How are Ferrite Magnets Made?

Magnet Information

How Ferrite Magnets are made

The process for manufacturing ferrite magnets, also known as ceramic magnets, is not as costly or sophisticated as producing rare-earth neodymium magnets; here, we will explain the production process in an easy-to-understand way.

Let's break down the intricate process of crafting ferrite magnets. These robust magnets, composed of SrO-6 (Fe2O3), a combination of strontium carbonate and iron oxide, boast exceptional resistance to heat and corrosion. Despite their hardness and brittleness, they find application in various forms, like square tiles and cylinders. Machining involves high costs and diamond-coated tools.

Step One:

The journey begins with calcination, where a precise mix of iron oxide and strontium carbonate undergoes heating to produce metallic oxide material. In some grades, additives like cobalt and lanthanum enhance magnetic performance. Milling reduces the calcined material to particles smaller than 2 microns, each becoming a single magnetic domain.

Step Two:

Pressing and compacting the powder into a die, followed by sintering, shapes the magnet. During this process, an externally applied magnetic field results in an anisotropic magnet, aligning particles for superior properties. If dry-pressed without an external field, the magnet becomes isotropic, with weaker magnetic characteristics.

Step Three:

The compacted particles undergo high-temperature sintering, fusing together to form a single magnet. Magnetisation follows, and ferrite magnets require a relatively small external magnetising field.

Magnetic Properties:

Despite their lower overall magnetic strength compared to rare earth materials, ferrite magnets find widespread use in various commercial applications. Their key strengths lie in their resistance to demagnetization and corrosion, making them a cost-effective choice for scenarios where these properties outweigh sheer magnetic power.



How Ferrite Magnets are made

Every magnet from Magnet Store undergoes quality assurance, ensuring excellence in countless applications. Discover the strength and versatility of ferrite magnets in various shapes, crafted with precision for optimal performance.

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