Hard Ferrite

Hard Ferrite

Hard Ferrite (ceramic) magnets, composed of barium or strontium, were developed in the early 1960's as an alternative to the more expensive metallic magnets. This class of magnet is very hard, brittle an...

Hard Ferrite (ceramic) magnets, composed of barium or strontium, were developed in the early 1960's as an alternative to the more expensive metallic magnets. This class of magnet is very hard, brittle and possesses lower energy characteristics compared to other magnetic materials. However, it is very popular and widely used because of its excellent resistance to demagnetizaion, corrosion, and the advantageous pricing. 

Ferrite magnets are manufactured by pressing, sintering, or injection molding. These magnets can be both anisotropic and isotropic. Anisotropic grades are oriented in the manufacturing direction and must be magnetized in the direction of orientation. Isotropic grades are not oriented and can be magnetized in any direction.

Applications of Ceramic Magnets

Speaker Magnets

DC brushless motors

Magnetic Resonance Imaging (MRI)

Magnetos used on lawnmowers and outboard motors

DC permanent magnet motors (used in cars)

Separators (separate ferrous material from non-ferrous)

Used in magnetic assemblies designed for lifting, holding, retrieving and separating

Mostly Used national standard - SJ285-77 permanent ferrite magnet standard

Grade

Br

Hcb

Hcj

BHmax

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

Y10T(=C1)

2.00/2.18

200/218

1.57/1.82

125/145

2.64/3.14

210/250

6.5/8.0

0.8/1.0

Y25

3.60/3.70

360/370

1.70/1.88

135/150

1.76/2.14

140/170

22.5/25.3

2.8/3.2

Y30(=C5)

3.80/3.85

380/385

2.40/2.64

191/210

2.50/2.51

199/220

26.0/28

3.4/3.7

Y30BH

3.80/3.90

380/390

2.80/2.95

223/235

2.90/3.08

231/245

27.0/30.0

3.4/3.7

Y33

4.10/4.20

410/420

2.77/2.95

220/235

2.83/3.01

225/240

31.5/33.0

4.0/4.2

Y35

4.00/4.10

400/410

2.20/2.45

175/195

2.26/2.51

180/200

30.0/32.0

3.8/4.0

C8(=C8A)

3.85/3.90

385/390

2.95/3.20

235/255

3.05/3.33

242/265

27.8/30.0

3.5/3.7

C10

4.00/4.10

400/410

3.62/3.77

288/300

3.51/3.60

280/287

30.4/31.9

3.8/4.0

USA standard - permanent ferrite magnet industry standard of USA

Grade

Br

Hcb

Hcj

BHmax

Density

Tw Max

Remark

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

g/cm3

C1

2.3

230

1.86

150

3.5

258

8.36

1.05

4.8

250

Isotropic

C5

3.8

380

2.4

190

2.5

200

27.1

3.4

4.9

250

C7

3.4

340

3.23

258

4.0

318

21.9

2.75

4.9

250

C8(C8A)

