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The introduction of isotropic ferrite and anisotropic ferrite

You can't tell from the appearance. The isotropic when pressing (dry pressing or wet pressing), there is a magnetic field, so that the easy magnetization axis of the magnetic powder is aligned. The anisotropic is about 3 times more than the isotropic one. The isotropic is easier than the anisotropic when making. Therefore, the tooling cost and unit price of the isotropic magnets is cheaper, but the magnetic force is much weaker.

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Ferrite Magnet Grade List

Chinese Standard

 Type
Grade  Br  Hcb  Hcj (BH)max  Tw
KGs mT KOe KA/m

KOe

KA/m MGOe KJ/m³ (℃)
 

Chinese

Standard
 

 

Y10T 2.00-2.35 200-235 1.60-2.01 125-160 2.60-3.52   210-280 0.8-1.2 6.50-9.50 ≤ 300
Y20 3.60-3.80 360-380 1.70-2.38 135-190

1.76-2.45

140-195 2.5-2.8 20.00-22.00 ≤ 300
Y25 3.80-3.90 380-390 1.80-2.14 144-170

1.88-2.51

150-200 3.0-3.5 24.00-28.00 ≤ 300
Y30 3.90-4.10 390-410 2.30-2.64 184-210

2.35-2.77

188-220 3.4-3.8 27.60-30.00 ≤ 300
Y30BH 3.90-4.10 390-410 3.00-3.25 240-250

3.20-3.38

256-259 3.4-3.7 27.60-30.00 ≤ 300
Y35 4.10-4.30 410-430 2.60-2.75 208-218

2.60-2.81

210-230 3.8-4.0 30.40-32.00 ≤ 300
Physical properties of Ferrite
Parameter Ferrite Magnets
Curie temperature(℃) 450
Maximum operating temperature(℃) 250
Hv(MPa) 480-580
Density(g/cm³) 4.8-4.9
Relative recoil air permeability(urec) 1.05-1.20
Saturation field strength, kOe(kA/m) 10(800)
Br(%/℃) -0.2
iHc(%/℃) 0.3
Tensile  strength(N/mm) <100
Transverse breaking strength(N/mm) 300

Application

Ferrite magnet is one of most widely used magnet in the world, it is mainly used in the field of PM motor and loudspeaker, also other filed like permanent magnet hanger, magnetic thrust bearing, broadband magnetic separator, loudspeaker, microwave equipment, magnetic therapy sheets, hearing AIDS and so on.

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