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CERAMIC MAGNETS

Ceramic Magnets

Allstar Magnetics offers an array of ceramic magnets. Ceramic (ferrite) permanent 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.

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Ceramic Magnets

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

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.

Physical Properties

Magnetic Materials
Density
Maximum
Energy
Product
BH (max)
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hc
Normal
Maximum
Operating
Temp.
Curie
Temp.
lbs/in
g/cm
MGO
Gauss
Oersteds
Iersteds
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 & 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.

 

GradeBr (KGs)Hc (KOe)Hci (KOe)BHmax (MGOe)
C1 2.3 1.86 3.25 1.05
C5 3.8 2.4 2.5 3.4
C8 3.85 2.95 3.05 3.50
C8A 3.9 3.2 3.25 3.5
C8B 4.0 2.8 2.95 3.9
C10 3.9 3.24 3.38 3.7