Electrical properties of technical ceramics
One of the most favorable properties of technical ceramics is their distinct electric insulating capacity.
In most cases, their high specific electrical resistance combines with high dielectricstrength, i.e. the maximum electric field that the respective material can withstand without causing an electric breakdown in the form of electric arcs or sparks. Steatite and forsterite exhibit maximum dielectric strength in silicate ceramics, followed by alumina and silicon nitride. Their characteristic values are even higher than those of cordierite.
Insulation: compounds for maximum values
Generally, the permittivity of technical ceramic is small and electric polarization is low. The same applies to dielectric losses: ionic polarization decreases whit increasing frequency. Regarding electrical insulation, silicate ceramics i.e. steatite, superpyrostat, cordierite and forsterite exhibit high values on nearly the same level.
In the oxide ceramic material group, the electrical resistance of alumina is higher than that of zirconia. Therefore, alumina and non-oxide ceramic material silicon nitride share the top position in all groups of materials.
Please see our material data sheet for further information.
Would you like detailed information about the properties of materials used at Sembach Technical Ceramics, or do you have other questions or a specific inquiry? Please contact us, we would be pleased to help you.