Ferrite magnets
Ferrite magnets are easily identifiable by their black color. They are characterized by high durability and a reasonable price. The holding power of ferrite may be less than that of neodymium, but they can withstand high ambient temperatures (up to 250°C), are resistant to rust and are suitable for outdoor applications.
The magnetic force of ferrite magnets is perfectly adequate for simple applications and makes them a long-lasting and cost-effective alternative to other raw magnets.
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Ferrite magnet: composition and properties
The ferrite magnet consists of an alloy of iron oxide and strontium oxide in an 80:20 ratio. It is more resilient than a neodymium magnet, for example, and is used wherever the durability of the magnet is more important than its adhesive force. A ferrite magnet can withstand temperatures of up to 250°C, is corrosion-resistant and has a high resistance to demagnetization. The adhesive force is perfectly adequate for many simple applications. Due to its properties, it is also ideal for outdoor use.
A distinction is made between soft magnetic ferrites and hard magnetic ferrites in the magnetic material ferrite. The difference between these two lies in the coercive field strength. It is as low as possible in soft magnetic ferrites, which leads to rapid demagnetization when exposed to an opposing magnetic field. Soft magnetic ferrites are widely used in electrical engineering.
In our range, we only list hard magnetic ferrites with a high coercive field strength among the raw magnets.
For more information about hard ferrite, please visit our magnet encyclopedia!
Forms and production of ferrite magnets
At Magna-C, you can find hard ferrite magnets in the following forms:
- Disc magnets
- Ring magnets
- Block magnets
The basic components of the ferrite magnet are ground into a fine powder, heated to 1,000°C (calcination) and mixed with water and a binder. The dried product is still in powder form and is pressed into the shape of the raw magnet. The next step is sintering: the compressed powder is heated. This causes it to bind and condense until a blank is formed.
This is then ground, polished and magnetized – and the ferrite magnet is ready.