How Magnets Are Made

The Rare Earth Magnets Production Process

1. Raw Materials
   Materials used in manufacturing sintered Rare Earth Magnets include several alloy compositions consisting primarily of neodymium, iron and boron.
2. Milling
   The coarse powdery materials are then jet-milled into an average particle size of about 3 microns.
3. Power Blending
   Milled power is blended to achieve a highly precise composition. The material is at risk of oxidation during this stage, and must be maintained in an inert gas atmosphere, such as argon.
4. Pressing & Magnetising
   NdFeB is an anistropic material: it produces maximum magnetic output when all the particles are lined up magnetically during compaction. An aligning magnetic field is applied when pressing the powder. The material can be pressed isostatically, transversely (perpendicular) or axially (parallel). 
5. Sintering & Heat Treating
   The ingredients are sintered at temperature in excess of 1000ºC to achieve 99% density. When sintering, the magnet will shrink by almost a fifth of its original size! They are cooled and then heat-treated to six hundred degrees, before being rapidly cooled again to room temperature.
6. Finishing Process
   Uncontrolled distortion may occur during sintering, and so a "clean-up" takes place by grinding the magnet into the exact measurements. Finishing touches are added last, such as the addition of a glossy nickel or gold protective coating, re-magnetising and marking polarity.
7. Quality Control & Shipping
   The final product is put through rigid inspection and testing to ensure utmost quality. From our Victoria headquarters our magnets are shipping to our customer across Australia and all around the world!