Synthesis and characterization of novel RE-free permanent magnet materials

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Project abstract

This project aims at the Synthesis and Characterization of Novel rare-earth (RE)-free high performance permanent magnet materials.

The objective is to single out magnetic materials with (BH)max in the interval 100 - 150 kJ/m3, which is much higher than for ferrite and Alnico magnets but lower than for the best rare-earth metal based magnets. This will require that Br of the new materials is close to 1 T and that Hci is found somewhere in the range 0.5 - 1 MA/m. The critical temperature that we target is 600 K or larger.

This kind of novel-magnets could be used in the clean energy field, both in electricity generation and consumption areas: like wind turbine, compact and high energy-efficiency motors, cars, etc.

Summary of work

2015. Some high percentage ferromagnetic tau phase samples of (MnAlC, MnAlB,MnAlGa) have been synthesized, ball milled, and magnetic characterized. The MnAlC ferromagnetic tau phase high temperature thermal stability also have been analyzed. The MnAlC ferromagnetic phase forming condition become more and more clear and under control.

2016. The tau phase MnAlC samples have been cryomilled, and get very fine powders suitable for making good magnets.

2016. A method has been developed that is suitable for industry to make high performance rare earth free permanent magnet MnAl powder.

2017. Further development of microstructural control throuch milling and flash heating has been developed. Knowledge transfer to Höganäs AB on how to produce a high quality material. Initial test on how to produce permanent magnets through aligning and pressing powder in magnetic field has been initiated. This will continue during 2018.

2018. Powder magnetic field aligning and pressing have been tried for several times and got some good results; the pressing process could be further optimized.

Event log

2016-03. Two weeks exchange in IFE (Institution For Energy) Oslo, Norway, to do cryomill and neutron diffraction

2016-09. Attending the conference in Darmstadt of Germany about the "The 24th International Workshop on Rare-Earth and Future Permanent Magnets and Their Applications (REPM 16)" from 28 August to 1 September 2016.

2016-10. Attending the C3/MATsynCELL meeting within the Röntgen-Ångström Cluster in BMC of Uppsala University.

2016-10. Attending the Swegrid Conference hold in Stockholm.

2016-10. Invention disclosure with partner Höganäs.

2017. Successful identification of temperature ranges and compositions for the conversion of MnAlC from the epsilon phase to the tau phase.

2017. The cryomilling procedure in combination with heat treatment is prepared for a patent application by Höganäs AB.

2017. A manuscript on the cryomilling is prepared and submitted for publication.

2017. Hailiang has been visiting the Höganäs labs to initiate test on compacting powder to permanent magnets.

2018. Höganäs AB have applied for a patent together with Uppsala university.

2018. Magnetic field alignment and pressing have been tried several times in Höganäs AB.

2018. Attended the "European powder diffraction conference" held in Edinburgh in July.

2019. Defending PhD thesis no later than end of May 2019.

Project reference-group

Martin Sahlberg,  UU
Larsson Per-Olof,  Höganäs AB
Hilmar Vidarsson,  Höganäs AB
Björn Skårman,  Höganäs AB
Klas Gunnarsson,  UU
Petter Svedlindh,  UU
Olle Eriksson,  UU

Publications by this researcher

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Measured and calculated properties of B-doped τ-phase MnAl : A rare earth free permanent magnet
Sofia Kontos,   Hailiang Fang,   Jiheng Li,   Erna Krisztina Delczeg-Czirjak,   Samrand Shafeie,   Peter Svedlindh,   Martin Sahlberg,   Klas Gunnarsson.
2019,   Journal of Magnetism and Magnetic Materials, vol. 474

Structural Studies of Mn-X (X=Al, Bi): Permanent Magnetic Materials without Rare Earth Metals
Hailiang Fang.
2019,   Thesis (PhD), Acta Universitatis Upsaliensis, Digital 1782

One step towards MnAl-based permanent magnets : Differences in magnetic, and microstructural properties from an intermediate annealing step during synthesis
Samrand Shafeie,   Hailiang Fang,   Daniel Hedlund,   Axel Nyberg,   Peter Svedlindh,   Klas Gunnarsson,   Martin Sahlberg.
2019,   Journal of Solid State Chemistry, vol. 274

Insights into phase transitions and magnetism of MnBi crystals synthesized from self-flux
Hailiang Fang,   Jiheng Li,   Samrand Shafeie,   Daniel Hedlund,   Johan Cedervall,   Fredrik Ekström,   Cesar Pay Gómez,   Jozef Bednarcik,   Peter Svedlindh,   Klas Gunnarsson,   Martin Sahlberg.
2019,   Journal of Alloys and Compounds, vol. 781

Structural, microstructural and magnetic evolution in cryo milled carbon doped MnAl
Hailiang Fang,   Johan Cedervall,   Daniel Hedlund,   Samrand Shafeie,   Stefano Deledda,   Fredrik Olsson,   Linus von Fieandt,   Jozef Bednarcik,   Peter Svedlindh,   Klas Gunnarsson,   Martin Sahlberg.
2018,   Scientific Reports, vol. 8(1)

Insights into formation and stability of tau-MnAlZ(x) (Z = C and B)
Hailiang Fang,   Johan Cedervall,   Francisco Javier Martinez Casado,   Zdenek Matej,   Jozef Bednarcik,   Jonas Ångstrom,   Pedro Berastegui,   Martin Sahlberg.
2017,   Journal of Alloys and Compounds, vol. 692

Directly obtained tau-phase MnAl, a high performance magnetic material for permanent magnets
Hailiang Fang,   Sofia Kontos,   Jonas Ångstrom,   Johan Cedervall,   Peter Svedlindh,   Klas Gunnarsson,   Martin Sahlberg.
2016,   Journal of Solid State Chemistry, vol. 237

Publication list last updated from DiVA on 2024-01-10 15:22.

Page started: 2014-11-01
Last generated: 2024-01-10