Round Plastic Bonded NdFeB Magnet
Product Description
General Information
Collectively known as Rare Earth Magnets, Neodymium Iron Boron (NdFeB)
and Samarium Cobalt (SmCo) magnets are alloys of the Lanthanide group of
elements. Rare Earth magnets are the most advanced commercialized
permanent magnet materials today.
The Bonded NdFeB Magnets material can be produced with close tolerances
off tool, with little or no finishing required. The energy product of
the bonded form is much lower than that of the sintered form - up to 10
MGOe. The bonded NdFeB is isotropic and can be magnetized in any
direction, and with multiple poles.
Manufacturing Methods
Compression - this is a technique whereby a special form of NdFeB
powder is blended with a plastic carrier material, die pressed and then
heated. Parts made in this way can be of complex shapes and come off the
tool with close tolerances, requiring no further finish machining.
Injection - NdFeB powder is blended with a plastic material and
injection molded. The resulting parts have energy products in the 5 MGOe
range, but can be made with extremely intricate shapes.
Assemblies
We are able to manufacture metal and other components of finished sub assemblies using our CNC machining facilities.
Assemblies can be fabricated by adhering magnets with adhesives to suit
a range of environments, by mechanically fastening magnets, or by a
combination of these methods. Due to the relatively brittle nature of
these magnet materials, press fits are not recommended.
When multiple magnets are assembled in repelling positions, it is
advisable to use mechanical fastening in addition to adhesives, since if
adhesives were to give way, repelling magnets may dislodge and endanger
personnel using them. Our design engineering team will be happy to
assist you in designing housings for your magnet assemblies.
Surface Treatments
Epoxy coating is mostly common used for bonded NdFeB Magnets.
Machining
Bonded NdFeB is easily machined. Coolants must be used while machining
this material in order to avoid spontaneous combustion of powder.
Machining this material removes a layer of protective coating, and
re-coating for corrosion resistance may be necessary.
Magnetizing and Handling
Isotropic bonded NdFeB materials can be magnetized in any direction, or
with multiple poles. Special magnetizing fixtures are required in order
to achieve multiple pole magnetization. Such multiple pole fixtures may
cost several thousand dollars depending on complexity of design and
production rate requirements.
Temperature Effects
Magnetic properties of NdFeB deteriorate rapidly above about 130
Centigrade, depending on the grade of material, and the permeance
coefficient of the magnet in operation. The higher the permeance
coefficient the magnet operates at, the higher the temperature it will
withstand. High Hci NdFeB materials operating at a high permeance
coefficient can operate to about 210 Centigrade. Shapes, Sizes, and
Grades Available Isotropic bonded NdFeB can be specially formulated to
meet special requirements, with energy products from 1 to 10MGOe, as
required.
Magnetic Properties of plastic Bonded NdFeB:
| Grade | Remanence Br | Normal Coercivity Hcb | Intrinsic Coercivity Hcj | Max. Energy Product (BH)max | MaxOperating | Density |
| KGs | KOe | KOe | MGOe | ℃ | g/cm3 | |
| NEOBM-4 | 3.5-4.5 | 3.0-3.5 | 8-10 | 3.5-5.0 | 150 | 4.5-5.0 |
| NEOBM-6 | 5.0-6.0 | 4.0-4.5 | 8-10 | 5.0-7.0 | 150 | 5.8-5.8 |
| NEOBM-8 | 6.0-6.7 | 4.5-5.5 | 8-10 | 8.0-9.0 | 140 | 5.8-6.0 |
| NEOBM-8H | 5.6-6.5 | 5.0-5.8 | 13-17 | 7.5-9.0 | 120 | 5.6-6.0 |
| NEOBM-10 | 6.8-7.0 | 5.0-5.5 | 8-10 | 9.0-10.0 | 120 | 6.0-6.2 |
| NEOBM-12 | 7.0-8.0 | 5.2-6.0 | 8-11 | 10.0-12.0 | 130 | 6.2-6.6 |
| NEOBM-12D | 7.0-8.0 | 5.5-6.0 | 9-12 | 10.0-12.0 | 140 | 6.2-6.6 |
Physical Properties of plastic Bonded NdFeB:
| Average Reversible Temperature Coefficient | 0.09-0.1%/C |
| Coefficient of Thermal Expansion[25-200℃] | 4.8X10-6/℃ |
| Compressive Strength | 96Kg/cm |
| Curie Temperature Tc | 400℃ |
| Electrical Resistivity | 14000μΩ-cm |
| Hardness | 35-38HRB(NEOBM8/10/12) |
| Required Magnetizing Force [open Circuit] | >25KOe |
Coating of Plastic Bonded NdFeB:
| Surface Coating | Color | Quality | |
| Epoxy Coating | black | grey | good |
| Parylene Coating | Transparent | excellent | |
Dimension range of Plastic Bonded NdFeB:
| | Length mm (Outer Diameter) | Width mm (Inner Diameter) | Thickness mm | |||
| Min. | Max. | Min. | Max. | Min. | Max. | |
| Block | 5.0 | 100 | 5.0 | 100 | 0.8 | 50 |
| Ring | 5 | 100 | 3 | 95 | 0.8 | 50 |
Contact us if you need more details on Bonded NdFeB Magnet. We are ready to answer your questions on packaging, logistics, certification or any other aspects about Plastic Bonded NdFeB、Round Bonded NdFeB Magnet. If these products fail to match your need, please contact us and we would like to provide relevant information.
Product Categories : Permanent Magnets > Bonded NdFeB Magnets
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