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HARD FERRITE MAGNETIC
Hard ferrite (ceramic) industrial magnets were developed in the 1960's as a low cost alternative to metallic magnets. Even though they exhibit low energy (compared with other permanent magnet materials) and are relatively brittle and hard, ferrite magnets have won wide acceptance due to their good resistance to demagnetization, excellent corrosion resistance and low price per pound. In fact, measured by weight, ferrite represents more than 75 percent of the world magnet consumption. It is the first choice for most types of Dc motors manufacturers, manufacturer of magnetic separators, magnetic resonance imaging and automotive sensors.
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Barium and strontium Ferrite magnets are economical and quality components which may be found in such different applications like automation, control, measurement, etc.
Ferrite magnets may be isotropic or anisotropic. In anisotropic qualities, during the pressing process, a magnetic field is applied. This process lines up the particles in one direction, obtaining better magnetic features.
Through sintering, (thermal processing at high temperatures), pieces in their definite shape and solidity are obtained.
Available:
=>Ferrite Blocks
=>Ferrite Disks
=>Ferrite Rings
=>Technical Properties
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Ferrite magnetic are sintered permanent magnets composed of Barium or Strontium Ferrite. This class of magnets, aside from good resistance to demagnetization, has the popular advantage of low cost. The corrosion resistance of Ferrite is considered “excellent”, and no surface treatments are required.
Ferrite magnets can be produced isotropically or anisotropically. Isotropic grades are not oriented and can be magnetized in any direction, although some degree of greater magnetic strength will be found in the pressing dimension, usually the shortest dimension. Anisotropic grades are oriented in the manufacturing direction, and must be magnetized in the direction of orientation.
Due to their low cost, Ferrite magnets enjoy a very wide range of applications, from motors and loudspeakers to toys and crafts, and are the most widely used permanent magnets today.
Ferrite magnets are very hard and brittle, and require specialized machining techniques. Moreover, they should be machined in an unmagnetized state.
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The raw materials Magma uses to produce hard-ferrite magnets, ate Barium-Ferrite and Strontium-Ferrite .
These raw materials ate easily (Sr0.6 Fe203) and Strontium-Ferrite (Ba0.6 Fe203) available and therefore hard ferrite magnets offer the best value for money.
Anisotropic sintered ferrite permanent magnets are made by using ceramics technology, similar to the one used for making porcelain The powder is pressed under the influence of external magnetic field to determine 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 magnetizing remains permanent, and stability is excellent. Being oxids, hand ferrites operate in a very tough environment, without the need of coating (the surface can however be coated, if extreme cleanliness is needed by the customer).
Hard ferrite's mechanical properties are like other ceramics. They are sensitive to mechanical impact. Machining is done mainly by diamond grinding.
Wet pressed anisotropic hard ferrites are now used extensively in the automotive industry, as rotors or stators in D.C. motors, in home appliance industry, as rotors for synchronous motors and in the audio industry in loudspeakers, earphones and micromotors.
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The taw materials Magma uses to produce hard-ferrite magnetic, are Barium-Ferrite and Strontium-Ferrite .
These raw materials are easily (SrO.6 Fe203) and Strontium-Ferrite (Ba0.6 Fe203) available and therefore hand ferrite magnets offer the best value for money.
Anisotropic sintered ferrite permanent magnets are made by using ceramics technology, similar to the one used for making porcelain The powder is pressed under the influence of external magnetic field to determine 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 magnetizing remains permanent, and stability is excellent. Being oxids, hard ferrites operate in a very tough environment, without the need of coating (the surface can however be coated, if extreme cleanliness is needed by the customer).
Hard ferrite's mechanical properties are like other ceramics. They are sensitive to mechanical impact. Machining is done mainly by diamond grinding.
Wet pressed anisotropic hard ferrites are now used extensively in the automotive industry, as rotors or stators in D.C. motors, in home appliance industry, as rotors for synchronous motors manufacturers and in the audio industry in loudspeakers, earphones and micromotors.
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Material Information
* Produce by powder metallurgical method
* Chemical composition of Ba/Sr O FeO
* Relatively brittle & hard
* Good resistance to demagnetization
* Excellent corrosion resistance
* Raw material is readily available & low in cost
* Good temperature stability
* Most widely used permanent magnets. |
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Magnets
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