CERAMICCeramic Advantages (+) Ceramic Disadvantages ( - )
Inexpensive Hard to machine, must be diamond ground
High heat stability °-°F
Corrosion resistant Larger mass needed for magnetism than ALNICO
Medium hard to demagnetize
Ceramic Magnet Basic Information:
Made from Strontium Ferrous Oxide and some other trace elements.
They are sintered (pressed and baked).
They are often used in speaker and motor applications because of their low cost.
Grade 1-3 are supplied "as cast". Grade 5 and 8 are normally ground on magnetic faces. An as cast surface will look slightly rough and dark gray. A ground surface will look smooth with parallel grinding lines and dark gray.
Most commonly used magnet.
The most common grades of Ceramic are 5 & 8.
The optimum geometry for ceramic flat like a pancake. The thickness is best to be about 1/8 of the diameter. Magnetized through the thickness..
MANUFACTURING CERAMIC MAGNETS
A powdered mixture strontium carbonate and iron oxide is injected into either a wet press or a dry press for forming.
During this pressing process, a magnetic field increase he magnet's performance potential. This magnet is considered "oriented".
If not exposed to a magnetic field at time of formation, it is called "non-oriented" (isotropic)