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Bonded Magnets

Bonded magnets are among the most important magnetic materials currently available on the market.
Thermo-elastomers and thermoplastic resins can be mixed with a variety of magnetic powders to form injection moulded, compression bonded or flexible magnets.

Injection bonded magnets can be moulded into complex shapes and directly onto other components for the production of assembly parts (such as direct moulding onto a rotor shaft).

Compression bonded magnets, on the other hand, offer better magnetic characteristics but are limited to simpler geometries.
They are mainly used to obtain multipolar magnets and complex geometries (e.g. multi-pole ring magnets).

They are used for:

  • magnets for position and RPM sensors
  • complete magnetic rotors
Curie temperature °C 450
Recoil permeability (µr) 1.05-1.1
Saturation field kOe 14
Electrical resistivity Ω m > 104
Compressive strength N/mm2 ~ 700
Density g/cm3 ~ 5
Flexural strength N/mm2 55
Tensile strength N/mm2 50
Hardness – Vickers HV ~ 500
Young’s Modulus N/mm2 ~ 150
Specific heat kcal/kg.°C 0.8
Thermal conductivity kcal/m/hr/°C ~ 5
Coeff. of thermal expansion // 10-6/°C 14
Coeff. of thermal expansion_ 10-6/°C 9