Our company is well-known manufacturer and supplier of Ferrite Magnet, made using an amalgamation of quality raw materials, modern machines and following the guideline of the experts. Ferrite Magnets are composed using strontium carbonate and iron oxide. They are charcoal gray in color and usually appear in the forms of discs, rings, blocks, cylinders, and sometimes arcs for motors. These Permanent Ferrite Magnets are offered at very cost-effective prices to assure satisfaction of customers.

A powdered mixture of strontium carbonate and iron oxide is injected into either a wet press or dry press for forming Ferrite Magnets. During this pressing process, a magnetic field is applied in the direction of preferred magnetization to orient the material and increase the performance of potential of magnets. This magnet is considered “oriented”. If not exposed to a magnetic field at time of formation, it is called “non-oriented” (Isotropic).

After the molding process, the material is then sintered at about 1010 C. This process is similar to that of kilting ferrite pottery, thus the popular name “Ferrite” Magnet. Lastly, the magnet is finish-ground to size with a diamond-bladed grinding wheel, magnetized, and inspected for shipment.

Attributes of Ferrite Magnets :

High intrinsic coercive force

Tooling is expensive

Least expensive material compared to alnico and rare earth magnets

Limited to simple shapes due to manufacturing process

Lower service temperature than Alnico, greater than rare earth

Finishing requires diamond cutting or grinding wheel

Lower energy product than alnico and rare earth magnets

Most common grades of ferrite are 1,5 and 8 (1-8 possible)

Grade 8 is the strongest ferrite material available

Applications:

Speaker magnets

DC brush less 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 designed for lifting, holding, retrieving and separating

Tolerances

Pressed dimensions are either +/- 2% or +/- 0.5mm whichever is greater. Cut dimension are either +/- 3% or +/-0.5mm, whichever is greater. Thickness tolerances are normally ground to +/- 0.1mm.Visual imperfections such as cracks, porosity, voids, surface finish, etc., (commonly found in sintered ceramic magnets) do not constitute cause for rejection.

Magnetizing and Handling

Material of Ferrite Magnet is extremely brittle and can chip or breakable if dropped on a hard surface, or if allowed to “Jump at” on attracting object. Handle with care. The weakest grade of ceramic material is grade 1, which is typically non-oriented. Grades 5 and 8 are oriented ceramic material. Grade 8 is the strongest ceramic magnet material available (Refer to properties chart below). When making magnetic assemblies with ferrite, it is typically easier for production purposes to magnetize the product after assembly.

Machining

Since ferrite material is so brittle, it requires special machining techniques and equipments. We are fully equipped to cut and grind ceramic material to customers’ specifications.



Note: Technical data and specification subject to change. # Special Ferrite Magnets can be made on request of customers, they have to just send us their technical data and application, required for our engineers.