Ferrite Magnets / Ceramic Magnets
Ferrite magnet, composed essentially of Fe2O3 (Ferric Oxide) and BaCo3 (Bariumar Bonate) or SrCo3 (Strontium Carbonate), offers an excellent cost/performance ratio. It is manufactured under a powder metallurgy process and classified into two types: Isotropic and Anisotropic. Isotropic is molded in absence of a magnetic field. Anisotropic can be further divided into "wet" and "dry" depending on pressing methods.
Ferrite magnet is substantially a kind of ceramic. Due to its excellent resistance to demagnetization and corrosion as well as the advantage of economic cost, it has been widely used in a variety of products and become popular in the market.
Practically, it is not necessary to make dimension precise by machining process, tolerance is generally approximately ±0.2% though it still depends on magnet shape. For a special application, the dimensional tolerance could be reduced to ±0.05mm by grinding after machining process. The residual flux density of ferrite magnet is subject to dimensional ratio, or magnet shape. If a magnet is designed for special use, such details as dimensional ratio and magnetizing direction are requested to provide for our reference.
- High coercive force, good uniformity in magnetic energy distribution and constant magnetic flux.
- Suitable for mass production.
- Easy to control uniformity.
- High electric resistance, acting like an insulator.
- Magnetic Properties of Ferrite Magnet in the table.
| Magnetic Properties | Symbol (Unit) | Isotropic | Anisotropic Sr/Dry (Ceramic 5) | Anisotropic Sr/Wet (Ceramic 8) |
|---|---|---|---|---|
| Residual Flux Density | Br (Gs) | 2,150-2,450 | 3,400-3,800 | 4,000-4,300 |
| Coercive Force | bHc (Oe) | 1,600-2,000 | 2,600-3,100 | 2,800-3,400 |
| Max. Energy Product | (BH) max MGOe | 1.0-1.2 | 2.8-3.2 | 3.5-4.0 |
| Temperature Coefficient of Residual Flux Density | Br/Br (% °C) | -0.19 | -0.19 | -0.19 |
| Curie Temperature | Tc (°C) | 450 | 450 | 450 |
| Reversible Permeability | µγ | 1.1-1.2 | 1.1-1.2 | 1.1-1.2 |
| Main Density | d (gr/cm³) | 4.6-4.9 | 4.6-4.9 | 4.7-5.0 |
Main Products:
Ferrite (Ceramic) Magnets, Rubber (Flexible) Magnets, Nd-Fe-B Sintered Magnets, Samarium Cobalt Magnets, Alnico Magnets, Magnetic Jewelry, Plastic Magnets