Ferrite Magnet
Ferrite Magnet
Ferrite magnet is also called ceramic magnets. The main components of the raw materials are iron oxide,Website:, barium carbonate or strontium carbonate. So it have two types, one is Barium ferrite magnet, and the other is Strontium ferrite magnet.
The ferrite magnets have higher coercive fore, higher resistance to be demagnetized and higher corrosion resistance than other non-rare earth permanent magnets , belonging to the semiconductor type, the eddy current loss, coercive force, can be effectively applied to the air gap in the magnetic circuit, especially suitable for small permanent magnet generator and motor. It does not contain precious metals nickel, cobalt, rich sources of raw materials, process is not complicated, low cost, can replace the AlNiCo magnet. The maximum energy product (BH) max is relatively low, so in the case of equal energy, than the metal magnet size. Its temperature stability is poor, crisp texture, fragile, not resistant to shock and vibration, is not suitable for measuring instruments and precision requirements of the magnetic device.
The main products of permanent magnet ferrite are anisotropic series. They can be used for making permanent magnet ignition motor, permanent magnet motor, permanent magnetic concentrator, permanent magnet crane head thrust magnetic bearing, magnetic separator, a loudspeaker, a microwave devices, magnetic films, hearing aids and so on.
Physical property of hard ferrite magnet
Parameters
Mark
Unit
Value
Note
Relative Recoil Permeability
rec
rec
1.05~1.3
Curie temperature
Tc
C
460
The coefficient of Br to temperature
Br
C-1
-0.20%
0~100 C
The coefficient of Hcj to temperature
HCJ
C-1
0.2%~0.5%
0~100 C
Density
D
g/cm3
4.8~5.0
The coefficient of linear expansion
R
C-1
7~15 10-6
Hardness
HV
HV
480~580
Ceramic magnets industry standard of USA
Grade
Br
(mT)
Hcb
(KA/m)
Hcj
(KA/m)
(BH)max
(KJ/m3)
D
(g/cm3)
C1
230
148
258
8.36
4.8
C5
380
191
199
27
4.8
C7
370 10
270 8
318 8
26.1 0.8
4.8
C8A
390 10
231 8
235 8
28.7 0.8
4.8
C8B
410 10
231 8
235 8
32.6 0.8
4.9
C9
380 10
279 8
318 8
26.2 0.8
4.8
C10
400 10
267 8
279 8
30.3 0.8
4.9
C11
420 10
223 8
227 8
34.2 0.8
4.9
C12
400 10
290 8
318 8
32.0 0.8
4.9
SJ/T10410-2000 permanent magnet ferrite standard
Grade
Br
Hcb
Hcj
(BH)max
mT
Gs
KA/m
Oe
KA/m
Oe
KJ/m3
MGOe
Y8T
200~235
2000
125~160
1570
210~280
2610
6.5~9.5
0.8
Y22H
310~360
3100
220~250
2770
280~320
3520
20.0~24.0
2.5
Y25
360~400
3600
135~170
1700
140~200
1760
22.5~28.0
2.8
Y26H-1
360~390
3600
200~250
2512
225~255
2830
23.0~28.0
2.9
Y26H-2
360~380
3600
263~288
3300
318~350
4000
24.0~28.0
3.0
Y27H
350~380
3500
225~240
2830
235~260
2950
25.0~29.0
3.1
Y28
370~400
3700
175~210
2200
180~220
2260
26.0~30.0
3.3
Y28H-1
380~400
3800
240~260
3020
250~280
3140
27.0~30.0
3.4
Y28H-2
360~380
3600
271~295
3400
382~405
4800
26.0~30.0
3.3
Y30H-1
380~400
3800
230~275
2890
235~290
2950
27.0~32.5
3.4
Y30H-2
395~415
3950
275~300
3460
310~335
3900
27.0~32.0
3.4
Y32
400~420
4000
160~190
2010
165~195
2070
30.0~33.5
3.8
Y32H-1
400~420
4000
190~230
2390
230~250
2890
31.0~35.0
3.9
Y32H-2
400~440
4000
224~240
2810
230~250
2890
31.0~34.0
3.9
Y33
410~430
4100
220~250
2760
225~255
2830
31.5~35.0
4.0
Y33H
410~430
4100
250~270
3140
250~275
3140
31.5~35.0
4.0
Y34
420~440
4200
200~230
2510
205~235
2580
32.5~36.0
4.1
Y35
430~450
4300
215~239
2700
217~241
2730
33.1~33.2
4.2
Y36
440~450
4400
247~271
3100
250~374
3140
35.1~38.3
4.4
Y38
440~460
4400
285~305
3580
294~310
3690
36.6~40.6
4.6
Y40
450~460
4500
330~354
4150
340~360
4270
37.6~41.8
4.7
SJ285-77 permanent ferrite magnets standard
Grade
Br
Hcb
(BH)max
T
Gs
KA/m
Oe
KJ/m3
MGOe
Y10T
0.20
2000
128~160
1600~2000
6.4~9.6
0.8~1.2
Y15
0.28~0.36
2800~3600
128~192
1600~2400
14.3~17.5
1.8~2.2
Y20
0.32~0.38
3200~3800
128~192
1600~2400
18.3~21.5
2.3~2.7
Y25
0.35~0.39
3500~3900
152~208
1900~2600
22.3~25.5
2.8~3.2
Y30
0.38~0.42
3800~4200
160~216
2000~2700
26.3~29.5
3.3~3.7
Y35
0.40~0.44
4000~4400
176~224
2200~2800
30.3~33.4
3.8~4.2
Y15H
0.31
3100
232~248
2900~3100
17.5
2.2
Y20H
0.34
3400
248~264
3100~3300
21.5
2.7
Y25BH
0.36~0.39
3600~3900
176~216
2200~2700
23.9~27.1
3.0~3.4
Y30BH
0.38~0.40
3800~4000
224~240
2800~3000
27.1~30.3
3.4~3.8
German Standard (DIN 17410)
Grade
Br
Hcb
Hcj
(BH)max
mT
kA/m
kA/m
kJ/m3
MGOe
HF 8/22
Isotropic
min
210
135
220
8
1
typ
220
145
250
9
1.1
HF 24/23
Anisotropic
min
360
220
230
24
3
typ
370
230
260
25.5
3.2
HF 28/16
Anisotropic
min
390
160
160
28
3.5
typ
400
170
170
30
3.8
HF 28/26
Anisotropic
min
380
250
260
28
3.4
typ
390
265
280
29.5
3.6
HF 28/34
Anisotropic
min
380
280
340
29
3.6
typ
390
290
360
31.5
4
HF 30/16
Anisotropic
min
400
160
160
30
3.8
typ
410
170
170
31.5
3.9
HF 30/31
Anisotropic
min
400
280
310
30
3.8
typ
405
285
320
31.5
4
HF 34/21
Anisotropic
min
430
210
210
34
4.3
typ
440
215
220
35
4.4
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