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Sintered Ferrite
Magnet was developed
since 1960s. It is
manufactured from
Oxide material by
Powder metallurgical
process. According
to the difference in
molding process, it
can be divided into
Dry Type and Wet
Type ferrite
magnets. According
to the inner
structure of the
material, it can be
divided into
Anisotropic Ferrite
Magnet and Isotropic
Ferrite Magnet. It
is considered a
fundamental magnetic
material, for it is
widely used in many
fields owing to its
good magnetic
performance and the
low cost of its raw
material. In various
applications, it can
not be replaced,
although many new
magnetic materials
came out in recent
years.
Hard Ferrite magnets
have excellent
corrosion resistance
and have normal
operating
capabilities between
-40°C and +250°C. As
temperature
increases, remanence
decreases by 0.2%/°C
whereas coercivity
increases by
0.3%/°C. At very low
temperatures there
is a risk of
permanent
demagnetization in
magnet systems with
low working points.
Permanent ferrite
magnet is made of
Sro or Bao and Fe2O3
by ceramic
processing
technology, now, we
have 6 models of
permanent magnet
products, namely
Y10T, Y20, Y25, Y30,
Y30BH, Y35 and etc.
The products include
rings, disks,
blocks, and
segments.
We have a wide
variety of standard
parts, and we
welcome the
opportunity to quote
on your specific
requirements.
Chinese grade for
sintered ferrite
magnets
|
Grade |
Br
mT KG |
Hcb
KA/m KOe |
Hcj
KA/m KOe |
(BH)max KJ/m3
MGOe |
Equivalent
to
Former
standard |
|
Y8T |
200-235
2.0-2.35 |
125-160
1.57-2.01 |
210-280
2.64-3.52 |
6.5-8.5
0.8-1.2 |
Y10T |
|
Y20 |
320-380
3.2-3.8 |
135-190
1.70-2.58 |
140-195
1.76-2.45 |
18.0-22.0
2.3-2.8 |
Y20 |
|
Y22H |
310-360
3.1-3.6 |
220-250
2.77-3014 |
280-320
3.52-4.02 |
20.0-24.0
2.5-3.0 |
|
|
Y23H |
320-370
3.2-3.7 |
170-190
2.14-2.38 |
190-230
2.39-2.89 |
20.0-25.5
2.5-3.2 |
|
|
Y25 |
360-400
3.6-4.0 |
135-170
1.70-2.14 |
140-200
1.76-2.51 |
22.5-28.0
2.8-3.5 |
Y25 |
|
Y26H |
360-390
3.6-3.9 |
220-250
2.77-3.14 |
225-255
2.83-3.21 |
23.0-28.0
2.9-3.5 |
|
|
Y27H |
370-400
3.7-4.0 |
205-250
2.58-3.14 |
210-255
2.64-3.21 |
25.0-29.0
3.1-3.7 |
|
|
Y28 |
370-400
3.7-4.0 |
175-210
2.20-2.64 |
180-220
2.26-2.77 |
26.0-30.0
3.3-3.8 |
Y30 |
|
Y30H-1 |
380-400
3.8-4.0 |
230-275
2.89-3.46 |
235-290
2.95-3.65 |
27.0-32.5
3.4-4.1 |
Y30BH |
|
Y30H-2 |
395-415
3.95-4.15 |
275-300
3.46-3.77 |
310-335
3.90-4.21 |
28.5-32.0
3.5-4.0 |
|
|
Y32 |
400-420
4.0-4.2 |
160-190
2.01-2.38 |
165-195
2.07-2.45 |
30.0-33.5
3.8-4.2 |
Y35 |
|
Y33 |
410-430
4.1-4.3 |
220-250
2.77-3.14 |
225-255
2.83-3.21 |
31.5-35.0
4.0-4.4 |
|
USA standard
|
Material
|
Br
|
HcB
|
HcJ
|
(BH)max
|
|
mT
|
KG
|
KA/m
|
KOe
|
KA/e
|
KOe
|
kj/m3
|
MGOe
|
|
C1
|
230
|
2.3
|
148
|
1.86
|
258
|
3.5
|
8.36
|
1.05
|
|
C5
|
380
|
3.8
|
191
|
2.4
|
199
|
2.5
|
27
|
3.4
|
|
C7
|
340
|
3.4
|
258
|
3.23
|
318
|
4.00
|
21.9
|
2.75
|
|
C8(=C8A)
|
385
|
3.85
|
235
|
2.95
|
242
|
3.05
|
27.8
|
3.5
|
|
C8B
|
420
|
4.2
|
232
|
2.913
|
236
|
2.96
|
32.8
|
4.12
|
|
C9
|
380
|
3.8
|
280
|
3.516
|
320
|
4.01
|
26.4
|
3.32
|
|
C10
|
400
|
4.0
|
288
|
3.617
|
280
|
3.51
|
30.4
|
3.82
|
|
C11
|
430
|
4.3
|
200
|
2.512
|
204
|
2.56
|
34.4
|
4.32
|
Europe
standard
The standard from
International
Electronics
Committee(IEC404-8-1)
|
Grade
|
Allowed
Value
(min/typical)
|
|
Br
|
Hcb(BHC)
|
Hcj(IHC)
|
(BH)max
|
|
MT
|
KG
|
KA/m
|
KOe
|
KA/m
|
KOe
|
Kj/m3
|
MGOe
|
|
HF8/22
|
200/220
|
2.00/2.20
|
125/140
|
1.57/1.76
|
220/230
|
2.76/2.89
|
6.5/6.8
|
0.8/1.1
|
|
HF20/19
|
320/333
|
3.20/3.33
|
170/190
|
2.14/2.39
|
190/200
|
2.39/2.51
|
20.0/21.0
|
2.5/2.7
|
|
HF20/28
|
310/325
