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Hard Ferrite (ceramic) magnets, composed of barium or strontium, were developed in the early 1960's as an alternative to the more expensive metallic magnets. This class of magnet is very hard, brittle and possesses lower energy characteristics compared to other magnetic materials. However, ceramic ferrite magnets are very popular and widely used because of its excellent resistance to demagnetization, corrosion, and the advantageous pricing.

Ceramic Magnets

Sintering, or injection molding manufactures ferrite magnets. These magnets can be both anisotropic and isotropic. Anisotropic grades are oriented in the manufacturing direction and must be magnetized in the direction of orientation. Isotropic grades are not oriented and can be magnetized in any direction.

Ceramic magnets retain about 45% of their room-temperature magnetic specifications at 350 °F. Degradation with increasing temperature is nearly linear, and changes in magnetization are essentially reversible up to approximately 840 °F, at which temperature ceramic magnets become completely demagnetized. Ceramic magnets exposed to temperatures up to 1800 °F can be remagnetized for continued use. However, changes are irreversible above 1800 °F.

Ceramic 5 magnets are the most commonly used and must be magnetized in the direction of their orientation.

Ceramic 8 magnets are used for their excellent peak energy product and greater resistance to demagnetization than Ceramic 5 magnets. They also must be magnetized in the direction of their orientation. Ceramic 8 is an excellent choice wherever magnet length is at minimum or where the magnetic circuit is subject to severe demagnetizing field. See table below for grades and properties of Ceramic magnets.

Ceramic Ferrite Magnet Shapes

Magnetic Hold can manufacture ceramic magnets in a wide variety of shapes. Below is a list of the most popular and common shapes that're requested for ceramic magnets. If the shape you're looking for isn't listed below, then fill out our custom form!

  • Ring
  • Block
  • Disc
  • Bar

Ceramic Magnet Applications

  • Speaker magnets
  • DC brushless motors
  • Magnetic Resonance Imaging (MRI)
  • Magnetos used on lawnmowers and outboard motors
  • DC permanent magnet motors (used in cars)
  • Separators (separate ferrous material from non-ferrous)
  • Used in magnetic assemblies designed for lifting, holding, and retrieving
  • Reed switches

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Ceramic Magnet Grades & Properties

GradeBr
[Gs]
Hc
[Oe]
(Bd Hd) max
MGOe
Curie Temp.
[˚F]
Temp. Coe
[%/˚F)
Max. Practical Operating
Temp. [˚F]
Ceramic 1 2000 1600 0.80 842 0.11 392
Ceramic 5 3900 2500 3.40 842 0.11 392
Ceramic 8 3900 3000 3.40 842 0.11 392

Br: Residual Induction
Gs: Gauss
Hc: Coercive Force
Oe: Oersted
Bd Hd: Maximum Energy Product
˚F: Degree Fahrenheit

Standard Tolerances (inches);
Rod - Diameter (±0.002), Length (±0.005)
Rectangle – Length & Width (±0.01), Thickness (±0.005)
Ring – Outside Diameter (±0.002), Inside Diameter (±0.02), Thickness (±0.005)


Magnetism Direction Options

  • Round Sintered Ceramic magnet can be magnetized with two poles ("N" & "S") the thickness, diametrically and with multiple poles.
  • Ring Sintered Neodymium magnet can be magnetized with two poles ("N" & "S") thru the thickness, diametrically and with multi poles. Contact us for magnetism direction of irregular shapes.
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