3.85

385

2.95

235

3.0

240

27.8

3.5

4.9

250

Anisotropic

C8B

4.2

420

2.9

232

2.96

236

32.8

4.1

4.9

250

C9

3.8

380

3.5

280

4.0

320

26.4

3.3

4.9

250

C10

4.0

400

3.6

288

3.5

280

30.4

3.8

4.9

250

C11

4.3

430

2.5

200

2.55

204

34.4

4.3

4.9

250

China standard -SJ/T10410 2000 permanent ferrite magnet standard

Grade

Br

Hcb

Hcj

BHmax

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

Y8T

2.0

200~235

1.57

125~160

2.61

210~280

6.5~9.5

0.8

Y22H

3.1

310~360

2.77

220~250

3.52

280~320

20.0~24.0

2.5

Y25

3.6

360~400

1.7

135~170

1.76

140~200

22.5~28.0

2.8

Y26H-1

3.6

360~390

2.51

220~250

2.83

225~255

23.0~28.0

2.9

Y26H-2

3.6

360-380

3.3

263-288

4.0

318-350

24.0-28.0

3.0

Y27H

3.5

370~400

2.83

225-240

2.95

235-260

25.0~29.0

3.1

Y28

3.7

370-400

2.2

175-210

2.26

180-220

26.0-30.0

3.3

Y28H-1

3.8

380-400

30.2

240-260

3.14

250-280

27.0-30.0

3.1

Y28H-2

3.6

360-380

3.4

271-295

4.8

382-405

26.0-30.0

3.3

Y30

3.7~4.0

370~400

2.20~2.64

175~210

2.26~2.77

180~220

26.0~30.0

3.3~3.8

Y30H-1

3.8

380~400

2.89

230-275

2.95

235-290

27.0~32.5

3.4

Y30H-2

3.95

395-415

3.46

275-300

3.9

310-335

27.0~32.0

3.4

Y32

4.0

400~420

2.01

160~190

2.07

165~195

30.0~33.5

3.8

Y32H-1

4.0

400-420

2.39

190-230

2.89

230-250

34.5-35.0

4.0

Y32H-2

4.0

400-440

2.81

224-240

2.89

230-250

31.0-34.0

3.9

Y33

4.1

410~430

2.76

220~250

2.83

225~255

31.5~35.0

4.0

Y33H

4.1

410-430

3.14

250-270

3.14

250-275

31.5-35.0

4.0

Y34

4.2

420-440

2.51

200-230

2.58

205-235

32.5-36.0

4.1

Y35

4.3

430-450

2.7

215-239

2.73

217-242

33.1-33.2

4.2

Japan TDK standard

Grade

Composition

Br

Hcb

Hcj

BHmax

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

FB40

SrO6

Fe2O3

4.1±10

410±10

2.95±0.15

234.8±

11.9

3.0±0.2

238.7±

15.9

31.4±1.6

3.95±0.2

FB3N

SrO6

Fe2O3

3.95±15

395±15

2.95±0.15

234.8±
11.9

3.0±0.2

238.7±

15.9

28.7±2.4

3.6±0.3

FB3G

SrO6Fe2O3

3.75±15

375±15

3.2±0.2

254.6±
15.9

3.4±0.25

270.6±

19.9

25.9±2.4

3.25±0.3

FB3X

SrO6Fe2O3

3.75±15

375±15

2.95±0.15

234.8±
11.9

3.0±0.2

238.7±

15.9

25.9±2.4

3.25±0.3

FB1A

SrO6Fe2O3

2.20±15

220±15

2.0±0.2

159.2±
15.9

3.25±0.25

258.6±

19.9

8.9±1.6

1.1±0.2

FB5H

SrO6Fe2O3

4.05±15

405±15

3.75±0.15

298.4±
11.9

4.05±0.15

322.3±

11.9

31.1±1.6

3.9±0.2

FB4X

SrO6Fe2O3

4.20±10

420±10

2.95±0.15

234.8±
11.9

3.0±0.2

238.7±

15.9

33.4±1.6

4.2±0.2

FB4B

SrO6Fe2O3

4.00±10

400±10

3.2±0.2

254.6±
11.9

3.3±0.25

262.6±

19.9

30.3±1.6

3.8±0.2

FB4A

SrO/

BaO6Fe2O3

4.10±10

410±10

2.2±0.2

175.1±
15.9

2.22±0.2

176.7±

15.9

31.8±1.6

4.0±0.2

FBGN

SrO6Fe2O3

4.40±10

440±10

3.25±0.15

258.6±
11.9

3.3±0.15

262.6±

11.9

36.7±1.6

4.6±0.2

FB6B

SrO6Fe2O3

4.20±10

420±10

3.8±0.15

302.4±
11.9

4.0±0.15

318.3±

11.9

33.4±1.6

4.2±0.2

FB6H

SrO6Fe2O3

4.00±10

400±10

3.8±0.15

302.4±
11.9

4.5±0.15

358.1±

11.9

30.3±1.6

3.8±0.2

FB6E

SrO6Fe2O3

3.80±10

380±10

3.65±0.15

290.5±
11.9

4.95±0.15

393.9±

11.9

27.5±1.6

3.45±0.2

FB5N

SrO6Fe2O3

4.40±10

440±10

2.85±0.15

256.8±
11.9

2.88±0.15

2259.2±

11.9

36.7±1.6

4.6±0.2

FB5B

SrO6Fe2O3

4.20±10

420±10

3.3±0.15

262.6±
11.9

3.35±0.15

266.6±

11.9

33.4±1.6

4.2±0.2

The standard from International Electronics Committee(IEC404-8-1)

