At
Star Trace, we manufacture and supply ferrite magnets are composed of strontium carbonate and iron oxide. These are generally available in various forms like that of discs, rings, blocks, cylinders, and even arcs for motors in charcoal gray colour.
Manufacturing Ferrite MagnetsA powdered mixture if strontium carbonate and iron is injected into either a wet press dry press of forming. During this pressing process, a magnetic field is applied in the direction of preferred magnetization to orient the material and increase the magnet’s performance potential. This magnet is considered “ oriented”. If bit exposed to a magnetic field at time of formation, it is called “non-oriented” (Isotropic). After the molding process, the material is 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 (1-8 possible)
- Grade 8 is the strongest ferrite material available
Application Of Ferrite Magnets- Speaker magnets
- DC brush less motors
- Magnetic Resonance Imaging (MRI)
- Magnetos used on lawn mowers, and outboard motors
- DC permanent magnet motors (used in cars)
- Separators (Separate ferrous material form 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 & HandlingFerrite magnet material is extremely fragile and can chip or break if dropped on a hard surface, or if allowed to “jump at” an attracting object. It needs to be handled 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. When making magnetic assemblies with ferrite, it is easier for production purposes to magnetize the product after assembly.
MachiningSince ferrite material is brittle, it requires special machining techniques and equipment. We are fully equipped to cut and grind ceramic material according to your specifications.
FOR FURTHER DETAILS KINDLY MAIL TO: startrace@dataone.in