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Ceramic Magnets (Hard Ferrite) are composed of barium or strontium, which 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 demagnetisation, corrosion, and the advantageous pricing.  Ferrite magnets are manufactured by pressing, sintering, or injection moulding.  These magnets can be both anisotropic and isotropic. Anisotropic grades are oriented during the manufacturing process and must be magnetised in the direction of orientation. Isotropic grades are not oriented and can be magnetised 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 for lifting, holding, retrieving and separating

 

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


 
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