Grade

Br

Hcb

Hcj

BHmax

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

HF8/22

2.00/2.20

200/220

1.57/1.76

125/140

2.76/2.89

220/230

6.5/6.8

0.8/1.1

HF20/19

3.20/3.33

320/333

2.14/2.39

170/190

2.39/2.51

190/200

20.0/21.0

2.5/2.7

HF20/28

3.10/3.25

310/325

2.76/2.89

220/230

3.52/3.64

280/290

20.0/21.0

2.5/2.7

HF22/30

3.50/3.65

350/365

3.20/3.33

255/265

3.64/3.77

290/300

22.0/23.5

2.8/3.0

HF24/16

3.50/3.65

350/365

1.95/2.20

155/175

2.01/2.26

160/180

24.0/25.5

3.0/3.2

HF24/23

3.50/3.65

350/365

2.76/2.89

220/230

2.89/3.01

230/240

24.0/25.5

3.0/3.2

HF24/35

3.60/3.70

360/370

3.27/3.39

260/270

4.40/4.52

350/360

24.0/25.5

3.0/3.2

HF26/16

3.70/3.80

370/380

1.95/2.20

155/175

2.01/2.26

160/180

26.0/27.0

3.2/3.4

HF26/18

3.70/3.80

370/380

2.20/2.39

175/190

2.26/2.39

180/190

26.0/27.0

3.3/3.4

HF26/24

3.70/3.80

370/380

2.89/3.01

230/240

3.01/3.14

240/250

26.0/27.0

3.3/3.4

HF26/26

3.70/3.80

370/380

2.89/3.01

230/240

3.27/3.39

260/270

26.0/27.0

3.3/3.4

HF26/30

3.85/3.95

385/395

3.27/3.39

260/270

3.77/3.89

300/310

26.0/27.0

3.3/3.4

HF28/26

3.85/3.95

385/395

3.14/3.33

250/265

3.27/3.45

260/275

28.0/30.0

3.5/3.8

HF28/28

3.85/3.95

385/395

3.27/3.39

260/270

3.50/3.60

280/290

28.0/30.0

3.5/3.8

HF30/26

3.95/4.05

395/405

3.14/3.33

250/260

3.27/3.39

260/270

30.0/31.5

3.8/3.9

Physical property of hard ferrite magnets

Typical Physical Properties

Curie Temperature (°C)

450

Maximum Operating Temperature (°C)

250

Hardness (Hv)

480-580

Density (g/cm3)

4.8 - 4.9

Relative Recoil Permeability (μrec)

1.05 - 1.20

Saturation Field Strength, kOe (kA/m)

10 (800)

Temperature Coefficient of Br (%/°C)

-0.2

Temperature Coefficient of iHc (%/°C)

0.3

Tensile Strength (N/mm)

<100

Transverse Rupture Strength (N/mm)

300

Tolerances

For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater. According to IMA standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of pole surface.

Machining

Since ceramic material is so brittle, it requires special machining techniques and equipment. We are fully equipped to cut and grind ceramic material to your specifications.

PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 17pt; mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid windowtext .5pt" width=58>288/300

USA standard - permanent ferrite magnet industry standard of USA

Grade

Br

Hcb

Hcj

BHmax

Density

Tw Max

Remark

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

g/cm3

C1

2.3

230

1.86

150

3.5

258

8.36

1.05

4.8

250

Isotropic

C5

3.8

380

2.4

190

2.5

200

27.1

3.4

4.9

250

C7

3.4

340

3.23

258

4.0

318

21.9

2.75

4.9

250

C8(C8A)

