What is a Ceramic Magnet?
Ceramic Magnets are also known as Hard Ferrite Magnets, are 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.
Sintering, or injection molding manufactures ferrite magnets. 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 are requested for ceramic magnets. If the shape you're looking for isn't listed below, then fill out our custom form!
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
Magnetism Direction Options
We can offer several different magnetization directions, see below schematics. Their availability is limited to size. Magnetization fixture cost may apply for large and custom magnets with magnetization other than what is shown below
Ceramic Magnet Grades & Properties
|Grade||Residual Induction Br (max)|
|Max Energy Product BH (max)|
|Coercive Force Hcb|
|Temp. Coe of Br|
|Max. Practical Operating|
Br: Residual Induction
Hc: Coercive Force
˚C: Degree Celcius
MGOe: Mega Gauss Oersted
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)