Overview of Ferrite Magnets
- Chemically inert so excellent corrosion resistance
- Good demagnetization resistance
- Cost effective
- Wide range of forms (usually machined to size)
Ferrites first became commercially available in the 1950’s and are the most commonly used permanent magnets today, mainly because of their cost effectiveness. They are produced by traditional powder pressing and sintering processes using a compound of ferric oxide and either barium or strontium carbonate. The anisotropic grades are field aligned during pressing and in all cases the compact requires machining to size.
Standards vs Specials
There is a wide range of standard tooling for discs, rings and blocks. Where one doesn’t exist and the volume required is high, it is usual to press to the approximate size and post machine. For lower volume and particularly for high precision parts we slice and machine from master blocks. Tooling for Ferram I isotropic magnets is inexpensive, but is a major consideration on the anisotropic Ferram A grades. As with the other materials we sell, we offer subassembly options and complex magnetizations.