Email Us neo@atechmagnet.com CALL US NOW +86-010-53345989
Huatai Xinding(Beijing)Metal Materials Co., Ltd.
En
New Development By Korean Scientists:Can NdFeB Magnets Use Less Neodymium?
Magnetic solution
provider & manufacturing expert,
25 years of professional experience
Innovative solutions for sustainable developments toward a better world
Striving for excellence and continuous improvements to support your success

New Development By Korean Scientists:Can NdFeB Magnets Use Less Neodymium?

Grade 42M commercial magnet performance (see graph) can be achieved with ~30% less neodymium than before, according to the Korea Institute of Materials Science. More of the less costly rare-earth cerium is the answer, but performing this substitution has been proving difficult.

“In order to develop a neodymium-reduced permanent magnet, the content of cerium has to be increased,” said KIMS. “Until now, with the increased content of cerium, it was not able to prevent the deterioration of the magnetic properties.”


Part of the reason is that Ce2Fe14B is simply not such a good magnet material as Nd2Fe14B – with 11.7kG and 26kOe for the cerium version against 16kG and 73kOe when neodymium is used.

But another reason is that, above 24% cerium according to the research team, paramagnetic (hardly magnetic) rare-earth-Fe particles form and disrupt the crystal structure desired for strong rare-earth-Fe-B magnets.

Using hot-deformation instead of sintering to form the final magnet shape was known to be part of the answer, as its fast cooling hindered the formation of rare-earth-Fe particles, but it did not deal with rare-earth-Fe particles that had already formed when the precursor powder was made by crystalline melt-spinning.

The critical step at KIMs, was to increase the spinning speed to accelerate cooling in this step too, producing amorphous precursor powder from the same feed material.

The result was no rare-earth-Fe particles in the powder, which was then hot-deformed into the final magnet shape to avoid subsequent rare-earth-Fe particle formation.

The researchers, led by Jung-Goo Lee and Tae-Hoon Kim, “succeeded in optimising the microstructure of the magnet by suppressing the formation of unnecessary magnetic particles”, said KIMS. “In addition, they were able to simultaneously improve the residual magnetism and coercive force, which are the main properties of permanent magnets. As residual magnetism and coercive force are in a trade-off relationship, technology that improves both is very useful.”

The work is covered in ‘High-performance Ce-substituted (Nd0.7Ce0.3)-Fe-B hot-deformed magnets fabricated from amorphous melt-spun powders‘, published in Scripta Materialia – full paper can be read without payment.  
                                                                                                                                                                                                                                                                                                                                                  
Source: https://www.electronicsweekly.com/news/research-news/rare-earth-magnet-uses-less-neodynium-2022-04/
Related News
  • Oklahoma Is To Become Home To A Rare Earth Metal And Manufacturing Facility

    Oklahoma Is To Become Home To A Rare Earth Metal And Manufacturing Facility

    June 17, 2022USA Rare Earth LLC announced Thursday that it plans to invest $100 million into a Stillwater plant that will convert rare earth oxides into metals, magnets and other specialty materials that can be us...view
  • New Electric Motor for Electric Car

    New Electric Motor for Electric Car

    April 6, 2021The upcoming 2022 BMW iX not only uses the 5th generation e-drive technology of the German automaker, but also highlights BMW’s commitment to sustainable manufacturing. The core of the BMW iX electri...view
  • Neodymium Magnets for Electric Vehicles

    Neodymium Magnets for Electric Vehicles

    October 13, 2020Usage of magnetic rare earth in such vehicles is expected to grow from about 2,000 metric tons last year to 7,000 tons by 2020 and 12,000 tons by 2024, according to a presentation from Lynas Corp., th...view
  • Rare Earth Metals production in China

    Rare Earth Metals production in China

    October 13, 2020Rare earth minerals are a suite of 17 elements mineable in the earth's crust, with names such as cerium, europium and lutetium. They are commonly used in everything from car motors and electronics to ...view