Ceramic Magnets (Hard Ferrite)
are composed of barium or strontium, which were developed in the early
1960's as an alternative to the more expensive metallic magnets.
This class of magnet is very hard, brittle and possesses lower
energy characteristics compared to other magnetic materials.
However, it is very popular and widely used because of its excellent
resistance to demagnetisation, corrosion, and the advantageous
pricing. Ferrite magnets are manufactured by pressing,
sintering, or injection moulding. These magnets can be both
anisotropic and isotropic. Anisotropic grades are oriented during the
manufacturing process and must be magnetised in the direction of
orientation. Isotropic grades are not oriented and can be magnetised
in any direction.
Applications of Ceramic Magnets
- Speaker Magnets
- DC brushless motors
- Magnetic Resonance Imaging (MRI)
- Magnetos used on lawnmowers and outboard motors
- DC permanent magnet motors (used in cars)
- Separators (separate ferrous material from non-ferrous)
- Used in magnetic assemblies for lifting, holding, retrieving