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Ferrite magnets


Characteristics of magnets

Iron oxide is used as the main material of these ceramic magnets, with strontium carbonate or barium carbonate used as an auxiliary material. These magnets are also manufactured by powder metallurgy.

Ferrite magnets offer the most excellent cost performance of all magnets. Made of ceramics, these magnets are advantageous in terms of chemical stability and not being subject to rust. Since the temperature changes of Br are relatively large, these magnets require a design that allows for the temperature environment. The temperature changes of Hcj are opposite those of rare-earth magnets and other metal magnets, thereby requiring sufficient caution regarding demagnetization at low temperature.
Ferrite magnets
As for cut products, we can cut the base material to the dimensions desired by magnet users. Since grinding is employed, no mold is necessary, thereby making a speedy response possible both in prototyping and mass production.
The maximum dimensions of the base material are 150 x 100 x 25.4 (mm).
*1: 25.4 mm in the direction of magnetic field

(1) Base material can be cut to the type W or type D.
Base material Type W Type D
(2) We can supply molds for ring-type, segment-type or other types of products needed by our clients by taking full advantage of our domestic and international network. Molds can be manufactured at surprisingly low cost.




Characteristic data (material characteristic data)
Characteristics of magnets | Characteristic data |Demagnetization curve
Physical characteristics of magnet | Manufacturing process

Ferrite
GRADE
Residual flux density (Br)
kG/T
Magnetic coercive force (BH) max
MGOe/kJ/m3
(Hcb)
kOe/kA/m
(Hcj)
kOe/kA/m
Rrsidual Induction Coercive Force Max.Energy Product
Isotropic 2.2
0.22
1.8
148
  1.0
8.0
Dry and anisotropic 3.7
0.37
2.8
224
3.0
240
3.2
25.6
Wet and anisotropic 4.05
0.405
3.62
288
4.06
323
3.7
29.5
4.0
0.4
3.1
24.7
3.15
251
3.75
29.8
4.05
0.405
3.75
298
4.05
322
3.9
31.0
4.0
0.4
2.8
224
2.85
228
4.0
31.8
4.2
0.42
2.96
235
3.02
240
4.2
33.4
4.2
0.42
3.8
303
4.0
319
4.2
33.4



Demagnetization curve
Characteristics of magnets | Characteristic data |Demagnetization curve
Physical characteristics of magnet | Manufacturing process

Demagnetization curve



Physical characteristics of magnet
Characteristics of magnets | Characteristic data |Demagnetization curve
Physical characteristics of magnet | Manufacturing process
  Temp. coefficient
Density
Curie Temp.
Vickers
hardness
Working Temp.
  (20°C - Tw) (D) (Tc) (HV) Tw
  αBr αH        
  -%/°C -%/°C g/cm3 °C   °C
Wet and anisotropic
Sr-Ferrite
0.2 0.2-0.5 4.5-5.1 460 530 -



Manufacturing process
Characteristics of magnets | Characteristic data |Demagnetization curve
Physical characteristics of magnet | Manufacturing process
Manufacturing process
 

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