|
Ferrite(Ceramic)
Magnet is manufactured from oxide materials using powder metallurgical process.
Ceramic magnet is most widely used because of its low cost, high-energy,
good electric insulation and excellent resistance to demagnetization. The
most common type of ceramic magnets are anisotropic strontium, anisotropic
barium and isotropic barium magnet.
There are two manufacturing
process for ferrite magnets:
Dry Process & Wet Process.By dry process, can produce isotropic &
anisotropic magnets; by wet process, only anisotropic magnets can be produced.Isotropic
ferrite magnets are not oriented and can be magnetized in any direction;
anisotropic ferrite magnets are different, they are all oriented in the
manufacturing direction, and should be magnetized in the direction of
orientation. For dry process, the tool can be changed and developed easily,
while for wet process, it is complicated to change the tool and the tooling
charge is much higher. At present, we have put our emphasis on arc segment
magnets for electric motors, disc magnets and block magnets for special
applications .
| Grade
|
Value(min/typical
in our factory) |
| Br
|
Hcb(BHC)
|
Hcj(IHC)
|
(BH)max
|
| MT
|
KG
|
KA/m
|
Koe
|
KA/m
|
KOe
|
Kj/m3
|
MGOe
|
| Y10T(=C1)
|
200/218
|
2.00/2.18
|
125/145
|
1.57/1.82
|
210/250
|
2.64/3.14
|
6.5/8.0
|
0.8/1.0
|
| Y25
|
360/370
|
3.60/3.70
|
135/150
|
1.70/1.88
|
140/170
|
1.76/2.14
|
22.5/25.3
|
2.8/3.2
|
| Y30(=C5)
|
380/385
|
3.80/3.85
|
191/210
|
2.40/2.64
|
199/220
|
2.50/2.51
|
26.0/28
|
3.4/3.7
|
| Y30BH
|
380/390
|
3.80/3.90
|
223/235
|
2.80/2.95
|
231/245
|
2.90/3.08
|
27.0/30.0
|
3.4/3.7
|
| Y33
|
410/420
|
4.10/4.20
|
220/235
|
2.77/2.95
|
225/240
|
2.83/3.01
|
31.5/33.0
|
4.0/4.2
|
| Y35
|
400/410
|
4.00/4.10
|
175/195
|
2.20/2.45
|
180/200
|
2.26/2.51
|
30.0/32.0
|
3.8/4.0
|
| C8(=C8A)
|
385/390
|
3.85/3.90
|
235/255
|
2.95/3.20
|
242/265
|
3.05/3.33
|
27.8/30.0
|
3.5/3.7
|
| C10
|
400/410
|
4.00/4.10
|
288/300
|
3.62/3.77
|
280/287
|
3.51/3.60
|
30.4/31.9
|
3.8/4.0
|
USA
standard - permanent ferrite magnet industry standard of USA
| 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
|
Japan TDK standard
| Grade
|
Composition |
Br
|
Hcb
|
Hcj
|
BH
max |
| ¡¡
|
¡¡
¡¡ |
mT
|
kG
|
kA/m
|
kOe
|
kA/m
|
kOe
|
KJ/m3
|
MGOe
|
| FB40
|
SrO6Fe2O3
|
410+/-10
|
4.1+/-10
|
234.8+/-11.9
|
2.95+/-0.15
|
238.7+/-15.9
