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Ferrite Magnet, which is featuring high coercive force, is used in wide range of applications including speakers, communication equipments, motors, relays, sensors, etc. |
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■Standard Material Characteristics and Applications
There is no substantial difference between isotropic and anisotropic Ferrite Magnets. However,Anisotropic Ferrite Magnet is manufactured by rotating particle of micro powder by imposing external magnetic fields on them while molding the press and then forming crystalomagnetic axis in line according to the direction of the press. Therefore Anisotropic Ferrite Magnet is drastically improved in magnetic performance compared with Isotropic Ferrite Magnet. Its magnetic energy per unit weight is equal to that of cast magnets.
Wet Anisotropic Ferrite Magnet is manufactured by pressing mud powder within magnetic field.
These magnets are classified into the following categories: Q6 (Barium type), SR-1H, SR-2H,SR-1, and SR-3 (Strontium type). When you design magnetic circuit including magnets, if there is a large opening in the circuit, or the circuit receives great influence from external magnetic fields, or occurrence of irreversible demagnetization at considerably low temperature must be avoided, we suggest using SR-1H, SR-2H, SR-1, or SR-2 with great coercive force. When you need high magnetic flux density, we suggest you use SR-3 which has large energy product.
SR-30, SR-40 and SR-40S are Dry Anisotropic Ferrite Magnets which are manufactured by pressing dry magnetic powder in magnetic fields and ideal for mass production of small-sized products. |
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■Standard Material Characteristics
| Material |
Classification |
Residual flux density
Br
T
(G) |
Coercive force
BHC
kA/m
(Oe) |
Maximum energy product
(BH)max
kJ/m3
(MGOe) |
Density
g/cm3 |
Curie
temperature
(ºC) |
Thermal expansion
coefficient
10-5/ºC |
| Q2 |
Isotropic |
Ba type |
0.20~0.24
(2000~2400)
|
127~160
(1600~2000) |
7.1~10.4
(0.9~1.3) |
4.9~5.0 |
460 |
0.9~1.5 |
| Q6 |
Wet Anisotropic |
Ba type |
0.40~0.43
(4000~300) |
143.3~175
(1800~2200) |
28.8~32.0
(3.6~4.0) |
5.0~5.2 |
450 |
0.9~1.5 |
| SR -1H |
Wet Anisotropic |
Sr type |
0.34~0.37
(3400~3700) |
254~279
(3200~3500) |
22.4~27.2
(2.8~3.4) |
4.75~4.95 |
460 |
0.9~1.5 |
| SR - 2H |
Wet Anisotropic |
Sr type |
0.38~0.41
(3800~4100) |
262~287
(3300~3600) |
27.0~32.0
(3.4~4.0) |
4.75~4.95 |
460 |
0.9~1.5 |
| SR -1 |
Wet Anisotropic |
Sr type |
0.36~0.40
(3600~4000) |
223~263
(2800~3300) |
2.40~28.8
(3.0~3.6) |
4.7~4.9 |
460 |
0.9~1.5 |
| SR -2 |
Wet Anisotropic |
Sr type |
0.38~0.41
(3800~4100) |
223~263
(2800~3300) |
27.2~32.0
(3.4~4.0) |
4.8~5.0 |
460 |
0.9~1.5 |
| SR -3 |
Wet Anisotropic |
Sr type |
0.41~0.43
(4100~4300) |
215~247
(2700~3100) |
32.0~35.2
(4.0~4.4) |
4.8~5.0 |
460 |
0.9~1.5 |
| SR -30 |
Dry Anisotropic |
Sr type |
0.34~0.38
(3400~3800) |
222~255
(2800~3200) |
20.6~24.5
(2.6~3.2) |
4.8~5.0 |
460 |
0.9~1.5 |
| SR -40 |
Dry Anisotropic |
Sr type |
0.36~0.39
(3600~3900) |
218~251
(2750~3150) |
23.0~27.9
(2.9~3.5) |
4.9~5.1 |
460 |
0.9~1.5 |
| SR -40S |
Dry Anisotropic |
Sr type |
0.38~0.41
(3800~4100) |
214~247
(2700~3100) |
27.0~31.9
(3.4~4.0) |
4.9~5.1 |
460 |
0.9~1.5 |
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■Substance Characteristics
| Items |
Ranges |
| Specific heat |
(J/kg·K) |
630~840 |
| Thermal conductivity |
(W/m·K) |
~5.8 |
Transverse strength
|
(Kgf/cm2) |
5~9 |
Tensile strength
|
(Kgf/cm2) |
2~5 |
| Thermal expansion coefficient |
(10-6/ºC) |
Anisotropic direction 14~15 |
| Anisotropic square direction 9~10 |
| Temperature coefficient |
(ΔBr/Br/ºC) |
-0.18~-0.20 |
| (ΔHc/Hc/ºC) |
+0.20~+0.50 |
Vickers hardness
|
|
400~700 |
Electrical resistance
|
(Ω·cm) |
>104 |
| Recoil permeability |
(μ rec) |
1.05~1.20 |
Magnetizing power
required for magnetization |
(KOe) |
10 |
| (A/m) |
796 |
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COPYRIGHT 2009 MARUWA Co., Ltd. ALL RIGHT RESERVED.
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