Hot formed magnets are produced by thermo-mechanically deforming rare-earth magnetic materials under controlled temperature and pressure. This process creates a highly dense, anisotropic microstructure which results in strong magnetic properties and unique high corrosion resistance. This all without the use of heavy rare-earth like Dysprosium.
What are hot formed neodymium NdFeB magnets?
Hot formed neodymium (NdFeB) radially oriented ring and anisotropic block magnets are produced by a unique hot press - extrusion process. This hot formed process is also called MQ3. As base nanocrystalline powder material is used made by rapid quenching (jet casting) neodymium alloys. This powder material is cold pressed, hot pressed and hot extruded into ring-shaped magnets or into block shape magnets.
During this advanced hot extrusion process the orientation (anisotropy) is created mechanically. This means the orientation of the crystal grains is done without using any external electromagnetic field. Resulting in a full-dense, nanocrystalline structure which supports the stability of the magnetic properties.
The advantages of hot formed neodymium NdFeb magnets
Due to the unique nanocrystalline structure of the grains a substantially lower amount of heavy rare earth material like dysprosium (Dy) and/or terbium (Tb) is used compared to sintered NdFeB magnets to reach same coercivity level. At the moment our main focus is on heavy rare earth free magnet technology.
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Heavy rare earth free (like Dy free) magnets can be made even with high coercivity level.
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In case of ring magnet, it’s making the assembly much easier (1 piece only).
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Various magnetization patterns possible (multi-pole to uni-pole, various skew angles) by the design of magnetizing fixtures.
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Precise magnetization waveform control (f.e. rectangular, trapezoidal, sinusoidal) for high power or low cogging.
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Precise pole transition due to nanocrystalline structure.
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Excellent corrosion resistance due to the absence of internal porosity (full dense material).
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Ring magnets with very small outer diameter are possible (due to mechanical orientation and no need to electrical coils).
Material structure comparison
The pictures show the structure of sintered neodymium (NdFeB) magnet and the nanocrystalline structure of hot formed neodymium (NdFeB) magnet. The nanocrystalline structure gives the hot formed neodymium (NdFeB) magnets their unique advantages as mentioned above. The nanocrystalline structure is created by jet casting (rapid quenching) which makes the magnetic powder. This powder is used in the hot formed process to produce the magnets.
Material performance and magnet shapes that push boundaries
Continuous development is ongoing to increase the coercivity further without using heavy rare earth like dysprosium (Dy) and/or terbium (Tb). Also developments to increase the Br are ongoing.
Also new shapes are developed or under development. Arc shape will go in mass production beginning of 2026.
Ring
Radial
Plate
Parallel
Arc
Radial
Breadloaf
Radial/concentrate
Fan
Pole
Our magnet applications
Our advanced permanent magnet technologies offer solutions for a wide range of performance requirements. Hot formed magnet technology provides high strength and efficiency. Plastic bonded magnet technology offers design flexibility and consistent quality for complex shapes. SmCo magnet technology delivers stable performance in high-temperature and demanding environments. Together these technologies support reliable, efficient and innovative applications across modern industries.
