Ceramic (Hard Ferrite) Magnets

Ferrite magnets, sometimes referred to as ceramic because of their production process, are the least expensive class of permanent magnet materials. The material became commercially available in the mid 1950’s and has since found its way into countless applications including arc shaped magnets for motors, magnetic chucks and magnetic tools.

The raw material – iron oxide – for these magnets is mixed with either strontium or barium and milled down to a fine powdered form. The powder is then mixed with a ceramic binder and magnets are produced through a compression or extrusion molding technique that is followed by a sintering process. The nature of the manufacturing process results in a product that frequently contains imperfections such as cracks, porosity, chips, etc. Fortunately, these imperfections rarely interfere with a magnet’s performance.

To enhance a ceramic magnet’s performance, the ferrite compound may be biased by a magnetic field during the pressing process. This biasing induces a preferred direction of magnetization within the magnet, significantly reducing its performance in any other orientation. Consequently, ceramic magnets are available in both oriented (anisotropic) and non-oriented (isotropic) grades. Because of its lower magnetic properties, the isotropic grade of ferrite, ceramic 1, is typically utilized where complex magnetization patterns are required, and in process biasing would be cost prohibitive.

Ceramic magnets are inherently brittle, and it is highly recommended that they NOT be utilized as structural elements in any application. Their thermal stability is the poorest of all the magnetic families, but they may be utilized in environments up to 300 °C (570 °F). The dimensional repeatability of as pressed components is difficult to control, consequently, components requiring tight tolerances necessitate secondary grinding operations to assure conformity.

Grade(Click to view demagnetization curve)
Max Energy Product
Residual Induction
Min Intrinsic Coercivity
Coercivity
Max Operating Temp
Curie Temp
Coefficient Induction 20-150°C
Coefficient Coercivity 20-150°C
 
BHmax
Br
Hci
Hc
Tmax
Tc
α
β
 
MGOe
kG
kOe
kOe
°C
°C
% / °C
% / °C
1.1
2.3
3.2
2.0
250
450
-0.20
0.35
3.4
3.8
2.5
2.4
250
450
-0.20
0.35
2.8
3.4
4.0
3.1
250
450
-0.20
0.35
3.5
3.85
3.1
2.9
250
450
-0.20
0.35
3.5
3.8
3.9
3.45
250
450
-0.20
0.35
4.0
4.1
2.9
2.85
250
450
-0.20
0.35
3.3
3.7
4.8
3.5
250
450
-0.20
0.35
3.8
4.0
4.0
3.6
250
450
-0.20
0.35

Typical Physical Properties
Curie Temperature
450 - 460°C
Coefficient of Thermal Expansion
+7.0 - +15.0 x 10-6 °C-1
Electrical Resistivity
10 µΩ·cm
Density
4.5 - 5.1 g·cm-3
Vicker's Hardness
480 - 580 HV
Young's Modulus
170 kN·mm-2
Bending Strength
0.05 - 0.09 kN·mm-2
Compressive Strength
1.3 kN·mm-2
Tensile Strength
0.02 - 0.05 kN·mm-2