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Ferrite Magnet | Industrial Magnet Supplier in China

Development history of ferrite magnets

Ferrite magnets (or hard ferrite) are developed at Philips Physics Laboratory in 1950s. They became commercially available in the 1960s due to its low cost and high magnetic performance. They are also called ceramic magnets because 1) the sintering process of this magnet material is similar to ceramic and 2) both are electrically insulating. Permanent magnets really penetrated into our everyday life with the commercialization of hard ferrite. Prior to ferrite magnets, only AlNiCo magnets had dominated the permanent magnet market.

ceramic arc magnets

What makes ferrite magnets different?

Comparing to other permanent magnets, ferrite magnet has a low maximum energy product of up to 5.5MGOe. However, its high coercivity and cost-effectiveness make it an ideal magnetic material for a variety of applications. Measuring by weight, it accounts for over 75% of the global permanent magnet consumption. Ferrite arc magnet is also an important component in electric motors.

  • low cost
  • high magnetic performance
  • high temperature resistance (≤ 250℃)
  • high resistance to demagnetization
Common grades are Y30, Y35, Y30BH magnet or C5, C8, etc. Strontium ferrite magnets are the most manufactured hard ferrite type.

Manufacturing process of sintered ferrite magnet

ceramic ring magnet speaker magnet
ferrite ring blank after wet-press in a mold
6x4x1 ferrite magnet
ferrite block magnet
ceramic ring magnets
ferrite ring magnet
ferrite arc magnet
ferrite arc magnet
ceramic arc magnets
ferrite arc magnet

Physical Properties of ferrite magnets

Ferrite Magnets – Typical Physical Properties
PropertyUnitsValue Ceramic (Strontium Ferrite)
Vickers HardnessHv~ 1160 (7 Mohs)
Densityg/cm34.5 to 5.1
Curie Temp TC°C450 to 460
Curie Temp TF°F840 to 860
*Specific ResistanceμΩ⋅Cm> 106
Bending StrengthkN/mm20.05 – 0.09
Tensile StrengthkN/mm2.02 to .05
Thermal Expansion (∥)°C-1+11.0 to +16.0 x10-6
Thermal Expansion (⊥)°C-1‘+7.0 to +15.0 x 10-6

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Jonah Jin

Jonah Jin
Managing Director

Every customer deserves to be treated professionally and responsively.