General introduction of sintered ferrite magnets (hard ferrites)

Sintered ferrite magnets (ceramic magnets, hard ferrite magnets) 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, ferrite magnets 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 magnets (hard ferrites) are the first choice for most types of DC motors, magnetic separators, magnetic resonance imaging and automotive sensors.

The elements of hard ferrite magnets are ferric oxide/ barium, strontium. Ferrites 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 magnets (ceramic magnets, hard ferrites) are widely used in educational area.

We know the professional manufacturers and suppliers of ferrite magnets in China.


What shapes can be formed with ferrite magnets?

example Ferrite Magnets   example Ferrite Magnets
 
example Ferrite Magnets   example Ferrite Magnets
 
example Ferrite Magnets   example Ferrite Magnets

 

Magnetic properties of sintered ferrite magnets (ceramic magnets, hard ferrite magnets):

Chinese standard

Material

Br

Hcb

Hcj

(BH)max

mT

KG s

KA/m

KOe

KA/m

KOe

KJ/m 3

MGOe

Y10T

200~235

2.0~2.35

125~160

1.57~2.01

210~280

2.64~3.52

6.5~9.5

0.8~1.2

Y20

320~380

3.2~3.8

135~190

1.70~2.38

140~195

1.76~2.45

18.0~22.0

2.3~2.8

Y22H

310~360

3.1~3.6

220~250

2.77~3.14

280~320

3.52~4.02

20.0~24.0

2.5~3.0

Y23

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

360~380

3.6~4.0

135~170

1.70~2.14

140~200

1.76~2.51

22.5~28.0

2.8~3.5

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

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

Y30BH

380~390

3.8~3.90

223~235

2.80~2.95

231~245

2.90~3.08

27.0~30.0

3.4~3.7

Y30-1

380~400

3.8~4.0

230~275

2.89~3.46

235~290

2.95~3.65

27.0~32.0

3.4~4.0

Y30H-2

395~415

3.95~4.15

275~300

3.46~3.77

310~335

3.90~4.21

28.5~32.5

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

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

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


USA standard

Material

Br

Hcb

Hcj

(BH)max

mT

KGs

KA/m

KOe

KA/m

KOe

KJ/m 3

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)
O×100=Y10T=C1   ×300=Y30=C5   O×330=Y30 BH

Grade

Allowed Value (min-typical)

Br

Hcb

BrHcj

(BH)max

mT

KGs

KA/m

KOe

KA/m

KOe

KJ/m 3

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