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Block Shape Disc Shape Ring-Shape
Segment (Arc) Cut Type Peculiar shape magnet 
Isotropic Ferrite Magnet    

HARD FERRITE (Ceramic)PERMANENT MAGNETS


 

 

Ferrite(Ceramic) Magnet is manufactured from oxide materials using powder metallurgical process. Ceramic magnet is most widely used because of its low cost, high-energy, good electric insulation and excellent resistance to demagnetization. The most common type of ceramic magnets are anisotropic strontium, anisotropic barium and isotropic barium magnet.

Ferrite (Ceramic) Magnets are essentially composed of oxide materials with Barium Carbonate or Strontium Carbonate, manufactured under a powder metallurgical process. The feature of low recoil permeability, along with the high coercive force, makes them highly resistant to demagnetizing fields. In addition, their relatively low specific density and economical cost are also very attractive to the magnet designers. When designing the ferrite magnets for a particular application, primary consideration should be given to its shape limitation due to the powder metallurgical manufacturing process and the temperature dependence of ferrite materials. Ferrite Magnets has good anti-corrosion performance, no surface treatment needed. There are two manufacturing process for ferrite magnets:

Dry Process & Wet Process.By dry process, can produce isotropic & anisotropic magnets; by wet process, only anisotropic magnets can be produced.Isotropic ferrite magnets are not oriented and can be magnetized in any direction; anisotropic ferrite magnets are different, they are all oriented in the manufacturing direction, and should be magnetized in the direction of orientation. For dry process, the tool can be changed and developed easily, while for wet process, it is complicated to change the tool and the tooling charge is much higher. At present, we have put our emphasis on arc segment magnets for electric motors, disc magnets and block magnets for special applications .

Main products includes :hard ferrite arc or segment,ring magnets,rectangular magnets,ferrite power etc.Which have the following advatages:high coercive force,high electric resistance,long-time stability,and economical price.Meanwhile,we can manufacture new tools according to the customers`demand.

Production equipment

Conversion: 1.0KGs=100mT, 1.0KOe=79.6KA/m, 1.0MGOe=7.96KJ/m3.


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

Grade

Value(min/typical in our factory)

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 -sj/T10410 2000 permanent ferrite magnet 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

4800

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


USA standard - permanent ferrite magnet industry standard of USA

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


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


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


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 (rec)

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



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