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Electrical and magnetic properties

  • Resistivity
  • Conductivity
  • Curie temperature
  • Permeability

Resistivity

WC-Co Cemented Carbides have low resistivity and a typical value is 20 μW cm. Cemented Carbides with g-phase have a higher resistivity.














Conductivity

As a consequence of the low resistivity, WC-Co Cemented Carbides are good conductors, having a value around 10% of the copper standard. Alloying with g-phase forming carbides, e.g. titanium carbide, reduces this value considerably.

Due to the presence of cobalt (and nickel) in the binder phase, Cemented Carbides show ferromagnetic properties at room temperature.










Curie temperature

The transition of the cobalt binder phase from the ferromagnetic to the paramagnetic state occurs in a temperature range between approximately 950 to 1,050° C depending on the alloy composition.













Permeability

Although WC-Co Cemented Carbides contain a ferromagnetic binder phase, they usually have low magnetic permeability. It increases with the cobalt content and the typical range of values is 2 to about 12 when the vacuum value is equal to 1.