Ferrite magnets

Ferrite magnets

Ceramic(Ferrite) Magnets offer the best value when comparing cost with other type of magnets. Ceramic (Ferrite) magnets are inexpensive, moderate in magnetic strength, and they are easily magnetized in a variety of formats. Ceramic magnets offer good corrosion resistance and generally do not require a coating or plating. Consideration should be given to the grade of alloy when exposing Ceramic magnets to temperature extremes. Ceramic (Ferrite) magnets have good resistance to external demagnetization fields because of its high Intrinsic Coercive Force (Hci) . This resistance and low cost makes Ceramic magnets a popular choice for electromechanical applications.

Ceramic (Ferrite) magnets are very hard and brittle. Like all magnetic materials, ceramic should not be used as a structural element in a design. Ceramic (Ferrite) magnets are particularly prone to cracking when the application involves impacts or flexing. As with most ceramic, the ferrite magnets should not be exposed to heating or cooling rates greater than 200°F per hour.

Ceramic(Ferrite) Magnets Manufacturing Process

Ceramic (Ferrite) Magnets are produced by calcining a mixture of iron oxide and strontium carbonate to form a metallic oxide. A multiple stage milling operation reduces the calcined material to a small particle size. The powder is then compacted in a die by one of two methods. In the first method, the powder is compacted dry which develops an isotropic magnet with weaker magnetic properties, but with better dimensional tolerances. Often times a dry pressed magnet does not require finish grinding. In the second method, the powder is mixed with water to form slurry. The slurry is compacted in a die in the presence of a magnetic field. The applied field creates an anisotropic magnet which exhibits superior magnetic properties, but usually requires finish grinding.

The compacted parts which approximate the finished geometry are then sintered at high temperatures to achieve the final fusion of the individual particles. Final shaping is achieved by diamond abrasives. Usually the pole faces of the ceramic (ferrite) magnets will be ground and the remaining surfaces will exhibit "as sintered" tolerances and physical characteristics.

Grades available:
Chinese standard grades:Y10T,Y20, Y22H, Y23, Y25, Y26H, Y27H, Y30,Y30BH...
USA standard grades:C1, C5, C7, C8

Attributes:

   1. Least expensive material compared to alnico and rare earth magnets
   2. High intrinsic coercive force
   3. Available in simple shapes only due to manufacturing process
   4. Lower service temperature than alnico, greater than rare earth
   5. Finishing requires diamond cutting or grinding wheel
   6. Lower energy product than alnico and rare earth magnets
   7. Most common grades of ceramic are 1, 5 and 8 (1-8 possible)
   8. Grade 8 is the strongest ceramic material available
   9. Tooling can be expensive

Magnetization:

Ferrite magnet has Anisotropic and Isotropic two type.

Anisotropic types are oriented in the manufacturing direction, and must be magnetized in the direction of orientation. Isotropic types are not oriented and can be magnetized in any direction.

Two manufacturing Process
1.Dry process: By dry process, can produce isotropic & anisotropic magnets;the tool can be changed and developed easily.
2.Wet process: By wet process, only anisotropic magnets can be produced;it is complicated to change the tool and the tooling charge is much higher

Product (331)

SmCo magnets (1)

Alnico magnets (1)

Ferrite magnets (1)

NdFeB magnets (1)

Glossary (2)

Credit Report

Products Index

Company Info

Premium Related Suppliers

Ferrite magnets