D21.3-02 RoHs Customized Bonded Neodymium-Iron Boron Magnets
Bonded NdFeB magnets
Bonded Neodymium magnets are made of strong Nd-Fe-B material mixed
into an epoxy binder. The mixture is approximately 97 vol% magnet
material and 3 vol% epoxy resin. The manufacturing process involves
mixing Nd-Fe-B powder with an epoxy binder, then compressing the
mixture in a press and curing the part in an oven. Because the
material is formed by crimping, dimensions typically vary by 0.002
inches or better for a given run.
Bonded Neodymium Iron Boron (NdFeB) magnets are strong magnets for
a variety of applications. Epoxy coating is mostly used to bond
NdFeB magnets; electroless nickel plating is also used to prevent
corrosion. Isotropically bonded NdFeB materials can be magnetized
in any direction or multi-pole.
The bonded Nd-Fe-B material is isotropic and thus can be magnetized
in any direction, including multipolar arrangements. Since the
material has an epoxy adhesive, it can be machined on a milling
machine or lathe. However, the material does not support threads
and therefore cannot be tapped. Bonded Nd-Fe-B materials are often
used to drastically reduce the size of designs using ceramic magnet
materials. Since the material is about three times stronger than
ceramic magnet materials, it can be significantly reduced in size.
Furthermore, since the material is isotropic, it can be magnetized
with multiple poles, such as an N-S-N-S pattern on the outer
diameter of the ring.
| Production List |
| Series | 0806 | 10-8 | 1208 | 1309 | 1309A | 1412 | 1507 | 1509 | 1510 | 1610 | 1609D |
magnetic Powder
VSM | Br | 7.00~7.20 | 7.60~7.75 | 8.10~8.30 | 8.40~8.55 | 8.5-8.7 | 8.45-8.65 | 9.2-9.45 | 8.85-9.1 | 8.85-9.1 | 9.05-9.2 | 8.85-9.2 |
| kGs |
| Hcj | 5.00~7.50 | 7.80~8.80 | 8.00~8.80 | 9.00~9.80 | 9-9.8 | 12-12.7 | 6.8-7.8 | 9.2-9.8 | 10-10.8 | 9.3-10.1 | 9.2-9.8 |
| kOe |
| Hcb | 4.30-5.00 | 5.20~5.60 | 5.80~6.30 | 6.20~6.80 | 6.2-6.8 | 6.7-7.2 | 5.5-6 | 6.4-6.9 | 6.4-6.9 | 6.7-7.2 | 6.7-7.2 |
| kOe |
| (BH)max | 8.80-9.30 | 11.70~12.10 | 13.00~13.80 | 14.20~14.80 | 14.2-15.1 | 14.4-15.2 | 15-16 | 15.5-16.3 | 15.5-16.3 | 16.5-17.5 | 16.5-17.5 |
| MGOe |
magnet
D10样柱 | Br | 5.50~5.90 | 6.00~6.15 | 6.35~6.50 | 6.60~6.80 | 6.6-6.9 | 6.7-6.8 | 7.3-7.5 | 6.9-7 | 6.9-7 | 7.05-7.15 | 7.05-7.15 |
| kGs |
| Hcj | 5.00~7.50 | 7.80~8.80 | 8.00~8.80 | 9.00~9.80 | 9-9.8 | 12-12.7 | 6.8-7.8 | 9.2-9.8 | 10-10.8 | 9.3-10.1 | 9.2-9.8 |
| kOe |
| Hcb | 3.80~4.40 | 4.80~5.10 | 5.10~5.40 | 5.40~5.80 | 5.4-5.8 | 5.7-5.9 | 5.3-5.5 | 5.7-6 | 5.7-6 | 5.7-6.2 | 5.8-6.2 |
| kOe |
| (BH)max | 6.00~6.40 | 7.40~7.70 | 8.30~8.70 | 8.90~9.30 | 9-9.4 | 9.6-9.8 | 10.3-10.5 | 9.9-10.3 | 9.9-10.3 | 10.2-10.6 | 10.2-10.6 |
| MGOe |
Magnetic Perfomance Parameter
| Isotropic Compression Bonded NdFeB | Remanence | Intrinsic Coercivity | Coercivity | Maximum Magnetic
Energy Product | Working
Temp. | Advantages |
| Br | Hcj | Hcb | BH(max) | Temp | 1,Various shapes(ring,arc segment,strange shaped)；
2,Various magnetic orientation, low eddy loss;
3,Rotate stably,low noise,save electricity. |
| kGs | mT | kOe | kA/m | kOe | kA/m | MGOe | kJ/m3 | ℃ |
| 5.5-7.6 | 550-760 | 6-15 | 470-1200 | 3.5-6.5 | 278-520 | 5-11.5 | 40-92 | 80 ～ 150 |
|
Anisotropic
Compression Bonded NdFeB | Remanence | Intrinsic Coercivity | Coercivity | Maximum Magnetic
Energy Product | Working
Temp. | Advantages |
| Br | Hcj | Hcb | BH(max) | Temp | 1,Higer magnetic energy, compares to Isotropic compression bonded
NdFeB；
2,Process to ring, low eddy loss；
3,Rotate stably at high RPM, low noise. |
| kGs | mT | kOe | kA/m | kOe | kA/m | MGOe | kJ/m3 | ℃ |
| 8.5-10.6 | 850-1060 | 12-17 | 950-1350 | 6.7-8.2 | 530-650 | 13-21 | 102-170 | 80 ～ 150 |
Production processes of compression bonded NdFeB magnet:
Isotropic Material
Magnetic powder&Couple Agent→Binding→Materials→Pressing/Forming
(Magnetic filed free)→Curing→Surface
Treatment→Magnetizing→Inspection→Packing→Delivery
Anisotropic Material
Magnetic powder&Couple Agent→Binding→Materials→Pressing/Forming
(With Magnetic filed)→Demagnetizing→Curing→Surface
Treatment→Magnetizing→Inspection→Packing→Delivery
Maximum operating temperature
Although the Curie temperature of NdFeB materials is around 310 ºC
for 0% cobalt and higher than 370 ºC for 5% cobalt, some
irreversible output loss may occur even at moderate temperatures.
The new magnets also have a moderately high reversible temperature
coefficient of induction, with the total magnetic output decreasing
with increasing temperature. The choice of neodymium magnets over
SmCo is a function of the maximum temperature of the application,
the desired magnetic output at typical operating temperatures, and
the total system cost.
The new magnet also has some limitations due to its corrosive
behavior. In wet environments, a protective coating or
electroplating is strongly recommended. Coatings that have been
successfully applied include: electronic coatings, powder coatings,
nickel plating, zinc plating, parylene, and combinations of these
coatings.
Features
1.Max. Working temp.160℃;
2.Molding processed, economical and full automated manufacturing;
3. Reliable corrosion resistance, various coatings (Epoxy,
parylene, Everlube, paint, etc.) ensure corrosion resistance and
product appearance;
4. Magnetized methods variously, multipole axially, radially with
skew angle, Halbach Array. Make motors performances more efficient,
less noise at high speed rotation.
