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hd@hdmagnet.com
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Ferrite magnet is sintered material by powder metallurgy and its main component is iron oxide. Its chemical formula is xCo3+ 6Fe2O3 and Barium (Ba) or Strontium (Sr) is added depending on the use.
Depending on the processing method, it is classified into dry process using adhesive special power and wet process using water. It is divided into isotropic and anisotropic material based on the magnetic direction.
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 Uses |
| It is used in a wide range of areas including automotive parts, stationeries, baby products, medical products, electronics, molds, shipbuilding materials, etc. |
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Type |
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- Anisotropic Ferrite (ANISOTROPIC FERRITE)
Strontium Type (SrCo3ㆍ6Fe2O3)
Anisotropic magnets are made with very fine particles that aligns magnetic direction to a certain direction. After magnetization, it becomes a strong anisotropic coercive magnet.
Depending on the part used during magnetization, it can strengthen the magnetic force.
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- Isotropic Ferrite (ISOTROPIC FERRITE)
Barium Type (BaCO3ㆍ6Fe2O3)
Isotropic has easier process and mixture of materials than anisotropic magnet.
It is economic and used widely.
(Isotropic has weak Gauss (G).)
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Features |
- It has relatively good thermal stability.
- It is the same as powder metallurgy, thus, complex shapes can be produced efficiently using a mold.
- In contrast from isotropic material, anisotropic material is a strong magnetic material with additives synthesized at a high temperature. It has superior magnetic properties than isotropic material.
- Anisotropic magnets have particles aligned top-down or in a certain direction in contrast to isotropic magnet.
- Isotropic magnets have weaker magnetic force than anisotropic magnets but it is economic and can be magnetized arbitrarily.
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| (단위 : mm) |
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Material |
GAUSS |
Operation Temperature |
Residual Magnetic Flux Density Br-KG |
Coercivity Hc-KEr |
Max. Energy (BH)max-MGEr |
Characteristic |
| FERRITE |
BA(SR)O-FE203 |
600-1900 |
250°C |
4.4 |
2.8 |
4.6 |
Arbitrary Magnetization Possible |
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Pysical Property |
| Properties |
Numerical Value |
Unit |
| Curie point |
450-460 |
℃ |
| Thermal conductivity |
0.003 |
cal/Cm S.℃ |
| Electrical resistance |
>10⁴ |
Ω-Cm |
| Density |
4.8-5.1 |
g/㎤ |
| Temperature coefficient at the operating point |
-0.2 |
%/℃ |
| Deflective strength |
5-10 |
㎏/㎟ |
| Linear expansion coefficient |
Anisotropic direction |
14~ 15x10-6 |
/℃ |
| At right angles to the anisotropic direction |
9~ 10x10-6 |
/℃ |
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Magnetic Property |
| Material |
Br |
HcB |
HcJ |
(BH) max |
| mT |
KG |
KA/m |
Koe |
KA/m |
Koe |
Kj/㎥ |
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 |
| Y2O |
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 |
220~250 |
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~ |
2.20~2.64 |
180~220 |
2.26~277 |
26.0~30.0 |
3.3~3.8 |
| Y30H-1 |
380~400 |
3.8~4.0 |
30~275 |
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 |
220~255 |
2.83~3.21 |
31.5~35.0 |
4.0~4.4 |
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Production Process Overview |
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Specifications |
DISK TYPE
| (Unit : mm) |
| DISK TYPE (O.DØ
× Width T) |
| Ø10 × 3T |
Ø15 × 3T |
Ø22 × 10T |
| Ø10 × 6T |
Ø15 × 5T |
Ø25 × 3T |
| Ø10 × 8T |
Ø17.5 × 5.3T |
Ø25 × 5T |
| Ø12 × 3T |
Ø20 × 3T |
Ø30 × 8T |
| Ø12 × 3.8T |
Ø20 × 5T |
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※ Custom products are available outside the specifications.
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SQUAR TYPE
| (Unit : mm) |
| SQUAR TYPE (Width × Height × Width T) |
| □15 × 13 × 4T |
□25 × 8 × 5T |
□50.8 × 12.7 × 12.7T |
| □19 × 12 × 10T |
□40 × 25 × 9T |
□90 × 34 × 20T |
| □20.5 × 20.5 × 16T |
□40 × 25 × 10T |
□100 × 30 × 20T |
※ Custom products are available outside the specifications.
※ Cutting machining Block.
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BLOCK TYPE
| (Unit : mm) |
| BLOCK TYPE (Width × Height × Width T) |
| □100 × 100 × 3T
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□100 × 100 × 10T
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□150 × 100 × 16T
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| □100 × 100 × 4T
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□150 × 100 × 9T
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□150 × 100 × 18T
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| □100 × 100 × 5T
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□150 × 100 × 10T
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□150 × 100 × 20T
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| □100 × 100 × 6T
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□150 × 100 × 12T
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□150 × 100 × 23T
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| □100 × 100 × 7T
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□150 × 100 × 13T
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□150 × 100 × 25.4T
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| □100 × 100 × 8T
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□150 × 100 × 15T
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※ Custom products are available outside the specifications.
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RING TYPE
| (Unit : mm) |
| RING TYPE (O.DØ
× I.DØ × Width T) |
| Ø20 × Ø10 × 3T |
Ø45 × Ø22 × 6,7,8,9,10T |
Ø85 × Ø33 × 11,13T |
| Ø20 × Ø10 × 3.7T |
Ø45 × Ø22 × 10.5T |
Ø85 × Ø32 × 15T |
| Ø20 × Ø10 × 5T |
Ø50 × Ø22 × 7T |
Ø90 × Ø45 × 15T |
| Ø21 × Ø13 × 4.5T |
Ø50 × Ø25 × 7,8,9T |
Ø90 × Ø50 × 15T |
| Ø27 × Ø12.5 × 3,5,7,8T |
Ø55 × Ø25 × 7,8,9T |
Ø100 × Ø60 × 15,20T |
| Ø27 × Ø17 × 3,5,6T |
Ø55 × Ø21.5 × 11T |
Ø100 × Ø70 × 15,20T |
| Ø30 × Ø10 × 5T |
Ø60 × Ø32 × 6,7,8,9,10,12,15T |
Ø110 × Ø60 × 15,17,20T |
| Ø30 × Ø18 × 5,6,8T |
Ø60 × Ø25 × 7,8,9,10T |
Ø120 × Ø60 × 17,20T |
| Ø32 × Ø18 × 6,7,8T |
Ø60.5 × Ø21.5 × 11T |
Ø140 × Ø75 × 20T |
| Ø35 × Ø18 × 7T |
Ø65 × Ø32 × 8,10,15T |
Ø156 × Ø80 × 20T |
| Ø36 × Ø18 × 6,7,8T |
Ø70 × Ø32 × 8,10,12,15T |
Ø180 × Ø95 × 20T |
| Ø39 × Ø22.5 × 7T |
Ø75 × Ø32 × 10,12,15T |
Ø220 × Ø110 × 20T |
| Ø40 × Ø22 × 6,7,8T |
Ø80 × Ø40 × 8,10,12,15T |
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※ Custom products are available outside the specifications.
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