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How are Magnets Made?
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Last Updated
26th of March, 2012




   


1. RAW MATERIALS
Minerals - such as Neodymium, Iron and Boron - are sourced from all around the world.
Many required elements, such as Neodymium, are very uncommon and newver found on their own. They must be heavily refined & processed before the material is useable!





2. MILLING & BLENDING

 

   

The course materials are jet-milled down into powder, which is then blended into an incredibly precise composition.
At this point the powder is in danger of oxidation, and must be kept in an inert gas, such as Argon!





   


3. PRESSING
The mixture is compacted into shape and a magnetic field is appled to ensure all particles are aligned... this maximises magnetic output!







4. SINTERING

  


The ingredients are sintered at temperatures in excess of 1,000°c to achieve 99% density.
During this process, the magnet will shrink by nearly a fifth of its size! They are rapidly cooled, then re-heated to 600°c before being cooled again.





  

5. FINISHING
A "clean-up" takes place by sanding the magnet into exact measurements. Finishing touches are added last.
Finishing touches may include the addition of a glossy nickel protective coating, re-magnetising, and marking polarity.




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