Different grades of Bonded NdfeB Magnet

Bonded NdFeB, composed of Nd2Fe14B, is a synthetic magnet. It is a magnet made by mixing quick-quenched NdFeB magnetic powder and binder through "compression molding" or "injection molding". Pressed NdFeB magnets and injection-molded neodymium Iron boron magnets are the most commonly used among them.

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Bonded NdFeB magnet features: 1. Magnetic property between sintered NdFeB magnet and ferrite magnet, it is a high performance isotropic permanent magnet with good consistency and stability. 2. Can be made into permanent magnets of small sizes, complex shapes and high geometric accuracy with press moulding and injection moulding. Easy to achieve large-scale automated production. 3. Can be magnetized via any direction. Multi poles or even countless poles can be realized in bonded NdFeB. 4. Bonded NdFeB magnets are widely used in all kinds of micro motors, such as spindle motor, synchronous motor, stepper motor, DC motor, brushless motor, etc.Magnetic Characteristics and Physical Properties of Bonded Compression Injection Moulding NdFeB
Grade SYI-3 SYI-4 SYI-5 SYI-6 SYl-7 SYI-6SR(PPS)
Residual Induction (mT) (KGs) 350-450 400-500 450-550 500-600 550-650 500-600
(3.5-4.5) (4.0-5.0) (4.5-5.5) (5.0-6.0) (5.5-6.5) (5.0-6.0)
Coercive Force (KA/m) (KOe) 200-280 240-320 280-360 320-400 344-424 320-400
(2.5-3.5) (3.0-4.0) (3.5-4.5) (4.0-5.0) (4.3-5.3) (4.0-5.0)
Intrinsic Coercive Force (KA/m) (KOe) 480-680 560-720 640-800 640-800 640-800 880-1120
(6.5-8.5) (7.0-9.0) (8.0-10.0) (8.0-10.0) (8.0-10.0) (11.0-14.0)
Max. Energy Product (KJ/m3) (MGOe) 24-32 28-36 32-48 48-56 52-60 40-48
(3.0-4.0) (3.5-4.5) (4.5-6.0) (6.0-7.0) (6.5-7.5) (5.0-6.0)
Permeability (μH/M) 1.2 1.2 2.2 1.2 1.2 1.13
Tempetrature Coefficient (%/℃) -0.11 -0.13 -0.13 -0.11 -0.11 -0.13
Curie Temperature (℃) 320 320 320 320 320 360
Max.Work  Temperature (℃) 120 120 120 120 120 180
Magnetizing Force (KA/m) (KOe) 1600 1600 1600 1600 1600 2000
20 20 20 20 20 25
Dendity (g/m3) 4.5-5.0 4.5-5.0 4.5-5.1 4.7-5.2 4.7-5.3 4.9-5.4
It has four production methods, the first is pressing molding. (The magnetic powder and the adhesive are mixed evenly in a volume ratio of about 7:3, rolled to the required thickness and then solidified to make a finished product), the second is injection molding. (Mix the magnetic powder with the binder, heat and knead, pre-granulate, dry, and then send the spiral guide rod to the heating room for heating, inject it into the mold cavity for molding to get the finished product after cooling), the third is extrusion molding. (It is basically the same as the injection molding method, the only difference is that after heating, the pellets are extruded into the mold through a cavity for continuous molding), and the fourth is compression molding(Mix the magnetic powder and binder according to the ratio, granulate and add a certain amount of coupling agent, press into the mold, solidify at 120°~150°, and finally get the finished product.) The disadvantage is that the bonding NdFeB starts late, and the magnetic properties are weak, besides, the application level is narrow, and the dosage is also small. Its advantages are high remanence, high coercive force, high magnetic energy product, high performance-price ratio, one-time forming without secondary processing, and can be made into various complex-shaped magnets, which can greatly reduce the volume and weight of the motor. And it can be magnetized in any direction, which can facilitate the production of multi-pole or even infinite pole overall magnets. It is mainly used in office automation equipment, electrical equipment, audio-visual equipment, instrumentation, small motors and measuring machinery, mobile phone vibration motors, printer magnetic rollers, power tool hard disk spindle motors HDD, other micro DC motors and automation instruments.

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