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Available Ceramic Magnet Grades

Magnetic and Physical Characteristics

The range of Ceramic magnet alloy grades available from Dura Magnetics typically extends from 1.05 – 3.8 MGOe.  This range allows for optimizing the cost, performance, and operational temperature resistance for a wide range of applications.

Ceramic magnets have the lowest Energy Density of the commercially viable alloys, but are by far the most cost effective.  Oftentimes sacrificing “space” and using more Ceramic / ferrite magnet alloy is a very good-trade-off for the low cost.  As with all magnet alloys, Ceramic magnets should not be used as structural elements.  They are very inherently brittle and will fracture or chip easily when mechanically stressed.

Ceramic / Strontium Ferrite Magnets - Available Grades
Dura
Magnet
Grade
Residual
Induction
Br
Coercive
Force
Hc
Intrinsic
Coercive
Force
Hci
Maximum
Energy
Product
(BH)max
Max.
Operating
Temp.*
NominalNominalMinimumNominalNominal
k-GaussTeslak-OerstedkA/mk-OerstedkA/mMGOekJ/m3°C°F
Ceramic 12.3
2301.860
148
3.500
278
1.05
8.4
250°482°
Ceramic 53.9390
2.400
200
2.500
198
3.4
27.6
250°482°
Ceramic 83.9
390
3.000
240
3.200
256
3.4
27.6
250°482°
Ceramic 8B 4.04003.0002403.0502443.830.4250°482°
* The listed maximum operating temperatures are based on an adequate Length to Diameter ratio or a properly designed magnetic circuit. The listed values are for reference and validation must occur before one chooses a design path. Please consult a Dura technical representative before selecting or designing with Ceramic magnet alloy.
Reversible Temperature Coefficient - Ceramic (Strontium Ferrite) Magnets
Temperature Range
(°C)
Induction Br (α)
(%)/°C

Intrinsic Coercivity Hci (β)
(%)/°C
20°C to 150°C-0.2 to -0.3
0.2 to 0.5
α = Δ Br / Δ T * 100 (Br @ 20°C) [ΔT = 20°C - 150°C]
β = Δ Hci / Δ T * 100 (Hci @ 20°C) [ΔT = 20°C - 150°C]
Ceramic Magnets - Physical Properties
PropertyUnitsValue Ceramic (Strontium Ferrite)
Vickers HardnessHv~ 1160 (7 Mohs)
Densityg/cm34.5 to 5.1
Curie Temp TC°C450 to 460
Curie Temp TF°F840 to 860
*Specific ResistanceμΩ⋅Cm> 106
Bending StrengthkN/mm20.05 - 0.09
Tensile StrengthkN/mm2.02 to .05
Thermal Expansion (∥)°C-1+11.0 to +16.0 x10-6
Thermal Expansion (⊥)°C-1'+7.0 to +15.0 x 10-6
The listed values are approximate and should be used as a reference. Any magnetic or physical characteristics should be substantiated before selecting a magnet material. Please engage Dura's Design / Development team members before selecting a design path.
* The effective resistance may change based on the powder blend. Barium Ferrite has higher resistivity than Strontium Ferrite. Some Ceramic magnets are a blend. To ensure the correct design path is chosen execute due diligence by evaluating the magnet alloy on a case by case basis.

The listed values are approximate and should be used as a reference.  Any magnetic or physical characteristics should be substantiated before selecting a magnet material.  Please engage Dura’s Design / Development team members before selecting a design path.

Did You Know?

Licenses are required to produce and sell Neodymium. Make sure your source is supplying you with your license.

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