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      1. Sintered Ferrite Magnets
        Category: Magnets  Publish Time: 2013-08-19 17:20 

        Sintered Ferrite Magnets
        Ferrite or Ceramic magnets are manufactured from a composite powder containing Iron oxide and Barium or Strontium oxide.

         Sintered Ferrite Magnets

         

        Ferrite or Ceramic magnets are manufactured from a composite powder containing Iron oxide and Barium or Strontium oxide. It 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.

        Ferrites suit a wide range of applications due to their low cost. They are readily available in arc segments, blocks, rings and discs. Principal applications are DC motors, loudspeakers, reed switch operation, magnetic separator assemblies and general holding devices such as pot magnets. The unmagnetized blocks are machined using diamond cutting machines to match customers' exact specification.

        Ferrite has an excellent resistance to demagnetization and can be magnetized before or after assembly without danger of losing any performance. It can be used in operating temperatures ranging from -40°C to + 250°C. However it does have a poor temperature coefficient losing approximately 0.2% of remanence per degree C when heated above zero.

        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 DC motors, ring magnets for loudspeakers, disc magnets and block magnets for special applications.

         

        Chinese standard - SJ/T 10410 2000 permanent ferrite magnet standard

        Material

        Br

        HcB

        HcJ

        (BH) max

        mT

        KG

        KA/m

        KOe

        KA/m

        KOe

        Kj/m3

        MGOe

        Y8T

        200-235 

        2.0-2.35 

        125-160 

        1.57-2.01 

        210-280 

        2.64-3.52 

        6.5-9.5 

        0.8-1.2 

        Y20

        320-380 

        3.2-3.8 

        135-190 

        1.70-2.38 

        140-195 

        1.76-2.45 

        18.0-22.0 

        2.3-2.8 

        Y22H

        310-360 

        3.1-3.6 

        220-2500 

        2.77-3.14 

        280-320 

        3.52-4.02 

        20.0-24.0 

        2.5-3.0 

        Y23

        320-370 

        3.2-3.7 

        170-190 

        2.14-2.38 

        190-230 

        2.39-2.89 

        20.0-25.5 

        2.5-3.2 

        Y25

        360-400 

        3.6-4.0 

        135-170 

        1.70-2.14 

        140-200 

        1.76-2.51 

        22.5-28.0 

        2.8-3.5 

        Y26H

        360-390 

        3.6-3.9

        220-250 

        2.77-3.14 

        225-255 

        2.83-3.21 

        23.0-28.0 

        2.9-3.5 

        Y27H

        370-400 

        3.7-4.0 

        205-250 

        2.58-3.14 

        210-255 

        2.64-3.21 

        25.0-29.0 

        3.1-3.7 

        Y28

        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 

        3.8-4.0 

        230-275 

        2.89-3.46 

        235-290 

        2.95-3.65 

        27.0-32.0 

        3.4-4.1 

        Y30H-2

        395-415 

        3.95-4.15 

        275-300

        3.46-3.77 

        310-335 

        3.90-4.21 

        28.5-32.5 

        3.5-4.0 

        Y32

        400-420

        4.0-4.2 

        160-190 

        2.01-2.38 

        165-195 

        2.07-2.45 

        30.0-33.5 

        3.8-4.2

        Y33

        410-430 

        4.1-4.3 

        220-250

        2.77-3.14 

        225-255 

        2.83-3.21 

        31.5-35.0 

        4.0-4.4 

         

        MMPA (0100-87) - Permanent ferrite magnet industry standard of USA

        Material

        Br

        HcB

        HcJ

        (BH) max

        mT

        KG

        KA/m

        KOe

        KA/m

        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

        21.9

        2.75

        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

        288

        3.617

        280

        3.51

        30.4

        3.82

        C11

         430

        4.3

        200

        2.512

        204

        2.56

        34.4

        4.32

         

         

         

         

        Electronic Kiln for sintering ferrite magnets

         

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