|
3.10/3.25
|
220/230
|
2.76/2.89
|
280/290
|
3.52/3.64
|
20.0/21.0
|
2.5/2.7
|
|
HF22/30
|
350/365
|
3.50/3.65
|
255/265
|
3.20/3.33
|
290/300
|
3.64/3.77
|
22.0/23.5
|
2.8/3.0
|
|
HF24/16
|
350/365
|
3.50/3.65
|
155/175
|
1.95/2.20
|
160/180
|
2.01/2.26
|
24.0/25.5
|
3.0/3.2
|
|
HF24/23
|
350/365
|
3.50/3.65
|
220/230
|
2.76/2.89
|
230/240
|
2.89/3.01
|
24.0/25.5
|
3.0/3.2
|
|
HF24/35
|
360/370
|
3.60/3.70
|
260/270
|
3.27/3.39
|
350/360
|
4.40/4.52
|
24.0/25.5
|
3.0/3.2
|
|
HF26/16
|
370/380
|
3.70/3.80
|
155/175
|
1.95/2.20
|
160/180
|
2.01/2.26
|
26.0/27.0
|
3.2/3.4
|
|
HF26/18
|
370/380
|
3.70/3.80
|
175/190
|
2.20/2.39
|
180/190
|
2.26/2.39
|
26.0/27.0
|
3.3/3.4
|
|
HF26/24
|
370/380
|
3.70/3.80
|
230/240
|
2.89/3.01
|
240/250
|
3.01/3.14
|
26.0/27.0
|
3.3/3.4
|
|
HF26/26
|
370/380
|
3.70/3.80
|
230/240
|
2.89/3.01
|
260/270
|
3.27/3.39
|
26.0/27.0
|
3.3/3.4
|
|
HF26/30
|
385/395
|
3.85/3.95
|
260/270
|
3.27/3.39
|
300/310
|
3.77/3.89
|
26.0/27.0
|
3.3/3.4
|
|
HF28/26
|
385/395
|
3.85/3.95
|
250/265
|
3.14/3.33
|
260/275
|
3.27/3.45
|
28.0/30.0
|
3.5/3.8
|
|
HF28/28
|
385/395
|
3.85/3.95
|
260/270
|
3.27/3.39
|
280/290
|
3.50/3.60
|
28.0/30.0
|
3.5/3.8
|
|
HF30/26
|
395/405
|
3.95/4.05
|
250/260
|
3.14/3.33
|
260/270
|
3.27/3.39
|
30.0/31.5
|
3.8/3.9
|
|
HF32/17
|
410/420
|
4.10/4.20
|
160/180
|
2.01/2.26
|
165/175
|
2.07/2.20
|
32.0/33.0
|
4.0/4.1
|
|
HF32/22
|
410/420
|
4.10/4.20
|
215/225
|
2.70/2.83
|
220/230
|
2.76/2.89
|
32.0/33.0
|
4.0/4.1
|
|
HF32/25
|
410/420
|
4.10/4.20
|
240/250
|
3.01/3.14
|
250/260
|
3.14/3.27
|
32.0/33.0
|
4.0/4.1
|
Physical
Characteristics
|
Curie
Temperature |
°C |
450 |
|
Maximum
Working
Temperature |
°C |
250-280 |
|
Recoil
Permeability |
µrec |
1.05-1.30 |
|
Temperature
Coefficient
of Br |
%/°C |
-0.18 |
|
Temperature
Coefficient
of Hc |
%/°C |
0.2-0.5 |
|
Deflection
Strength |
Kgf/mm2 |
5-9 |
|
Compressive
Strength |
Kgf/mm2 |
>70 |
|
Tensile
Strength |
Kgf/mm2 |
2-5 |
|
Density |
g/cm3 |
4.7-5.1 |
|
Hardness |
HV |
480-580 |
|
Electric
Resistivity |
KOcm |
>104 |
The elements of
Ferrite magnet are
ferric oxide/barium,
strontium. Ferrite
has higher coercive
force and higher
resistance to be
demagnetized and
oxidized than other
non-rare earth
permanent magnets.
The biggest
advantage of such
magnet is their low
cost. It is widely
used from motors and
loudspeaders to toys
and craft etc.
Ferrite magnet is
Made by means of
powder metallurgy.
Its chemical
composition: Ba/Sro-Fe2O3.Hard
to be de-magnetized,
with good
anti-corrosion
property. The
products are make in
the shapes of
circular, cylinder,
square, tile-type.
Widely used for
magnetic
electro-machinery,
loudspeaker
products, micro
electro-machinery,
household appliance,
electronic acoustics
equipment, copycat,
magnetic motor
equipment, culture
and education tools
and magnetic
treatment equipment.
Hard Ferrite
(ceramic) magnets,
composed of barium
or strontium, were
developed in the
early 1960's as an
alternative to the
more expensive
metallic magnets.
This class of magnet
is very hard,
brittle and
possesses lower
energy
characteristics
compared to other
magnetic materials.
However, it is very
popular and widely
used because of its
excellent resistance
to demagnetizaion,
corrosion, and the
advantageous
pricing.
Ferrite magnets are
manufactured by
pressing, sintering,
or injection
molding. These
magnets can be both
anisotropic and
isotropic.
Anisotropic grades
are oriented in the
manufacturing
direction and must
be magnetized in the
direction of
orientation.
Isotropic grades are
not oriented and can
be magnetized in any
direction.
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