Ferrite Magnet
Ferrite Magnets
Ferrite magnets, made from widely available iron oxide (Fe₂O₃), are cost-effective and steadily supplyable sintered magnets. Featuring high coercivity and strong demagnetization resistance, they are especially suitable for flat-shaped products. They are produced by compacting magnetic powder in a forming press and then sintering in a kiln at approximately 1200°C. With excellent corrosion resistance, they are ideal for mass production. Ferrite magnets are mainly divided into two categories: Anisotropic Ferrite Magnets and Isotropic Ferrite Magnets. As essential functional materials in the electronics industry, ferrite magnets are widely used in passenger vehicles, motorcycles, home appliances, power tools, and other fields.
Features of Ferrite Magnets
- Main component is iron oxide, offering low cost.
- High coercivity, resistant to demagnetization.
- Sintered magnets using oxide raw materials, providing excellent corrosion resistance.
- Cannot be cut or drilled after forming.
- Widely used in various industries due to their low price.
- Molds are required according to specific dimensional requirements.
Main Raw Materials
Iron Oxide (Fe₂O₃), Strontium (Sr) or Barium (Ba)
Anisotropic Wet-Pressed Ferrite Magnets
These anisotropic magnets are formed from magnetic slurry with a certain moisture content. During compaction, an external magnetic field aligns the magnetic particles, which are then pressed into shape. Their magnetic properties are superior to dry-pressed anisotropic magnets, with a maximum remanence of up to 470 mT. Although wet-pressed anisotropic magnets have a slower forming speed, larger dimensional tolerance, and require more grinding, their high performance makes them the mainstream product in the market. They can be manufactured into arc-shaped, flat-shaped products.
Anisotropic Dry-Pressed Ferrite Magnets
These anisotropic magnets are pressed from magnetic powder within a specific particle size range, with an external magnetic field aligning the particles during forming. Advantages include fast forming speed, high precision, and low grinding allowance. Their magnetic properties are higher than isotropic magnets, with a maximum remanence not exceeding 410 mT. They are suitable for producing arc-shaped, ring-shaped and flat-shaped products with moderate performance requirements.
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