Ceramic Magnets,--Ceramic Discs magnets,Ceramic Blocks magnets,Ceramic Rings magnets,Ceramic Arcs magnets

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CERAMIC MAGNETS

Ceramic (ferrite) magnets are composed of strontium carbonate and iron oxide. They are charcoal gray in color and usually appear in the forms of discs, rings, blocks, cylinders, and sometimes arcs for motors.

Attributes of Ceramic Magnets

High intrinsic coercive force
Tooling is expensive
Least expensive material compared to alnico and rare earth magnets
Limited to simple shapes due to manufacturing process
Lower service temperature than alnico, greater than rare earth
Finishing requires diamond cutting or grinding wheel
Lower energy product than alnico and rare earth magnets
Most common grades of ceramic are 1, 5 and 8 (1-8 possible)
Grade 8 is the strongest ceramic material available

Ceramic Blocks

Ceramic Discs

Ceramic Rings

Applications of Ceramic Magnets
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, retrieving, and separating.

Typical Magnetic and Physical Properties of Ceramic Magnet Material

Magnetic Materials	Density		Maximum Energy Product BH (max)	Residual Induction Br	Coercive Force Hc	Intrinsic Coercive Force Hc	Normal Maximum Operating Temp.		Curie Temp.
Magnetic Materials	lbs/in	g/cm	MGO	Gauss	Oersteds	Iersteds	F°	C°	F°	C°
Ceramic 1	0.177	4.9	1.05	2300	1860	3250	842*	450	842	450
Ceramic 5	0.177	4.9	3.4	3800	2400	2500	842*	450	842	450
Ceramic 8	0.177	4.9	3.5	3850	2950	3050	842*	450	842	450

All magnet materials demonstrate reversible strength loss as they approach Maximum Operating Temperature.
* NOTE: Unshielded open circuit ceramic magnets should not be subjected to more than 400°F.

Tolerances
For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater. According to IMA standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of pole surface.

Magnetizing and Handling
Ceramic magnet material is extremely brittle and can chip or break if dropped on a hard surface, or if allowed to “jump at” an attracting object. Handle with care. The weakest grade of ceramic material is grade 1, which is typically non-oriented. Grades 5 and 8 are oriented ceramic material. Grade 8 is the strongest ceramic magnet material available (Refer to properties chart below). When making magnetic assemblies with ceramic, it is typically easier for production purposes to magnetize the product after assembly.

Machining
Since ceramic material is so brittle, it requires special machining techniques and equipment. We are fully equipped to cut and grind ceramic material to your specifications.