How Did a Magnet Evolve into Ferrite?
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How Did a Magnet Evolve into Ferrite?

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Ferrite magnets are widely used in electroacoustics, telecommunications, electricity meters, motors and other fields, and can also be used as passenger boarding certificates and ticket price settlement for computers and magnetic cards such as memory components and microwave components. The following focuses on the application and principle of magnetic materials on magnetic tapes.

  • What is the definition of ferrite magnet?

  • What is the method of producing ferrite magnets?

  • How did a magnet evolve into ferrite?

What is the definition of ferrite magnet?

Ferrite magnet (ceramic magnet) is made by calcining the mixture of iron oxide (Fe2O3) and strontium carbonate (SrCO3) or barium carbonate (BaCO3) (1000 to 1350 ℃) to form metal oxide. In some qualities, other chemicals such as cobalt (CO) and lanthanum (LA) are added to improve magnetism. The metal oxide is then ground into small particles (less than 1 mm, usually several microns). Then, depending on the type of magnet required, the process has two main production options.

Ferrite Magnets

What is the method of producing ferrite magnets?

Dense magnets ("green" magnets) are sintered (between 1100 and 1300 degrees Celsius) to melt particles. If final machining is to be performed, use a diamond tool (thread spark etching does not work because the ferrite is electrically insulated). The pole surface is usually machined/ground to the required finish, while other surfaces are sintered. Magnets shall be cleaned and dried before being magnetized to saturation, and then inspected and packaged for shipment to the customer.

Wet pressed ferrite magnets have better magnetism, but are more likely to have larger dimensional tolerances. The magnetic properties of dry anisotropic hard ferrite magnets are lower than those of wet anisotropic hard ferrite magnets.

How did a magnet evolve into ferrite?

At the beginning

The earliest mention of magnets can be traced back to more than 2500 years ago, when the Greeks discovered and used magnets, although early civilizations may also have used natural magnets. The word "magnet" actually comes from the Greek word "Magnetis lithos", which means "magnesite" and refers to the area where stones are found in modern Türkiye.

From accident to mass production

The earliest navigators and explorers in the world used these magnets to locate the magnetic North Pole of the Earth. In 1600, William Gilbert published the first magnetic science research report, named Demanette. Until 1930, the first batch of ceramic magnets, also known as ceramic magnets, were accidentally produced by two Japanese professors at Tokyo Institute of Technology, Dr. Yokoro Kato and Dr. Takeshi Takei. In the 1950s, large-scale production of ceramic magnets began to be used as substitutes for metal magnets, and now they are widely used in electronic inductors, transformers and electromagnets. They also largely replaced the early development of alnico magnets as radio magnets in loudspeakers.

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