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Sintered Hard Ferrite magnet |
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| Produced is used in many fields, and is manufactured by powder metallurgy. Properties includes isotropy and anisotropy with Ba and Sr. This permanent magnet has difficult demagnetization, is rust resistant, and can work at 250℃. Ferrite is rigid and crisp, can be cut and machined using diamonds, dies are made with steel alloy. It is mainly used in permanent magnetic motors and speakers. |
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| Magnetic Properties of Sintered Hard Ferrite |
| Chinese standard |
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Grade
|
Remanence
|
Coercivity Force
|
Intrinsic Coercive Force
|
Max.Energy Product
|
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Br
|
Hcb
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Hcj
|
（ BH ） max
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mT
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kGs
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kA/m
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kOe
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kA/m
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kOe
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kJ/m3
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MGOe
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Y10T
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200-235
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2.0-2.35
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125-160
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1.57-2.01
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210-280
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2.64-3.52
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6.5-9.5
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0.8-1.2
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Y20
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320-380
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3.2-3.8
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135-190
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1.70-2.38
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140-195
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1.76-2.45
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18.0-22.0
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2.3-2.8
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Y22H
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310-360
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3.1-3.6
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220-250
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2.77-3.14
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280-320
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3.52-4.02
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20.0-24.0
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2.5-3.0
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Y23
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320-370
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3.2-3.7
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170-190
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2.14-2.38
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190-230
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2.39-2.89
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20.0-25.5
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2.5-3.2
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Y25
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360-380
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3.6-4.0
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135-170
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1.70-2.14
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140-200
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1.76-2.51
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22.5-28.0
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2.8-3.5
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Y26H
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360-390
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3.6-3.9
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220-250
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2.77-3.14
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225-255
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2.83-3.21
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23.0-28.0
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2.9-3.5
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Y27H
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370-400
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3.7-4.0
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205-250
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2.58-3.14
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210-255
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2.64-3.21
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25.0-29.0
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3.1-3.7
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Y30
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370-400
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3.7-4.0
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175-210
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2.20-2.64
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180-220
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2.26-2.77
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26.0-30.0
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3.3-3.8
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Y30BH
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380-390
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3.8-3.90
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223-235
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2.80-2.95
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231-245
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2.90-3.08
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27.0-30.0
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3.4-3.7
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Y30-1
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380-400
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3.8-4.0
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230-275
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2.89-3.46
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235-290
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2.95-3.65
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27.0-32.0
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3.4-4.0
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Y30H-2
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395-415
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3.95-4.15
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275-300
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3.46-3.77
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310-335
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3.90-4.21
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28.5-32.5
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3.5-4.0
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Y32
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400-420
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4.0-4.2
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160-190
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2.01-2.38
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165-195
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2.07-2.45
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30.0-33.5
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3.8-4.2
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Y33
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410-430
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4.1-4.3
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220-250
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2.77-3.14
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225-255
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2.83-3.21
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31.5-35.0
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4.0-4.4
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Y35
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400-410
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4.00-4.10
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175-195
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2.20-2.45
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180-200
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2.26-2.51
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30.0-32.0
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3.8-4.0
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| USA standard |
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Grade
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Remanence
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Coercivity Force
|
Intrinsic Coercive Force
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Max.Energy Product
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Br
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Hcb
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Hcj
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（ BH ） max
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mT
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kGs
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kA/m
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kOe
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kA/m
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kOe
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kJ/m3
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MGOe
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C1
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230
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2.3
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148
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1.86
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258
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3.5
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8.36
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1.05
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C5
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380
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3.8
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191
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2.4
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199
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2.5
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27
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3.4
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C7
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340
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3.4
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258
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3.23
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318
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4
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21.9
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2.75
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C8(=C8A)
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385
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3.85
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235
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2.95
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242
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3.05
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27.8
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3.5
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C8B
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420
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4.2
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232
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2.913
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236
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2.96
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32.8
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4.12
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C9
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380
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3.8
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280
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3.516
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320
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4.01
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26.4
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3.32
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C10
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400
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4
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288
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3.617
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280
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3.51
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30.4
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3.82
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C11
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430
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4.3
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200
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2.512
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204
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2.56
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34.4
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4.32
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| Physical Properties of Hard Ferrite Magnets |
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Parameters
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Mark
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Unit
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Values
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Remark
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Recoil Permeability
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rec
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Gs/Oe
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1.05-1.3
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Curie Temperature
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Tc
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℃
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≥ 450
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Temp. Coefficient of Magnetic Induction
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A(Br)
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℃ -1
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-0.2%
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0-100 ℃
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Temp. Coefficient of Inturensic Coerrice Induction
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A(Hcj)
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℃ -1
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-0.2-0.5%
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0-100 ℃
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Density
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D
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G/cm3
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4.6-5.0
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Specific Resistance
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Ω .cm
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≥ 10 6
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Coefficient of Thermal Expansion
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A
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℃ -1
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7-15X10 -6
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Hardness
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HV
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--
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480-580
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| Process of Hard Ferrrite Magnets |
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