Ceramic magnetic raw materials

After the products have been dried, a very accurate sintering process takes place, whereby the products acquire the required mechanical and magnetic properties. Before delivery of the products, they are finished off according to the customer’s required product specification. The material is to a large extent corrosion resistant and is even unable to be damaged by weak acids, oil and solvents etc. In the interest of environment protection the use of strontium based materials is preferred to barium, which is a heavy metal and can adversely affect the environment through inexpert use. Owing to its hardness, the material has to be worked using diamond tools. The magnetic properties remain constant within a wide temperature range of (-40 up to 250° C). In high temperatures the magnetic force will decrease. This is temporary however, for when the temperature returns to the normal level, the magnetic force will also return undiminished (reversible temperature curve). When however, ceramic magnets are subjected to extremely low temperatures, the magnetic force will remain diminished (irreversible loss). Above a temperature of about 400 ° C (Curie temperature), the material will become completely de-magnetised so on return to normal temperature it will need to be re-magnetised. Used under normal conditions, the magnetic properties of ceramic magnets can be guaranteed tor life.

The application area for ceramic magnets is vast. Owing to the good price-quality mix ceramic magnets are used in many industrial and household applications. The most occurring types of ceramic magnetic materials are anisotropic strontium and isotropic barium. This last mentioned material is without doubt the favourite tor “low-cost” applications.