Authors:
Martin Bram (Forschunsgzentrum Jülich GmbH, Germany)
Monica Keszler (Forschunsgzentrum Jülich GmbH, Germany)
Iliya Radulov (Fraunhofer IWKS, Germany)
Semih Ener (Technical University Darmstadt, Germany)
Fernando Maccari (Technical University Darmstadt, Germany)
Oliver Gutfleisch (Technical University Darmstadt, Germany)
Olivier Guillon (Forschunsgzentrum Jülich GmbH, Germany)
Abstract:
Field assisted sintering technology|spark plasma sintering (FAST|SPS) is an attractive alternative method for the processing of magnet materials starting from the respective powders. Combination of direct Joule heating in a conductive die and the application of uniaxial pressure enables controlled densification of magnet materials with short cycle times. We develop non-conventional modes of FAST|SPS operation specifically adapted to magnet materials including hot deformation of pre-sintered compacts – also known as spark plasma texturing (SPT) – and high-pressure FAST|SPS. The potential of SPT will be demonstrated on the example of a commercial melt-spun Nd-Fe-B powder. High-pressure FAST|SPS is also applied to processing of rare-earth free MnAl magnets. We present preliminary results of densifying a MnAl powder at moderate temperatures up to 600°C and pressures up to 1000 MPa. Advantages, boundary conditions and challenges of both methods will be discussed and compared with conventional processing.
DOI:
https://doi.org/10.59499/EP256772784