3.85

385

2.95

235

3.0

240

27.8

3.5

4.9

250

Anisotropic

C8B

4.2

420

2.9

232

2.96

236

32.8

4.1

4.9

250

C9

3.8

380

3.5

280

4.0

320

26.4

3.3

4.9

250

C10

4.0

400

3.6

288

3.5

280

30.4

3.8

4.9

250

C11

4.3

430

2.5

200

2.55

204

34.4

4.3

4.9

250

China standard -SJ/T10410 2000 permanent ferrite magnet standard

Grade

Br

Hcb

Hcj

BHmax

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

Y8T

2.0

200~235

1.57

125~160

2.61

210~280

6.5~9.5

0.8

Y22H

3.1

310~360

2.77

220~250

3.52

280~320

20.0~24.0

2.5

Y25

3.6

360~400

1.7

135~170

1.76

140~200

22.5~28.0

2.8

Y26H-1

3.6

360~390

2.51

220~250

2.83

225~255

23.0~28.0

2.9

Y26H-2

3.6

360-380

3.3

263-288

4.0

318-350

24.0-28.0

3.0

Y27H

3.5

370~400

2.83

225-240

2.95

235-260

25.0~29.0

3.1

Y28

3.7

370-400

2.2

175-210

2.26

180-220

26.0-30.0

3.3

Y28H-1

3.8

380-400

30.2

240-260

3.14

250-280

27.0-30.0

3.1

Y28H-2

3.6

360-380

3.4

271-295

4.8

382-405

26.0-30.0

3.3

Y30

3.7~4.0

370~400

2.20~2.64

175~210

2.26~2.77

180~220

26.0~30.0

3.3~3.8

Y30H-1

3.8

380~400

2.89

230-275

2.95

235-290

27.0~32.5

3.4

Y30H-2

3.95

395-415

3.46

275-300

3.9

310-335

27.0~32.0

3.4

Y32

4.0

400~420

2.01

160~190

2.07

165~195

30.0~33.5

3.8

Y32H-1

4.0

400-420

2.39

190-230

2.89

230-250

34.5-35.0

4.0

Y32H-2

4.0

400-440

2.81

224-240

2.89

230-250

31.0-34.0

3.9

Y33

4.1

410~430

2.76

220~250

2.83

225~255

31.5~35.0

4.0

Y33H

4.1

410-430

3.14

250-270

3.14

250-275

31.5-35.0

4.0

Y34

4.2

420-440

2.51

200-230

2.58

205-235

32.5-36.0

4.1

Y35

4.3

430-450

2.7

215-239

2.73

217-242

33.1-33.2

4.2

Japan TDK standard

Grade

Composition

Br

Hcb

Hcj

BHmax

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

FB40

SrO6Fe2O3

4.1±10

410±10

2.95±0.15

234.8±
11.9

3.0±0.2

238.7±
15.9

31.4±1.6

3.95±0.2

FB3N

SrO6Fe2O3

3.95±15

395±15

2.95±0.15

234.8±
11.9

3.0±0.2

238.7±
15.9

28.7±2.4

3.6±0.3

FB3G

SrO6Fe2O3

3.75±15

375±15

3.2±0.2

254.6±
15.9

3.4±0.25

270.6±
19.9

25.9±2.4

3.25±0.3

FB3X

SrO6Fe2O3

3.75±15

375±15

2.95±0.15

234.8±
11.9

3.0±0.2

238.7±
15.9

25.9±2.4

3.25±0.3

FB1A

SrO6Fe2O3

2.20±15

220±15

2.0±0.2

159.2±
15.9

3.25±0.25

258.6±
19.9

8.9±1.6

1.1±0.2

FB5H

SrO6Fe2O3

4.05±15

405±15

3.75±0.15

298.4±
11.9

4.05±0.15

322.3±
11.9

31.1±1.6

3.9±0.2

FB4X

SrO6Fe2O3

4.20±10

420±10

2.95±0.15

234.8±
11.9

3.0±0.2

238.7±
15.9

33.4±1.6

4.2±0.2

FB4B

SrO6Fe2O3

4.00±10

400±10

3.2±0.2

254.6±
11.9

3.3±0.25

262.6±
19.9

30.3±1.6

3.8±0.2

FB4A

SrO/

BaO6Fe2O3

4.10±10

410±10

2.2±0.2

175.1±
15.9

2.22±0.2

176.7±
15.9

31.8±1.6

4.0±0.2

FBGN

SrO6Fe2O3

4.40±10

440±10

3.25±0.15

258.6±
11.9

3.3±0.15

262.6±
11.9

36.7±1.6

4.6±0.2

FB6B

SrO6Fe2O3

4.20±10

420±10

3.8±0.15