|
3.0+/-0.2
|
31.4+/-1.6
|
3.95+/-0.2
|
| FB3N
|
SrO6Fe2O3
|
395+/-15
|
3.95+/-15
|
234.8+/-11.9
|
2.95+/-0.15
|
238.7+/-15.9
|
3.0+/-0.2
|
28.7+/-2.4
|
3.6+/-0.3
|
| FB3G
|
SrO6Fe2O3
|
375+/-15
|
3.75+/-15
|
254.6+/-15.9
|
3.2+/-0.2
|
270.6+/-19.9
|
3.4+/-0.25
|
25.9+/-2.4
|
3.25+/-0.3
|
| FB3X
|
SrO6Fe2O3
|
375+/-15
|
3.75+/-15
|
234.8+/-11.9
|
2.95+/-0.15
|
238.7+/-15.9
|
3.0+/-0.2
|
25.9+/-2.4
|
3.25+/-0.3
|
| FB1A
|
SrO6Fe2O3
|
220+/-15
|
2.20+/-15
|
159.2+/-15.9
|
2.0+/-0.2
|
258.6+/-19.9
|
3.25+/-0.25
|
8.9+/-1.6
|
1.1+/-0.2
|
| FB5H
|
SrO6Fe2O3
|
405+/-15
|
4.05+/-15
|
298.4+/-11.9
|
3.75+/-0.15
|
322.3+/-11.9
|
4.05+/-0.15
|
31.1+/-1.6
|
3.9+/-0.2
|
| FB4X
|
SrO6Fe2O3
|
420+/-10
|
4.20+/-10
|
234.8+/-11.9
|
2.95+/-0.15
|
238.7+/-15.9
|
3.0+/-0.2
|
33.4+/-1.6
|
4.2+/-0.2
|
| FB4B
|
SrO6Fe2O3
|
400+/-10
|
4.00+/-10
|
254.6+/-11.9
|
3.2+/-0.2
|
262.6+/-19.9
|
3.3+/-0.25
|
30.3+/-1.6
|
3.8+/-0.2
|
| FB4A
|
SrO/BaO6Fe2O3
|
410+/-10
|
4.10+/-10
|
175.1+/-15.9
|
2.2+/-0.2
|
176.7+/-15.9
|
2.22+/-0.2
|
31.8+/-1.6
|
4.0+/-0.2
|
| FBGN
|
SrO6Fe2O3
|
440+/-10
|
4.40+/-10
|
258.6+/-11.9
|
3.25+/-0.15
|
262.6+/-11.9
|
3.3+/-0.15
|
36.7+/-1.6
|
4.6+/-0.2
|
| FB6B
|
SrO6Fe2O3
|
420+/-10
|
4.20+/-10
|
302.4+/-11.9
|
3.8+/-0.15
|
318.3+/-11.9
|
4.0+/-0.15
|
33.4+/-1.6
|
4.2+/-0.2
|
| FB6H
|
SrO6Fe2O3
|
400+/-10
|
4.00+/-10
|
302.4+/-11.9
|
3.8+/-0.15
|
358.1+/-11.9
|
4.5+/-0.15
|
30.3+/-1.6
|
3.8+/-0.2
|
| FB6E
|
SrO6Fe2O3
|
380+/-10
|
3.80+/-10
|
290.5+/-11.9
|
3.65+/-0.15
|
393.9+/-11.9
|
4.95+/-0.15
|
27.5+/-1.6
|
3.45+/-0.2
|
| FB5N
|
SrO6Fe2O3
|
440+/-10
|
4.40+/-10
|
256.8+/-11.9
|
2.85+/-0.15
|
2259.2+/-11.9
|
2.88+/-0.15
|
36.7+/-1.6
|
4.6+/-0.2
|
| FB5B
|
SrO6Fe2O3
|
420+/-10
|
4.20+/-10
|
262.6+/-11.9
|
3.3+/-0.15
|
266.6+/-11.9
|
3.35+/-0.15
|
33.4+/-1.6
|
4.2+/-0.2
|
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 property of hard ferrite magnets
| Typical
Physical Properties |
| Curie
Temperature (¡ãC) |
450 |
| Maximum Operating
Temperature (¡ãC) |
250 |
| Hardness (Hv) |
480-580 |
| Density (g/cm3) |
4.8 - 4.9 |
| Relative Recoil Permeability
(¦Ìrec) |
1.05 - 1.20 |
| Saturation Field Strength,
kOe (kA/m) |
10 (800) |
| Temperature Coefficient
of Br (%/¡ãC) |
-0.2 |
| Temperature Coefficient
of iHc (%/¡ãC) |
0.3 |
| Tensile Strength (N/mm) |
<100 |
| Transverse Rupture
Strength (N/mm) |
300 |
|
