Ferrite magnet
Magma Magnets Manufacturing
This is a readily available raw material and therefore hard ferrite magnets offer the best value for money.
Anisotropic sintered ferrite permanent magnets are made by using ceramics technology, similar to that used for making porcelain The powder is pressed under the influence of an external magnetic field which determines the magnetic orientation of the powder grains.
Magma specializes in the production of anisotropic wet-pressed magnets. "Hard" magnets are characterized by high coercivity (Hcb, Hci), related to the remanence (Br).
Their magnetization is permanent, and their stability is excellent. Being oxides, hard ferrites can operate in a very tough environment, without the need of coating (the surface can however be coated, if high levels of cleanliness are needed by the customer).
Hard ferrite's mechanical properties are similar to other ceramics. They are sensitive to mechanical impact. Machining is performed with electroplated diamond grinding wheels.
Wet pressed anisotropic hard ferrites are now used extensively in the automotive industry, as rotors or stators in D.C. motors, in home appliances, as rotors for synchronous motors and in the audio industry in loudspeakers, earphones and micromotors.
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