Ferrite Magnets Archives

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Ferrite magnets also called black magnets are made of iron oxide and barium or strontium ferrite. Ferrite magnets are highly resistant to corrosion and adverse external factors; so they do not need any type of coating.

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:

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CHARACTERISTICS

Type of material

Ceramic

Composition

Iron oxide
Barium Ferrite or Strontium

Work temperature

From -40ºC to 250ºC

Advantages

Economic magnets
Great resistance to corrosion
Outdoor application

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.

CONSULT QUALITY TABLE

IMA	Grado	Nomenclatura	Remanencia			Fuerza Coercitividad			Coercitividad Intrínsica			Energía Máxima Producto	Temperatura de Trabajo
	Grade	Nomenclature	Remanence			Coercive force			Intrinsic coercive			Maxium energy product	Working temp
Ferrite Magnets	Grade	Nomenclature	Br			Fuerza bHc			Fuerza Ihc			(BH) max	Working temp
Ferrite Magnets	Grade	Nomenclature	Br max (T)	Br min (T)	HcB min (kA/m)	HcB max (kA/m)	HcJ min (kA/m)	HcJ max (kA/m)	BHmax min (kJ/m³)	BHmax max (kJ/m³)	Max. Temp. trabajo: (ºC)
HF 7/21 isotropic	Y10T	HF 7/21	0,20	0,22	125	145	210	250	6,5	8,0	250
HF 26/20 anistropic	Y30	HF 26/20	0,38	0,39	191	210	199	220	26,0	28,0	250
HF 27/23 anistropic	Y30BH	HF 27/23	0,38	0,39	223	235	231	245	27,0	30,0	250

Applications

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:

Lifting Magnets

Brakes

Hard Drives

Speakers

Headphones

ABS System

Sensors

Alternator

Magnetic shock absorbers

Production process

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

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.
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).
Then the powder obtained by the previous step is pressed with a certain shape.
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.

Ferrite Magnets