Ferrite Magnet

About Ferrite Magnet

A 103 ferrite disc magnet is a cylindrical permanent magnet with a diameter of 10 millimeters and a thickness of 3 millimeters, made from ceramic ferrite material, most commonly strontium ferrite (SrFeO) or barium ferrite (BaFeO). These magnets are widely used for their low cost, corrosion resistance, chemical stability, and moderate magnetic strength, making them ideal for industrial, electronic, hobby, and educational applications.

Material and Composition

The 103 ferrite disc magnet is a hard ceramic magnet, produced using powder sintering, which gives it its rigidity and magnetic properties. Its composition typically includes:

1. Iron Oxide (FeO) ~7075% by weight, which forms the ferrite crystal lattice and provides the magnetic properties.

2. Strontium Carbonate (SrCO) or Barium Carbonate (BaCO) ~2530% by weight, stabilizing the ceramic structure and enabling permanent magnetism.

3. Minor additives (02%) such as TiO or CoO, which may be added to improve sintering, reduce brittleness, or slightly enhance magnetic performance.

The powders are pressed into a disc shape and sintered at high temperatures (~12001300C) to produce a dense, hard, brittle, and magnetically active disc. The surface is typically matte or semi-smooth, and optional coatings (like epoxy or nickel plating) can be applied for additional corrosion protection, although ferrite is naturally highly resistant to moisture and chemicals.

Key Characteristics

1. Magnetic Properties

   • Permanent magnetism; retains magnetic field without external power.

   • Moderate magnetic strength compared to rare-earth magnets (neodymium).

   • Axial or radial magnetization possible depending on application.

2. Mechanical Properties

   • Hard and wear-resistant but brittle; can chip or crack under impact.

   • Stable dimensional accuracy, suitable for precise positioning in assemblies.

3. Chemical and Thermal Properties

• Excellent resistance to corrosion, moisture, acids, and alkalis.

• Electrically insulating and safe in electronic assemblies.

• Can operate effectively up to ~250C without significant loss of magnetization.

• Advantages

  • Cost-effective: much cheaper than rare-earth magnets.

  • Corrosion resistant: does not rust or degrade in humid or chemical environments.

  • Electrically insulating: ideal for electronics applications.

  • Temperature stable: maintains magnetic performance in elevated temperatures up to ~250C.

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  Summary:
  The 103 ferrite disc magnet is a hard, chemically stable, electrically insulating, and permanent magnetic disc suitable for a wide range of applications requiring moderate magnetic force, durability, and low cost. It is particularly useful in sensors, small motors, educational tools, and industrial assemblies where long-term stability and corrosion resistance are more important than maximum magnetic strength.