LYCOS RETRIEVER 
Ferrite: Ferrite Magnets
built 655 days ago
Ferrite magnets are a cost effective solution for Electric Motors, Audio Speakers, Electronics Industry, Mining and Metallurgy, Industrial Automation, Conveyor Belts and Health Treatment. POPULAR MAGNETS FOR CRAFT are Product Codes: 2060, 2070, 2085, 2120 and 2125. Click on Product Code to show Volume Discounts.
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Ferrite magnets are ceramics that are stronger by weight than steel or Alnico equivalents but less so than neodymium magnets. Like all ceramics, they are quite brittle & will easily break if dropped onto a hard surface. They are an economical choice for use with conveyor belts to extract stray metal.
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Ferrite bonded magnets are manufactured by mixing magnets with binders like epoxy. These bonded magnetic materials can be either Injection Molded or Compression Bonded. Normally there are two types of bonded ferrite magnets-ferrite rubber bonded magnet and ferrite-plastic bonded magnets. Ferrite-rubber bonded magnets are manufactured by mixing ferrite magnet powder and bonding synthetic rubber. In terms of strength and flexibility they are excellent and can be formed by extrusion molding into various shapes such as sheets, boards, bars, and cylinder. Ferrite-plastic bonded magnets on the other hand are composed of magnetic ferrite powder and bonding nylon.
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Ferrite magnets do not demagnitize with time or drive. They are affected by temperature but that is reversible. They will return to normal when they return to room temperature. Ferrite is basically a lousy magnet material for speakers but it is cheap and readily available. JBL has done a ton of things within the magnetic circuit to make the material behave in a more stable manner. At 100 degrees F, a Ferrite motor will be down about 1.5 dB in level which means the midband of the woofer will be lower by that much and there will be increased output around the system resonance.
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The corrosion resistance of Ferrite is considered excellent , and no surface treatments are required. However, Ferrite magnets may have a thin film of fine magnet powder on the surface and for clean, non-contaminated applications, some form of coating may be required.
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Ferrite magnets are formed by compaction in dedicated, multi-cavity dies followed by sintering in high temperature furnaces. This produces a hard, brittle part that requires diamond wheels for grinding to close tolerances. While physically quite strong, these magnets should not be considered a structural member in an assembly. And like most ceramics, they are brittle and should be handled so as to avoid chipping and cracking.
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Ferrite Magnets