FERRITE

PERMANENT MAGNETS

FERRITE

Ceramic Permanent Magnets

Ferrite magnets are produced using iron oxides and strontium and / or barium carbonate. The raw materials are mixed, ground and subsequently subjected to an appropriate heat treatment to obtain the compounds: SrFe12O19, BaFe12O19. The product thus obtained is further ground to obtain a finer powder mixture. The pressing process, which can also be carried out dry, is carried out both under the effect of a magnetic field and without a magnetic field. This differentiation is relevant in that: in the first case anisotropic material is obtained while in the second case isotropic magnets are obtained. Finally, the material is sintered.

Currently Ferrite magnets are used on a very large scale thanks to the reduced costs and the great availability of raw materials, together with the rather simple production process. Peculiarity of Ferrite magnets is the resistance to water and humidity, since it is a material derived directly from oxides it does not fear corrosion. Ferrite magnets are intrinsically fragile, therefore it is recommended not to use them as structural elements in any application and to handle them carefully to avoid chipping.

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CORROSION RESISTENCE

Being composites mainly of iron oxides with the addition of metal elements such as barium, manganese, nickel and / or zinc; the wounds have the same properties as a ceramic material and are not subject to corrosion processes.

STABILITY

The homogeneous relationship between induction and coercive force also makes them the most stable magnets on the market.

LOW PRICE

The widespread use of raw materials and the widespread production process make ferrite the most economical magnetic material on the market.

EASY TO PROCESS

Ferrite magnets are among the most resistant from a mechanical point of view but can also be easily machined by simple water-cooled cutting systems.

MAGNETS COMPARED IN THE HYSTERESIS CYCLE
FEATURES OF DIFFERENT MAGNETS

APPLICATIONS

LIST OF MOST DIFFUSED APPLICATIONS

ELECTRIC MOTORS

Ferrrite Permanent Magnet motors have characteristics with low torque values ​​and constant presumptions.

LOUDSPEAKERS

Ferrite magnets are used to make loudspeakers, vibrations are generated by the movement of the electrically stimulated magnet.

GENERATORS

The generators of this type can therefore operate both at low speeds.

SENSORS

Magnetic sensors are used to verify the position without need of contact.

MAGNETIC SEPARATION SYSTEMS

Permanent magnet separation systems are used in various sectors of the industry. From the production of chemical products to food, in light industry as well as in the production of minerals.

FAQs

TECHNICAL AND OPERATING INFORMATIONS

Do ferrite magnets lose their strength over time?

Ferrrite magnets are the cheapest and the most resistant; if they are not physically damaged, Ferrite magnets lose less than 1% of their strength in over 10 years. They do not lose their strength even if they are always kept in a working position, both buffer and attractiveness!

Why are ferrite magnets resistant to moisture?

Ferrite is a material composed of iron oxides bound to other elements such as strontium, barium, nickel and / or zinc. This alloy obtains the same hardness as a ceramic material, therefore it behaves like a ceramic with respect to resistance to corrosion and to the formation of rust.

What is the difference between hard and soft ferrite?

  • Hard ferrites have high coercivity, so they are difficult to demagnetize. They are used to make permanent magnets for loudspeakers and small electric motors.
  • Doft ferrites have a low coercivity, so they easily change their magnetization and act as conductors of magnetic fields. They are used in the electronics industry to create systems for high frequency inductors and transformers and in various microwave components.

What defines the grade of a FERRITE magnet?

  • The grades of ferrite magnets are usually indicated with Letters and numbers (for example "Y26H-01")
  • Previously a shorter term was used (C2, C3 etc.), now the first letter C (initial of ceramic) was replaced with the letter Y indicating the type of material.
  • The following number indicates the maximum energy produced by the magnet, other letters and numbers can be added to indicate the variation of other characteristics for the same type of magnet.

Do I have to worry about operating temperatures using Ferrite magnets?

Ferrite magnets are usually used for working temperatures up to 250 °, permanently losing their magnetization at a temperature above 450 °. For how much it concerns the behavior in cold environments they lose the magnetization to temperatures inferior to -40 °.

What is the difference between Isotropic and Anisotropic Ferrites?

Isotropic Ferrite is produced starting from the powder of raw material; the ferrite mixture is pressed into a mold and then sintered in an oven at about 1300 ° C. The product thus obtained can be sent for magnetization. Peculiarity of this material is the possibility of being magnetized in any direction since the magnetic crystals are in a random and homogeneous order in the magnetic mass. The magnetic properties are therefore analogous along any axis.
Anisotropic Ferrite is also produced starting from dust; the ferrite mixture, sometimes hydrated, is used in a mold on which an intense magnetic field immediately acts. The product obtained is then sintered and subsequently the surfaces are adjusted - mandatory step for the productions in which water has been added to the mixture. This material can then be magnetized only along the predefined direction from the magnetic field applied during pressing. The magnetic crystals are therefore in a defined order. The magnetic properties along this axis are decidedly better than those of isotropic magnets.