302.4±
11.9

4.0±0.15

318.3±
11.9

33.4±1.6

4.2±0.2

FB6H

SrO6Fe2O3

4.00±10

400±10

3.8±0.15

302.4±
11.9

4.5±0.15

358.1±
11.9

30.3±1.6

3.8±0.2

FB6E

SrO6Fe2O3

3.80±10

380±10

3.65±0.15

290.5±
11.9

4.95±0.15

393.9±
11.9

27.5±1.6

3.45±0.2

FB5N

SrO6Fe2O3

4.40±10

440±10

2.85±0.15

256.8±
11.9

2.88±0.15

2259.2±
11.9

36.7±1.6

4.6±0.2

FB5B

SrO6Fe2O3

4.20±10

420±10

3.3±0.15

262.6±
11.9

3.35±0.15

266.6±
11.9

33.4±1.6

4.2±0.2

The standard from International Electronics Committee(IEC404-8-1)

Grade

Br

Hcb

Hcj

BHmax

kGs

mT

kOe

kA/m

kOe

kA/m

KJ/m3

MGOe

HF8/22

2.00/2.20

200/220

1.57/1.76

125/140

2.76/2.89

220/230

6.5/6.8

0.8/1.1

HF20/19

3.20/3.33

320/333

2.14/2.39

170/190

2.39/2.51

190/200

20.0/21.0

2.5/2.7

HF20/28

3.10/3.25

310/325

2.76/2.89

220/230

3.52/3.64

280/290

20.0/21.0

2.5/2.7

HF22/30

3.50/3.65

350/365

3.20/3.33

255/265

3.64/3.77

290/300

22.0/23.5

2.8/3.0

HF24/16

3.50/3.65

350/365

1.95/2.20

155/175

2.01/2.26

160/180

24.0/25.5

3.0/3.2

HF24/23

3.50/3.65

350/365

2.76/2.89

220/230

2.89/3.01

230/240

24.0/25.5

3.0/3.2

HF24/35

3.60/3.70

360/370

3.27/3.39

260/270

4.40/4.52

350/360

24.0/25.5

3.0/3.2

HF26/16

3.70/3.80

370/380

1.95/2.20

155/175

2.01/2.26

160/180

26.0/27.0

3.2/3.4

HF26/18

3.70/3.80

370/380

2.20/2.39

175/190

2.26/2.39

180/190

26.0/27.0

3.3/3.4

HF26/24

3.70/3.80

370/380

2.89/3.01

230/240

3.01/3.14

240/250

26.0/27.0

3.3/3.4

HF26/26

3.70/3.80

370/380

2.89/3.01

230/240

3.27/3.39

260/270

26.0/27.0

3.3/3.4

HF26/30

3.85/3.95

385/395

3.27/3.39

260/270

3.77/3.89

300/310

26.0/27.0

3.3/3.4

HF28/26

3.85/3.95

385/395

3.14/3.33

250/265

3.27/3.45

260/275

28.0/30.0

3.5/3.8

HF28/28

3.85/3.95

385/395

3.27/3.39

260/270

3.50/3.60

280/290

28.0/30.0

3.5/3.8

HF30/26

3.95/4.05

395/405

3.14/3.33

250/260

3.27/3.39

260/270

30.0/31.5

3.8/3.9

Physical property of hard ferrite magnets

Typical Physical Properties

Curie Temperature (°C)

450

Maximum Operating Temperature (°C)

250

Hardness (Hv)

480-580

Density (g/cm3)

4.8 - 4.9

Relative Recoil Permeability (μrec)

1.05 - 1.20

Saturation Field Strength, kOe (kA/m)

10 (800)

Temperature Coefficient of Br (%/°C)

-0.2

Temperature Coefficient of iHc (%/°C)

0.3

Tensile Strength (N/mm)

<100

Transverse Rupture Strength (N/mm)

300

Tolerances

For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005. Other dimensions are ± 2.5% or ± .010, whichever is greater. According to IMA standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more than 50% of pole surface.

Machining

Since ceramic material is so brittle, it requires special machining techniques and equipment. We are fully equipped to cut and grind ceramic material to your specifications.

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