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 Hard Ferrite (ceramic) magnets, composed of barium or strontium, 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 demagnetizaion, corrosion, and the advantageous pricing.
Ferrite magnets are manufactured by pressing, sintering, or injection molding. These magnets can be both anisotropic and isotropic. Anisotropic grades are oriented in the manufacturing direction and must be magnetized in the direction of orientation. Isotropic grades are not oriented and can be magnetized in any direction. |
Typical Magnetic Performance for Sintered Ferrite Magnet |
| Grade |
Br |
HcB |
HcJ |
(BH)max |
Curie Temp. |
Temp.Coe |
IEC standard |
[mT]
[Gs] |
[KA/m]
[Oe] |
[KA/m]
[Oe] |
[KJ/m3]
[MGOe]] |
[℃] |
[%/℃] |
IEC
Equivalent |
| Y10T |
200
2000 |
125
1600 |
210
2600 |
6.5
0.80 |
450 |
0.200 |
Ceramic 1 |
| Y20 |
360
3600 |
135
1700 |
140
1760 |
20.0
2.50 |
450 |
0.200 |
/ |
| Y25 |
380
3800 |
144
1800 |
150
1880 |
24.0
3.00 |
450 |
0.200 |
/ |
| Y30 |
390
3900 |
200
2500 |
188
2350 |
27.6
3.40 |
450 |
0.200 |
Ceramic 5 |
| Y33 |
410
4100 |
208
2600 |
212
2660 |
30.4
3.80 |
450 |
0.200 |
/ |
| Y35 |
415
4150 |
240
3000 |
244
3050 |
31.8
4.00 |
450 |
0.200 |
/ |
| Y30BH |
390
3900 |
240
3000 |
256
3200 |
27.6
3.40 |
450 |
0.200 |
Ceramic 8 |
| Y33BH |
400
4000 |
240
3000 |
244
3050 |
30.4
3.80 |
450 |
0.200 |
Ceramic 8B |
| Y25H |
370
3700 |
264
3300 |
312
3900 |
24.0
3.00 |
450 |
0.200 |
/ |
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| TYPICAL MAGNETIC PERFORMANCE For Bonded Ferrite Magnet |
| Grade |
Br |
HcB |
HcJ |
(BH)max |
Curie Temp. |
Temp.Coe |
working T. |
IEC standard |
[mT]
[Gs] |
[KA/m]
[Oe] |
[KA/m]
[Oe] |
[KJ/m3]
[MGOe]] |
[℃] |
[%/℃] |
[℃] |
IEC
Equivalent |
| FB11 |
63
630 |
50
6400 |
165
2100 |
1.0
0.1 |
450 |
0.190 |
250 |
HF 1/14P |
| FB31 |
135
1350 |
85
1060 |
175
2200 |
3.2
0.4 |
450 |
0.190 |
250 |
HF 3/18P |
| FB1A |
240
2400 |
175
2200 |
240
3000 |
11.0
1.4 |
450 |
0.190 |
250 |
HF 10/22P |
| FB2A |
290
2900 |
190
2380 |
226
2840 |
16.0
2.0 |
450 |
0.190 |
300 |
HF 16/21P |
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