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Sintered Ferrite Magnets

 
General Introduction

Sintered Ferrite magnet (Ceramic Magnets, Hard Ferrite Magnet) were developed in the 1960's as a low cost alternative to metallic magnets. Even though they exhibit low energy (compared with other permanent magnet materials) and are relatively brittle and hard, Sintered Ferrite magnet (ceramic magnets, Hard ferrite magnet) have won wide acceptance due to their good resistance to demagnetization, excellent corrosion resistance and low price per pound. In fact, measured by weight, ferrite represents more than 75 percent of the world magnet consumption. Sintered Ferrite Magnet (Hard Ferrite Magnet) is the first choice for most types of DC motors, magnetic separators, magnetic resonance imaging and automotive sensors.

The elements of Sintered NdFeB Magnet (Hard 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 loudspeakers to toys and craft, industrial holding magnet etc.

Besides industrial application, Sintered Ferrite magnet (Ceramic Magnets, Hard Ferrite Magnet) are widely use in Educational area.

What shapes can it be formed?   ceramic magnet, sintered ferrite magnet
sintered ferrite magnet, hard ferrite magnet sintered ferrite magnet, hard ferrite magnet
sintered ferrite magnet, hard ferrite magnet sintered ferrite magnet, hard ferrite magnet
sintered ferrite magnet, hard ferrite magnet sintered ferrite magnet, hard ferrite magnet

Magnetic Properties of Sintered Ferrite Magnets

National standard

Grade
Value
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

Chinese standard

Material
Br
HcB
HcJ
(BH)max
mT
KG
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
220~250
≥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
370~400
≥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
≥3.1
Y28H-2
360-380
≥3600
271-295
≥3400
382-405
≥1800
26.0-30.0
≥3.3
Y30
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
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
34.5-35.0
≥4.0
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
217-242
≥2730
33.1-33.2
≥4.2
Y36
440-450
≥4400
247-271
≥3100
250-374
≥4400
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

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

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

Physical Characteristics

Compressive Strength
1.4 x 104 kg/cm2
Required Magnetizing Field
12,000 - 15,000 Oe
Electrical Resistivity
> 104 μ-ohm-cm/cm2
Density
4.7-5.0 g/cm3
Recoil Permeability
1.05 μr
Rev. Temp. Coeff.
-0.20 %/°C