About ceramic magnet, many people do not know it belongs to which kind of magnet? Today, this article will introduce to you the material type, shape, application and its performance parameters of ceramic magnets.
Ceramic magnets, also known as hard ferrite magnets, are composed of barium or strontium and were developed in the early 1960s as an alternative to more expensive metal magnets. These magnets are very hard, brittle, and have low energy properties compared to other magnetic materials. However, ceramic ferrite magnets are widely used due to their excellent demagnetization and corrosion resistance properties and superior price advantage.
Ferrite magnets are manufactured by sintering or injection molding. These magnets can be anisotropic and isotropic. Anisotropic grades are oriented in the direction of manufacture and must be magnetized in that direction. Isotropic grades are not oriented and can be magnetized in any direction.
Ceramic magnets can maintain 45% of their room temperature magnetic specification at 350 degrees Fahrenheit. The degradation is nearly linear as the temperature increases and the change in magnetization is essentially reversible until about 840°F, at which temperature the ceramic magnet is completely demagnetized. Ceramic magnets exposed to temperatures up to 1800 degrees Fahrenheit can be remagnetized for continued use. However, above 1800 degrees Fahrenheit, the changes are irreversible.
Ceramic ferrite magnets are commonly used in shapes such as arc (tile), rectangle, square, torus, and cylinder.
Applications for ceramic magnets include: loudspeakers, DC brushless motors, magnetic resonance imaging, magnetic separation for magnetic assemblies designed for lifting, holding and recycling.
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