Stationery: Ferrite core

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The term ferrite core may refer to a core used to build an electric transformer; there are two kinds of core (nucleous) applications following the size and frequencies: - for signal transformer - for power transformer
Following the shape there are toroidal cores, shell cores, cylindric cores, and so on.
The ferrite cores used for power transformers are working in the range of low frequencies (1 to 50 kHz usually) and are quiet big size, can be toroidal, or shell or C shape and are useful in all kind of switching electronic device (especially power supplies from 1 Watt to 100 W maximum because usually powerful applications are out of range of ferritic single core and required grain oriented laminations cores).
The ferrite core used for signal have a range of applications from 1 kHz to many MHz perhaps also 300 and found the main application in electronics.
Ferrite is a class of ceramic material with useful electromagnetic properties and an interesting history. Ferrite is rigid and brittle. Like other ceramics, ferrite can chip and break if handled roughly. Luckily it is not as fragile as porcelain and often such chips and cracks will be merely cosmetic. Ferrite varies from silver gray to black in color. The electromagnetic properties of ferrite materials can be affected by operating conditions such as temperature, pressure, field strength, frequency and time.
There are basically two varieties of ferrite: soft and hard. This is not a tactile quality but rather a magnetic characteristic. 'Soft ferrite' does not retain significant magnetization whereas 'hard ferrite' magnetization is considered permanent. Fair-Rite ferrite materials are of the 'soft' variety.
Ferrite has a cubic crystalline structure with the chemical formula MO.Fe2O3 where Fe2O3 is iron oxide and MO refers to a combination of two or more divalent metal (i.e: zinc, nickel, manganese and copper) oxides. The addition of such metal oxides in various amounts allows the creation of many different materials whose properties can be tailored for a variety of uses.
Ferrite components are pressed from a powdered precursor and then sintered (fired) in a kiln. The mechanical and electromagnetic properties of the ferrite are heavily affected by the sintering process which is time-temperature-atmosphere dependent.
Ferrite shrinks when sintered. Depending on the specific ferrite, this shrinkage can range from 10% to 17% in each dimension. Thus the unfired component's volume may be as much as 60% larger than the sintered value. Maintaining correct dimensional tolerances as well as the prevention of cracking and warpage related to this shrinkage are fundamental concerns of the manufacturing process.
Ferrite bead, a passive electronic device used to limit interference
Ferrite core memory, a type of computer memory based on tiny tori of ferromagnetic materials
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