National Physical Laboratory

Additive manufacturing of recycled NdFeB magnets

With a question mark still hovering over the security of the supply of heavy rare earths, the REProMag project aims to provide an alternative supply chain by recycling NdFeB magnets using a hydrogen decrepitation process developed at the University of Birmingham.

REProMag logo

The European collaboration seeks to use the resulting powders sparingly, fabricating net-shape magnetic components through additive manufacturing using metal injection moulding and 3D printing. These techniques are able to produce the intricate component geometries required and offer significant reductions in material waste.

One year on and the project is already delivering permanent magnets that are characterised at NPL using a combination of measurement techniques, including the 50 mm bore Pulsed Field Magnetometer, which is needed to accommodate the challenging component geometries. This has led to an extensive investigation of the correction factors used, such as self-demagnetisation and magnetic viscosity, the results of which will be presented in August by Nicholas Hillier at the forthcoming International Workshop on Rare-Earth and Future Permanent Magnets and Their Applications (REPM 16), to be held in Darmstadt, Germany.

A summary of REProMag's recent progress and an interview with one of the project partners, Dr Allan Walton, Head of the Magnetic Materials Group at Birmingham, can be found in the six-monthly newsletter.

Read the second issue (May 2016) of the REProMag Newsletter

Find out more about the REProMag project

For further information, please contact Stuart Harmon

Last Updated: 11 Sep 2017
Created: 2 Jun 2016

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