Isotropic Ferrite Magnets for stepping motor

What's Ferrite Magnet?

A ferrite magnet is a type of Permanent Magnet made from a compound of iron oxide (Fe3O4) and other metallic elements such as nickel, zinc, or manganese. It is also known as a Ceramic Magnet due to its brittle and ceramic-like appearance. Ferrite magnets are widely used because of their low cost, high magnetic properties, and resistance to demagnetization. They are commonly found in various applications such as speakers, motors, magnetic separators, and refrigerator magnets.

Barium Ferrite Magnets, Ferrite Disk Magnets, Permanent Magnet Rotor

The production of Ferrite Magnet?

The production of Ferrite magnets involves several steps:

1. Raw material preparation: The primary raw materials used for ferrite magnets are iron oxide and strontium carbonate or barium carbonate. These materials are mixed together in specific ratios to achieve the desired magnetic properties.

2. Mixing: The mixed raw materials are then ground into a fine powder using ball mills or attrition mills. This step ensures that the particles are homogeneously mixed and have a consistent size distribution.

3. Pressing: The powder is then compacted into the desired shape using a hydraulic press. The pressing is done at high pressure to ensure that the particles adhere together and form a solid mass.

4. Sintering: The compacted shapes are placed in a high-temperature furnace and heated to a temperature between 1,200 to 1,400 degrees Celsius. This process, known as sintering, causes the particles to bond together and form a solid magnet.

5. Machining: After sintering, the magnet is often machined to achieve the desired dimensions and shape. This can be done using diamond grinding wheels or other cutting tools.

6. Surface treatment: The magnets may undergo surface treatment to improve their corrosion resistance and appearance. This can involve coating the magnets with a protective layer or plating them with metals like nickel or zinc.

7. Magnetization: The final step is magnetization, where the magnets are exposed to a strong magnetic field to align the magnetic domains within the material. This process enhances the magnet's magnetic properties.

After production, ferrite magnets are used in various applications, including electric motors, speakers, magnetic separators, and magnetic resonance imaging (MRI) machines.