Hard ferrite magnets (Ferrites)

Magnets made of ceramic materials are the most commonly used worldwide because they are versatile, corrosion-resistant, and cost-effective. masetec offers you a wide range of hard ferrite magnets.

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Areas of application

Position control, non-contact switching, speed measurement

All advantages at a glance

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Cost-effective:

Very good price-performance ratio, ideal for mass applications.

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Corrosion-resistant:

Rustproof, no additional coating required.

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Temperature-resistant:

Operable from -40°C to 250°C without loss of performance.

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Good chemical resistance:

Insensitive to many chemicals and solvents.

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Versatile in use:

Frequently used in loudspeakers, electric motors, and magnetic closures.

Caution with hard ferrite magnets

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Limited adhesive strength:

Lower magnetic strength compared to NdFeB or AlNiCo magnets.

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Risk of breakage:

Brittle, not shock- or impact-resistant, can splinter easily.

Use of hard ferrite magnets

Due to their low price and safe handling, hard ferrite magnets are particularly popular for household use – for example, as whiteboard magnets. These robust magnets are also used in electronics, electrical engineering, the automotive industry, medical technology, and many other sectors.

Structure of hard ferrite magnets

Hard ferrite magnets are manufactured from iron oxide and barium carbonate or strontium carbonate.

Production of hard ferrite magnets

There are two processes for manufacturing hard ferrite magnets: Isotropic hard ferrite magnets are created by finely grinding the raw materials, granulating them, pressing them in a magnetic field, and sintering them. Anisotropic magnets are produced using dry or wet pressing processes. In the wet pressing process, the alloy powder is mixed with liquid to form an emulsion and injected into the pressing tool via filling channels. During the subsequent compaction under the influence of a magnetic field, part of the liquid is extracted. The remaining moisture must be removed by air or oven drying before sintering. The more complex wet pressing process achieves higher magnetic properties.

Coatings on hard ferrite magnets

Since hard ferrite magnets are heat- and corrosion-resistant, a coating can be omitted. Furthermore, a coating would disproportionately increase the low price of hard ferrite magnets.

Magnet selection guide


ENERGY PRODUCT	Ferrites	AlNiCo	NdFeB
COSTS	Ferrites	AlNiCo	SmCo
MAX. OPERATING TEMPERATURE	NdFeB	SmCo	AlNiCo
CORROSION RESISTANCE	NdFeB	AlNiCo	Ferrites
RESISTANCE TO DEMAGNETIZATION	AlNiCo	Ferrites	SmCo
MECHANICAL STRENGTH	Ferrites	NdFeB	AlNiCo
TEMPERATURE COEFFICIENT	AlNiCo	SmCo	Ferrites
MAGNETIC STABILITY AT HIGH TEMPERATURES	NdFeB	Ferrites	SmCo


Energy product	Ferrites	AlNiCo	NdFeB
Costs	Ferrites	AlNiCo	SmCo
Maximum operating temperature	NdFeB	SmCo	AlNiCo
Corrosion resistance	NdFeB	AlNiCo	Ferrites
Resistance to demagnetization	AlNiCo	Ferrites	SmCo
Mechanical strength	Ferrites	NdFeB	AlNiCo
Temperature coefficient	AlNiCo	SmCo	Ferrites
Magnetic stability at high temperatures	NdFeB	Ferrites	SmCo