BONDED NDFEB MAGNETS
Bonded NdFeB magnets, Plastic Bonded Neodymium Magnets, Permanent Bonded NdFeB Magnets
Bonded NdFeB magnets, Plastic Bonded Neodymium Magnets are manufactured by binding rapid-quenching NdFeB powder. The powder is mixed with resin to form a magnet by compression molding with epoxy or injection molding with nylon.
The latter technique is particularly effective in large volume production, though the magnetic value of products is lower than those made with compression molding because of their relatively lower density.
Various shapes of high dimensional accuracy can be produced without further processing. The surface is treated by epoxy coating or nickel-plating to prevent corrosion.
Hybrid magnets to create different magnetic properties
With different ratios of additives to NdFeB powder, magnetic properties of hybrid NdFeB magnets can be tuned in a wide range. Once the ratio is fixed, magnetic property fluctuation can still be limited in a narrow bank. Hybrid magnets will meet customers¡¯specified properties.
Characteristics for the initial magnetization of bonded NdFeB magnets:
Rapidly quenched NdFeB powder used for bonded magnets is multi-grain with a grain size of sub-micron. The powder is isotropic in magnetic properties, which results in a flat increase of remanence and intrinsic coercivity with the applied field. The magnet can only be magnetized to saturation in high fields.
Advantages of Plastic Bonded NdFeB Magnets:
*Produced with high efficiency, stability, and repeatability.
*Magnet and other parts may form together in one step.
*Free choice of magnetizing direction-especially for multi-polar applications
*High dimensional accuracy-large quantity applications with minimum post-press machining.
*Thin-wall ring and complex shape magnets.
*High resistance to corrosion.
Magnetic Properties Bonded NdFeB Magnets:
|
Code
|
Remanence Br
|
Coercivity Force
|
Intrinsic Coercivity
|
Maximum Energy
|
Curie
|
Maximum Operating
|
||||
|
Force
|
Product Bhm
|
Temperature
|
Temperature
|
|||||||
|
Br
|
bHc
|
iHc
|
(BH)max
|
TC
|
TW
|
|||||
|
Bonded
|
||||||||||
|
BDM-4
|
0.35-0.45
|
3.5-4.5
|
239-279
|
3.0-3.5
|
640-796
|
8-10
|
24-32
|
3-4
|
320
|
120
|
|
BDM-6
|
0.5-0.60
|
5.0-6.0
|
318-358
|
4.0-4.5
|
640-796
|
8-10
|
40-56
|
5-7
|
390
|
120
|
|
BDM-8
|
0.55-0.65
|
5.5-6.5
|
358-398
|
4.5-5.0
|
955-1115
|
12-14
|
60-80
|
5-8.5
|
470
|
150
|
|
BDM-10
|
0.65-0.70
|
6.5-7.0
|
398-439
|
5.0-5.5
|
640-796
|
8-10
|
72-80
|
9-10
|
470
|
150
|
|
BDM-12
|
0.70-0.8
|
7.0-8.0
|
439-478
|
5.5-6.0
|
717-876
|
9-11
|
80-96
|
10-12
|
470
|
>=80
|
|
BDM-L
|
0.70-0.8
|
7.0-8.0
|
159-199
|
2.0-2.5
|
175-239
|
2.2-3.0
|
36-52
|
4.5-6.5
|
320
|
>=80
|
Applications of Bonded NdFeB Magnets:
- The bonded compression-molded NdFeB magnets can be used micro motors：rain brush motor、step Motors 、 Motors of CD-ROM, DVD and Walkman & Vibration Motors of the mobile phone, etc;
- Other applications include brushless motor 、Speaker、Buzzers and Toys etc.
Safety Notes for the Use and Storage of Bonded NdFeB Magnets.
*Do not place magnets near a person wearing electrical medical equipment.such as a pacemaker, because the magnet may result in a malfunction of the equipment and endanger a person’s life.
*Keep magnets away from magnetic memory media or other magnetic field sensitive devices such as magnetic cards. tapes, floppy disks, hard disk drivers, and watches. Otherwise, information stored in the media or the devices may be damaged.
*Big block of the magnet will strongly attract each other or attract iron steel pieces, which may cause serious injuries to a person.
*Relatively weak in strength, bonded magnets may break into pieces when colliding with other materials. Be careful in assembling magnets and prevent the fine fragments from entering into eyes or cause other injuries.
*Keep magnets in good condition and avoid following environment in case that magnets become rust or weaken in mechanical or magnetic strength.
- With acid, alkali, organic solvent, or electrolytes.
- Immersed in water or in oil.
- Space filled with hydrogen.
- Space filled with corrosive gases such as Cl2, NH3, Nox, etc.
- With radioactive rays.
Surface Treatment of Bonded NdFeB Magnets:
We provide high-quality Epoxy and Acrylic electrophoresis, Epoxy and Teflon spray, Parylene surface treatment, to guarantee our product application in harsh environments. Surface treatment solutions for one application can be adjusted according to the practical environment.