Ferrite magnet is a kind of permanent magnet that made from iron oxide and barium or strontium carbonate by ceramic processing technology. So it's also called as ceramic magnet.
Special maching process needed for Ferrite magnet because it is brittle. Ferrite magnet can be made to different shapes and sizes by dry pressing then sintered, that is sintered ferrite magnet. Beside sintered ferrite magnet, bonded ferrite magnet(injection ferrite magnet) is existed. But sintered ferrite magnet are popular and widely used.
Ferrite magnet are the most commonly used permanent magnet material just because of its low cost, excellent corrosion and demagnetization resistance properties. Ferrite magnet can be made as isotropic and anisotropic. Isotropic if of the same magnetic properties in all direction, such as Grade-1. Anisotropic ferrite magnet must be magnetized in the direction of pressing.
By strength, ferrite magnet is stronger than AlNiCo magnet but weaker than neodymium magnet and SmCo (Samarium Cobalt ) magnet . Its working termperature is between from 40 degree to 250 degree. Because of these, ferrite magnet can be found in the application of separator and speaker and motor.
Sintered Ferrite Magnet (Hard Ferrite magnet, Ceramic Magnet) is made of ferric oxide/barium and strontium. It is included "Isotropic" and "Anisotropic" which is sintered through dry pressing or wet pressing by tool. It can be magnetized axially, radially, multi-poles axially and multi-poles on circumference, etc. As a low cost alternative to metallic magnets, Sintered Ferrite Magnet (Hard Ferrite Magnet, Ceramic Magnets) has won wide acceptance for high coercive force, excellent corrosion resistance, long-time stability and economical price. It has played an important role in electronic industry, car industry, medical treatment, mining and metallurgy industrial and etc, like motors, automotive sensors, loudspeaker, magnetic resonance imaging and etc. Besides, Sintered Ferrite magnet is widely use in Educational area.
