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Barium Strontium Ferrite Magnet And Speaker Ceramic Magnets For Sale

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    2017-07-11 07:40

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Xiamen Jingxin Imp. & Exp. Co.,Ltd
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Barium Strontium Ferrite Magnet And Speaker Ceramic Magnets For Sale

Ferrite magnet is also called ceramic magnets. The main components of the raw materials are iron oxide, 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

μrec

μrec

1.05~1.3


Curie temperature

Tc

°C

460


The coefficient of Br to temperature

αBr

°C-1

-0.20%

0~100°C

The coefficient of Hcj to temperature

αHCJ

°C-1

0.2%~0.5%

0~100°C

Density

D

g/cm3

4.8~5.0


The coefficient of linear expansion

αR

°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