Aluminum-nickel-cobalt-magnets Manufacturers online

Aluminum-nickel-cobalt magnets, also known as AlNiCo magnets, are among the oldest and most powerful permanent magnet materials.

They consist mainly of aluminium (Al), nickel (Ni) and cobalt (Co) and often contain iron (Fe) as well as small amounts of other elements such as copper (Cu) or titanium (Ti) to optimize the magnetic properties.

Below you will find an overview of the material composition, magnetic properties, temperature behavior, mechanical properties and production of aluminum-nickel-cobalt magnets, as well as an overview of their areas of application and their advantages:

Material composition of aluminum-nickel-cobalt magnets:

The main components of aluminum-nickel-cobalt magnets are:

1. Aluminum (8-12 %)
2. Nickel (15-26 %)
3. Cobalt (5-24 %)
4. Iron and small amounts of other metals.

Magnetic properties of AlNiCo magnets:

1. Ferromagnetism: AlNiCo magnets are based on ferromagnetic properties. Their magnetization results from the parallel alignment of the magnetic moments of their atoms in an external magnetic field.
2. High remanence (Br): AlNiCo magnets retain a high proportion of their magnetization after the external field is removed.
3. High saturation level: They have a high magnetic saturation and can generate strong magnetic fields.
4. Temperature stability: They can be operated at temperatures of up to 500 °C without significant loss of performance.
5. Low coercive force: AlNiCo magnets have a low coercive force (resistance to demagnetization), which means that they can be easily magnetized and demagnetized.

Temperature behavior and mechanical properties of aluminum-nickel-cobalt magnets:

1. They retain their magnetic properties at high temperatures and in environments with chemical stresses.
2. They are relatively hard but brittle, which makes them sensitive to mechanical shocks.
3. AlNiCo magnets are resistant to corrosion and oxidation.

Production of aluminum-nickel-cobalt magnets:

1. Most AlNiCo magnets are produced by casting, where molten material is poured into molds.
2. An alternative is sintering, in which powdered raw materials are heated under pressure.
3. After casting or sintering, the magnets are often heat-treated and cooled in a strong magnetic field to align the magnetic domains.

Use of aluminum-nickel-cobalt magnets:

1. Electrical industry:
In sensors and measuring devices (e.g. speed sensors, magnetic field sensors).
In power generators and AC motors.

2. Medical devices:
In magnetic resonance devices (MRI).
In surgical instruments.

3. Loudspeakers and microphones:
AlNiCo magnets are widely used in audio technology as they enable precise sound quality.

4. Scientific instruments:
Used in laboratory equipment, e.g. in magnetometers and spectrometers.

5. Measuring and testing devices:
As components of compasses or magnetic brake systems.

Advantages of aluminum-nickel-cobalt magnets:

• AlNiCo magnets are ideal for applications that require extreme temperatures or changing temperature environments.
• They can be manufactured in various shapes such as horseshoes, rods or disks.
• They retain their functionality up to 500 °C.
• Due to their resistance to corrosion and oxidation, additional surface protection is often not necessary.
• The good availability of raw materials makes them cheaper than rare-earth magnets such as neodymium magnets.

AlNiCo magnets are versatile permanent magnets that are characterized by high temperature resistance, corrosion resistance and stable magnetic properties. Despite their lower coercive force and limited magnetic strength, they remain a preferred choice in many areas such as electrical engineering, audio technology and measurement technology. For applications requiring extreme temperatures or chemical stability, AlNiCo magnets continue to offer a cost-effective and reliable solution.

Here is an overview of the most important criteria to consider when purchasing aluminum-nickel-cobalt magnets:

Purchasing AlNiCo magnets requires a clear understanding of the technical requirements of the application as well as the properties of the material.

• AlNiCo magnets have a low coercive force, which is why they should not be used in applications with strong demagnetization fields.
• The maximum energy density (BHmax) describes the overall strength of the magnet. Higher values are important for powerful applications.
• Pay attention to the strength of the magnetic field that the magnet retains after magnetization.
• A high remanence should be selected for applications that require strong magnetic fields.
• AlNiCo magnets are temperature-resistant up to 500 °C. Check whether this is sufficient for your application.
• Make sure that the magnet retains its stability even with temperature fluctuations.
• Select magnets in the desired shape (e.g. rod, horseshoe, disk, ring). The geometry influences the magnetic field distribution and efficiency in the application.
• Take tolerances in the dimensions into account, as these are crucial for precise assembly.
• Ask about the specific alloy composition. A higher amount of cobalt, for example, improves temperature stability.
• Make sure that there are no unwanted impurities that could impair the magnetic or mechanical properties.
• AlNiCo magnets generally do not require an additional coating as they are corrosion-resistant. Nevertheless, check whether polishing or other surface treatments are important for your requirements.
• Suppliers with ISO 9001 certification often offer better quality assurance.
• Ask for a material test certificate (e.g. EN 10204) to confirm quality and composition.
• Suppliers with specialist knowledge can help you select the right magnet and provide technical advice.
• Small quantities are often more expensive per unit. If possible, order larger quantities to take advantage of volume discounts.
• Some suppliers only offer customization above a minimum order quantity.
• Obtain several quotes to determine the best price for your requirements.
• In addition to the initial cost, consider the life and reliability of the magnet.
• If standard shapes do not fit, check whether the supplier offers customized solutions.
• Clarify whether the magnet is supplied pre-magnetized or only needs to be magnetized after assembly.
• For precision applications, exact dimensions and performance specifications should be confirmed by the supplier.
• Check whether the supplier complies with the legal regulations for environmentally friendly production (e.g. RoHS, REACH).
• AlNiCo magnets are brittle and can break if handled improperly. Make sure that the packaging and delivery are secure to avoid damage.

Careful planning and consideration of these aspects will ensure that you select the right AlNiCo magnets for your applications.

Aluminum-nickel-cobalt magnets can be purchased from various suppliers. You will find comprehensive information on manufacturers and suppliers of Aluminum-Nickel-Cobalt Magnets around the world on Exportpages.