboration by FDM under field will be optimized to shape directly functional APr. The technological challenge will be to optimise the technical parameters of the development. This investigation will of course be completed by experimental characterisation campaigns (measurement of magnetisation, density, XRD, SEM, etc.) and mechanical tests.
The candidate will be in charge of several activities:
- Formulation of magnetic composites: Characterisation of NdFeB particles, chemical surface functionalisation of particles, formulation and characterisation of polymer matrix composites
- Manufacture of magnetic filament for printing Spinning of the composites on a benchtop extruder and its characterisation
- 3D printing of the recycled plastic magnet Optimisation of the printing of composite filaments, out of magnetic field and then under magnetic field
- Microstructural, mechanical and magnetic characterisation: by mechanical tests (traction and ultrasound) and magnetic measurements of the printed samples
The candidate should have a strong background in materials science, particularly in composite chemistry, with skills in physics (magnetism) and solid mechanics. He/she should have an interest in experimental work and in the mechanical, chemical and physical characterization of solid materials. Knowledge of plastic extrusion techniques and 3D printing will be appreciated. He/she should be autonomous, organized and have good synthesis and analysis skills. Good English proficiency is necessary for discussions with industrial partners.
Workplace: This position will be shared between the LSPM laboratories of Sorbonne Paris Nord University and the ITODYS laboratory of Paris Cité University. Therefore, the candidate will carry out his/her research between the two structures on a regular basis.
Constraints and risks
No constraints to mention
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