Sintering entails heating the material to between about 1150☌ and 1300☌. To manufacture the ferrites used in inductors and other applications, the powers of the metals are mixed in proportions and then milled to give the required grain size and then pressed into shape. They generally have the chemical structure of the format XFe2O4, where X is a transition material.
Generally hard ferrites are considered to be those with coercivity levels of greater than 10 kA/m.įerrites are generally chemically inert ceramic iron-based materials. They are cheap to produce and are the magnets that are used in a wide number of applications, but may be most commonly seen in such applications as standard household magnets (e.g., kitchen magnets). Hard ferrite magnets are typically made of barium, iron or strontium oxides. They retain the polarity of their magnetisation once the magnetising field has been removed, i.e. Hard ferrites: Hard ferrites may also be called permanent magnets.Generally soft ferrites are accepted as those having a coercivity of less than 1 kA.m. As a result of their high resistance, soft ferrites are widely used in the cores of inductors or transformers because they result in minimal energy loss. Manganese-zinc and nickel-zinc magnets are the most common of the soft ferrite magnets. Soft ferrites are often made from a blend of iron, nickel, zinc or manganese oxides. Soft ferrites also have a high electrical resistance and therefore, when used in inductors and transformers eddy current losses are also low. This means that there is only a relatively small loss of energy. Soft ferrites: Soft ferrites are ferrite materials that are able to easily reverse their polarity of their magnetisation without a significant amount of energy being needed to reverse the magnetic polarity.What is ferrite?įerrites are basically iron based magnetic material in the form of a ceramic.įerrites are made from a powder and can therefore the ferrite cores used in inductors and other applications can be manufactured in a variety of shapes according to the requirements.įerrites, or as they are also known ferromagnetic materials can be classified into two categories based on their magnetic coercivity, or persistence of internal magnetism: Inductor ferrite is used to provide an increase in the permeability of the medium around the coil to increase the inductance of the inductor.įerrites are widely used within inductor technology to improve the performance of the inductor.
Inductor types Specifications How to select the right inductor Ferrites Ferrite beadsįerrites are one of the main core materials used in inductors and transformers. Inductor Ferrites Details of ferrites and their technology used for the core material for many inductors and transformers.