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They offer an excellent cost performance
and are made mainly from Fe2O3(Iron Oxide)
and BaCO3(Barium carbonate) or SrCO3(Strontium
carbonate). These magnets are formed by power
metallurgy. There are two types of magnet:
the Isotropic magnet, molded in the absence
of a magnetic field and the Anisotropic magnet,
which has out standing properties in the direction
of the field.
These two types magnets are also divided as
wet and dry type by using water or not in
producing. Dry process will be adopted when
production of small size or small quantity
is required because of the ease of tool change
and the lower cost in developing toolings
than wet process, even though it has a weak
point of lower magnetic properties than those
of wet.
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¢º-
One Magnetic Direction
¢º- Simple
Shape, Big size
¢º- High
Tooling Charge
¢º- High
Price comparing as Isotropic Magnet
¢º- Magnetic
Property
¢º .Residual
Flux Density (Br) : 4,000 (G)
¢º .Coercive
Force (Hc) : 3,000 (Oe)
¢º .
Maximum Energy ((BH)max) : 4.0 MGOe
¢º .Density
(g/§¨) : 4.6 ~ 5.1
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¢º-
Many Magnetic direction
¢º- Complex
Shape, Small Size
¢º- Low
tooling Charge
¢º- Low
Price
¢º- Magnetic
Property
¢º..Residual
Flux Density (Br) : 2,100 (G)
¢º .Coercive
Force (Hc) : 2,000 (Oe)
¢º .Maximum
Energy ((BH)max) : 1.1 MGOe
¢º .Density
(g/§¨) : 4.6 ~ 5.1
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MATERIAL
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REMANENCE
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COERCIBITY
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MAX.
ENERGY PRODUCT
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NOTE
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Br(G)
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bHc(Oe)
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iHc(Oe)
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(BH)max
MGOe
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MATERIAL
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PROCESS
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BA
- 1
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2200
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1900
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3300
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1.1
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ISOTROPIC
Ba-FERRITE
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DRY
PRESS
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SA
- 1
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2200
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2000
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3200
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1.1
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ISOTROPIC
Sr-FERRITE
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DRY
PRESS
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SR
- 1
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3700
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2800
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3000
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3.2
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ANISOTROPIC
Sr-FERRITE
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DRY
PRESS
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SR
- 3
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4000
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2800
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2850
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4.0
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ANISOTROPIC
Sr-FERRITE
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DRY
PRESS
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SR
- 4H
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3900
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3500
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3600
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3.7
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ANISOTROPIC
Sr-FERRITE
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DRY
PRESS
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SR
- 4B
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4100
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2900
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2950
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4.2
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ANISOTROPIC
Sr-FERRITE
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DRY
PRESS
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| With their high coercive force Ferrite
magnets are difficult to demagnetize when subjected
to an external magnetic field. Because the properties
listed in underneath table change somewhat with
the shape and size of the magnet. |
