Permanent magnets from Arelec Solution
Raw permanent magnets are manufactured by sintering. Sintering is a parts manufacturing process that involves compressing and heating a powder with a specific magnetic alloy.
Our range of
permanent magnets.
High-performance raw permanent magnets are magnetic alloys (NdFeB, SmCo, AlNiCo or Ferrite). Obtained by sintering, after machining and magnetization, these magnets are used in a wide variety of demanding industrial sectors: automotive, aeronautics, electronics and renewable energies.
These magnets can be bonded, embedded or overmolded. They are also available in a wide range of shapes and sizes, with different typical load capacities.
Ferrite magnets.
These magnets can be used in high-temperature environments, up to 250°C. Their price is very attractive. Ferrite magnets are also highly resistant to corrosion, so no surface treatment is required. Belonging to the ceramic family, they are extremely hard and fragile to shocks.
Neodymium magnets.
The neodymium magnets are among the strongest available. Its operating temperature can reach at least 80°C, and some models can be used in environments up to 180°C. These magnets are made from an alloy, and require surface treatment against corrosion (zinc plating, nickel plating, epoxy).
Samarium-cobalt magnets.
Samarium-cobalt permanent magnets combine excellent resistance to demagnetization with high corrosion stability, eliminating the need for surface treatment. They are suitable for demanding and long-term applications, particularly in harsh conditions, and can reliably operate at temperatures of up to 300°C.
Innovation and precision :
the manufacture of permanent magnets.
These different stages enable the production of permanent magnets suitable for various industrial applications.
Powder preparation
Material selection – The process begins with the selection of suitable metal powders. Typically, sintered permanent magnets are made from materials such as ferrite (iron oxide), NdFeB (neodymium-iron-boron), SmCo (samarium-cobalt).
Powder mixing – The powders are then mixed with binding agents, and sometimes other additives, to ensure the cohesion and fluidity of the mixture. This stage is crucial to the quality of the final magnet.
Compression
The powder mixture is then compacted in a mould under high pressure to form a preform of the part. This stage gives the magnet its shape, but the part is still relatively fragile at this stage.
Density control – The density of the preform is essential as it will affect the magnetic and mechanical properties of the final magnet.
Sintering
Heating – The compacted preform is then heated in a furnace to a temperature close to the melting point of the materials. The sintering process allows the powders to partially fuse without completely melting, forming a homogeneous solid.
Hardening – Sintering increases the density of the magnet and gives it its magnetic and mechanical properties. For some materials, such as NdFeB, specific sintering conditions are required to achieve optimum performance.
Cooling
After sintering, the parts are cooled slowly to avoid cracks or deformation caused by sudden temperature changes.
Machining
Cutting and finishing – Once cooled, sintered parts are often machined to the final size and shape.
Polishing and cleaning – After machining, magnets can be polished and cleaned to remove surface residues and impurities.
Coating (optional)
Sometimes a coating (such as nickel, zinc or another material) is applied to sintered magnets to avoid corrosion.
Magnetisation
Application of the magnetic field – Once the magnet has been manufactured, it is magnetised by exposing the parts to a very strong magnetic field. This orients the magnetic domains in a specific direction so that the permanent magnet acquires its full magnetic strength.
Controlling the direction of the magnetic field – Depending on the type of magnet, the magnetic domains must be aligned in a particular orientation.
Discover our other ranges of
magnetic solutions.
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fasteners.
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closures & counter-plates.
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elastomers.
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display solutions.
Magnetic
Workshop tools.
Magnets for the
construction industry.
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