Magnet raw material
Presintered Ferrite Powder
Bonded Ferrite Powder
Dry Pressing Ferrite powder
Wet pressing ferrite powder
MnZn Ferrite powder
Alnico powder
Neodymium(NdFeB) powder
Magnet assembly
Flexible magnet
Magnets
Sinterde Neodymium(NdFeB)
Bonded Neodymium(NdFeB)
Sintered Ferrite
Bonded ferrite
Sintered Alnico
Cast Alnico
Samarium Cobalt
Bonded Alnico
Magnet Coating
Magnet shapes
Sintered Ferrite  
Sintered Ferrite Magnets £®Ceramic Magnets£©are mainly two types of ferrite magnets, barium ferrite (BaO.6Fe2O3) and strontium ferrite (SrO.6Fe2O3). They offer have high Intrinsic Coercive Force (Hci) and have good corrosion resistance and generally do not require a coating or plating. They are hard and brittle. Due to the low cost and good performance, make the sintered ferrite magnets a popular choice for electromechanical applications (such as motor, speaker).

Manufacture process:

Pressing and sintering involves pressing very fine ferrite powder in a die, and then sintering this pressed magnet. All fully dense Ferrite magnets are produced this way. Ferrite magnets can be wet pressed or dry pressed. Wet pressing yields better magnetic properties, but poorer physical tolerances. Generally, the powder is dry for grade 1 or 5 materials, and wet for grade 8 and higher materials. Sintering involves subjecting the material to high temperatures to fuse the pressed powder together, thus creating a solid material. Magnets produced through this process usually need to have some finish machining, otherwise surface finishes and tolerances are not acceptable. Some manufacturers extrude instead of press wet powder slurry and then sinter the material. This is sometimes done for arc segment shapes, where the arc cross-section is extruded in long lengths, sintered, and then cut to length.

 

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/m 3

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/T 10410 2000 Permanent Ferrite magnet standard

Grade (Br) (HcB) (HcJ) (BH)max
mT KGauss KA/m KOe KA/m KOe KJ/m3 MGOe
Y8T 200~235 2.0~2.35 125-160 1.57-2.01 210-280 2.64-3.51 6.5-9.5 0.8-1.2
Y22H 310~360 3.10~3.60 220-250 2.76-3.14 280-320 3.51-4.02 20.0-24.0 2.5-3.0
Y25 360~400 3.60~4.00 135-170 1.70-2.14 140-200 1.76-2.51 22.5-28.0 2.8-3.5
Y26H-1 360~390 3.60~3.90 200-250 2.51-3.14 225-255 2.83-3.20 23.0-28.0 2.9-3.5
Y26H-2 360~380 3.60~3.80 263-288 3.30-3.62 318-350 3.99-4.40 24.0-28.0 3.0-3.5
Y27H 350~380 3.50~3.80 225-240 2.83-3.01 235-260 2.95-3.27 25.0-29.0 3.1-3.6
Y28 370~400 3.70~4.00 175-210 2.20-3.64 180-220 2.26-2.76 26.0-30.0 3.3-3.8
Y28H-1 380~400 3.80~4.00 240-260 3.01-3.27 250-280 3.14-3.52 27.0-30.0 3.4-3.8
Y28H-2 360~380 3.60~3.80 271-295 3.40-3.70 382-405 4.80-5.08 26.0-30.0 3.3-3.8
Y30H-1 380~400 3.80~4.00 230-275 2.89-3.46 235-290 2.95-3.64 27.0-32.5 3.4-4.1
Y30H-2 395~415 3.95~4.15 275-300 3.45-3.77 310-335 3.89-4.20 27.0-32.0 3.4-4.0
Y32 400~420 4.00~4.20 160-190 2.01-2.39 165-195 2.07-2.45 30.0-33.5 3.8-4.2
Y32H-1 400~420 4.00~4.20 190-230 2.39-2.89 230-250 2.89-3.14 31.5-35.0 3.9-4.4
Y32H-2 400~440 4.00~4.40 224-240 2.81-3.01 230-250 2.89-3.14 31.0-34.0 3.9-4.3
Y33 410~430 4.10~4.30 220-250 2.76-3.14 225-255 2.83-3.20 31.5-35.0 3.9-4.4
Y33H 410~430 4.10~4.30 250-270 3.14-3.39 250-275 3.14-3.45 31.5-35.0 3.9-4.4
Y34 420~440 4.20~4.40 200-230 2.51-2.89 205-235 2.57-2.95 32.5-36.0 4.1-4.4
Y35 430~450 4.30~4.50 215-239 2.70-3.00 217-241 2.73-3.03 33.1-38.2 4.1-4.8
Y36 430~450 4.30~4.50 247-271 3.10-3.40 250-274 3.14-3.44 35.1-38.3 4.4-4.8
Y38 440~460 4.40~4.60 285-305 3.58-3.83 294-310 3.69-3.89 36.6-40.6 4.6-5.1
Y40 440~460 4.40~4.60 330-354 4.15-4.45 340-360 4.27-4.52 37.6-41.8 4.7-5.2

Physical property of hard ferrite mangets

Parameters

Mark

Unit

Value

Recoil Permeability

Urce

-

1.05-1.3

Curie temperture

Tc

0 C

460

The temperature of Br

¶ŃBr

0 C -1

-0.2%

The temperature of Hcj

¶ŃHcj

0 C -1

0.2-0.5%

Density

D

g/cm 3

4.5-5.1

Resistivity

P

¶ł.cm

°›10000

Hardness

HV

-

480-580

 

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