Alnico Magnets

Álnico magnets are composed of an alloy of aluminum, nickel, and cobalt. They are the magnets with the highest stability at extreme temperatures; for this reason, we can find them inside ovens performing the function of holding or detecting.

Álnico magnets are created through a production process that has two different methods of creation: casting or sintering. In these two processes, we find the molding phase, which allows us to create magnets of different shapes according to the need we want to fulfill.

We supply álnico magnets with the best characteristics. Additionally, álnico magnets can come in different shapes such as rods, blocks, rings, or discs.

The álnico magnet was made of aluminum, nickel, and cobalt. Álnico magnets have good corrosion resistance, providing magnetic stability.

The horseshoe-shaped álnico magnet is the most well-known product due to its design, which is attributed to describing a conventional magnet.

The álnico magnet possesses both isotropic and anisotropic properties, depending on the required grade. The most common grades of álnico are 5 and 8. Álnico magnets have an ease of magnetization due to their low coercive force.

Similar to samarium magnets, álnico magnets have a higher cost compared to other permanent magnets, as they are made from cobalt. Cobalt is a raw material that comes from abroad, making its cost elevated.

The álnico magnet is the magnetic element with the greatest stability at extreme temperatures, meaning it retains all its magnetic properties between -250°C and 425°C, ensuring high thermal resistance. (In the case of neodymium magnets, the maximum working temperature is 200°C).

We provide a table displaying the characteristics of álnico magnets for your reference. It indicates magnet qualities such as magnet remanence, coercive force, working temperatures, and minimum and maximum resistance.

Alnico magnets, thanks to all the characteristics mentioned above, can be used in various sectors. In addition, they have a high magnetic induction because this type of permanent magnet can be used in magnetic field measuring instruments.

The high temperatures at which alnico magnets can work, together with their thermal resistance and their great strength, open up a wide range of possibilities in different industrial sectors. It is a perfect alternative to materials such as neodymium or ferrite.

To obtain alnico magnets we can follow two processes: casting and sintering:

1. The phase known as weighing, in this we must make the correct composition of the magnet avoiding oxidation and impurities of the raw materials.
2. The fusion process. Here we find the molten matter that will later be poured into a mold.
3. Later, continuing with the melting phase, we will identify the quality of the magnet according to the level of whiteness that the magnet has
4. Next, we will pass the magnet to heat treat it to give it future resistance to oxidation.
5. Finally, it will be magnetized and the production process for this alnico magnet will be terminated.