Raw Material Preparation:

The manufacturing of ferrite magnets begins with the preparation of raw materials, which primarily include:

• Iron Oxide (Fe2O3): This serves as the main magnetic component.
• Barium Carbonate (BaCO3) or Strontium Carbonate (SrCO3): These ceramic compounds act as fluxing agents that promote bonding and improve magnetic properties.
• Other Additives: Small amounts of additives such as cobalt oxide (CoO), manganese oxide (MnO), and zinc oxide (ZnO) may be added to enhance specific magnetic characteristics.

Manufacturing Process:

Ferrite magnets are manufactured using powder technology techniques. The primary raw material – ferrite – is made by using iron oxide and strontium carbonate. These materials are mixed together and then elevated in temperature to 1000 - 1200°C. At this temperature they undergo a chemical conversion and the resulting material is ferrite.

The ferrite material is then reduced to a very small particle size by wet milling. The milled powder is then either dried (for dry pressed material) or injected into a die (in wet slurry form) in a large hydraulic press. The die is non-magnetic steel with carbide liners. The die cavities are the shape of the part to be pressed. 

The wet powder (slurry) is then compacted in the presence of a magnetic field. The water allows the flat ferrite particle to more easily align itself in the magnetic field. Most of the water is removed during the compaction process. The remaining water is evaporated during the initial stages of the sintering process. The sintering takes place at 1300°C. approximately. After sintering the material is fully dense and ready for finish grinding to customer specifications. As the material is very hard and brittle, all of the grinding of ceramic magnets is done using diamond wheels.

Quality Control:

Throughout the manufacturing process, diligent quality control measures are implemented to monitor the composition, dimensions, and magnetic properties of the ferrite magnets. This includes testing for magnetic strength, coercivity, and dimensional accuracy to ensure that the magnets meet the specified performance standards.