Ferrite Magnets

To obtain ferrite magnets or ceramic magnets we have a production process more specifically for molding, we can find different shapes of ferrite magnets depending on the need. Since it is not the same to use it for a car engine than for a magnetic closure.

Ferrite magnets are multifunctional permanent magnet, that is, it has a wide range of applications, so depending on it we are going to allocate find:

The first ferrite to be used was magnetite which was used for compasses. It was not until the end of the 19th century that the components which form the alloy of the ferrite magnet became established. Ferrite magnets can also be called ceramic magnets, due to their visual appearance being a dark gray metallic oxide resembling porcelain.

Depending on the coercivity of the ferrite we can find:

Hard Ferrite Magnets: Hard ferrite magnets are those with high coercivity, so they are not easy to demagnetize. Hard ferrite magnets are composed of iron, cobalt, barium, and strontium → these are used for speakers and microwaves among others.

Soft ferrite magnets: Hard ferrite magnets are those with low coercivity, unlike hard ferrite magnets, which are easier to demagnetize. Soft ferrite is composed of a mixture of iron and light metals (nickel, aluminum, or manganese) → these are intended for electrical transformers.

When working with anisotropic qualities, an alignment of the particles is made in a single direction, obtaining magnetic characteristics. In addition to being anisotropic, they can also be isotropic, unlike anisotropic, the clamping ferrite magnet strength is lower.

Large ceramic magnets have high hardness and high brittleness. In addition, with these magnets, you can work from -40ºC to 250ºC. Ferrite magnetic permeability is so high, which means that this type of permanent magnet, like others with high magnetic permeability, has a great power of attraction.

Black magnets are the cheapest on the market. Ferrite magnets have a high corrosion resistance and, therefore, are one of the most appropriate products for different outdoor uses thanks to being stainless. They are probably the best alternative to neodymium magnets since they are not only resistant to moisture and corrosion but also resistant to different types of chemicals.

By having high corrosion resistance, we can use ferrite magnets for outdoor applications and in places where there is a lot of humidity.

Depending on the type of ferrite magnet, we can use it for one application or another. In other words, an application for use with a reduced space is not the same as an application with a larger space. On the other hand, depending on whether it is a soft ferrite magnet or a hard ferrite magnet, we will use it for one application or another.

The black magnets are quality components. In addition, they are the cheapest magnets in the group of permanent magnets, which is why they have different applications, the most important of which are:

Ferrite magnets need to follow a series of steps to ensure quality, which is why we will explain them in detail below:

1. The first step to obtaining the ceramic magnet is the production of the ferrite. Ferrite magnetic materials are obtained through the fusion of various metal oxides which are subjected to high temperatures.
2. To continue with the production of this permanent magnet, we pass the fusion obtained to grind it until we obtain very small particles (each particle will have an independent magnetic domain).
3. Then the powder obtained by the previous step is pressed with a certain shape.
4. Finally, the ferrite is subjected to sintering. This process is characteristic of its scarcity of oxygen and for the presence of separators. These separators are of great importance since they will influence the final result, more specifically the magnetic properties.