Injection Bonded NdFeB Magnet

Injection Polymer Bonded NdFeB Magnet
injection polymer bonded ndfeb compound

Yuxiang always supply the clients with top grade Injection Bonded NdFeB Magnet (Injection Molded Plastic NdFeB magnets), which is a new type of compounded permanent magnetic material. Injection Bonded NdFeB Magnet is a kind of new-generation composite material made from permanent magnetic powder and plastic, has outstanding magnetic properties and plastic properties and features high size precision and exceptional shock resistance. It mixes the powder of permanent magnetic material (ferrite, NdFeB, Sm2Co17 and AlNiCo) and hot plastic powder, which will be fitting and granulated by a special magnet extrusion granulation machine, and further shaped by a special magnetic field injection moulding machine. The injection molded process allows for moulding directly on, in or over other components thereby reducing secondary processing costs. The importance of the injection molded magnets lies in its cost effectiveness, very simple shapes or very complex can be molded into directly. Moreover, all or some part of the device can be magnetized. Injection bonded magnets offer a combination of high magnetic strength and excellent physical properties. They offer large scale manufacture of shaped parts of close dimensional and magnetic tolerances. As smaller more efficient designs are therefore available then with increased design freedom lower losses of magnetism can be achieved. Typical tolerances will depend largely on the part configuration and the type of tooling selected. The material for any specification of Injection bonded magnets is chosen based on many factors for example temperature, strength, water absorption, solvent resistance, complexity of shape and compatibility with the magnet power.

Characteristics & Application of Injection Bonded NdFeB Magnet:

Characteristics: good at consistency, recombination compaction, flexible in magnetized orientation and with high mechanical strength. Having high dimensional precision and impact-resistance. Capable of forming products with inlay; Versatile shapes and specification; Impact-resistant; advanced surface treatment technology, effectively protect; Integrated forming

Applications: Copier and laser printer rolls; Permanent motor magnets; Magnetic rings for aerodynamic component; Color Monitor/TV purity convergence magnet; office equipment, instrument, meter, and beeper. rotors & other components. Magnet stators for fractional horsepower D.C. motors. Multi-pole magnetic motors for brushless D.C. and stepping motors. Magnetic actuators for magnetic switches and solenoids. Sensors for activators and industrial applications. Time gauge.

Br (mT) 400-490 490-570 480-560 700-800
bHc(kA/m) 256-312 312-384 336-400 382-430
iHc(kA/m) 576-736 640-800 960-1360 680-840
(BH)max(kJ/m3) 28-36 40-56 44-60 60-68
Recoil permeability 1.1-1.22 1.1-1.22 1.1-1.22 1.1-1.22
Recoil temperature coeffiient of Br. (%/℃) -0.10
Magnetizing field (Ka/m) ≥1592 ≥1592 ≥1990 ≥1592
Density(g/cm3) 4.0-4.5 4.5-5.5 5.0-5.5 5.0-5.5
Ring crushing strength constant (N/mm2) > 78 > 78 > 78 > 78

Injection Bonded Anisotropic NdFeB Magnet

The common molding technics of anisotropic ndfeb magnet are injection molding and compression molding. Two major application samples of anisotropic ndfeb magnet are sensor magnet and expansion valve.

Injection bonded ndfeb sensor magnets made by HDDR ndfeb powder are widely used for auto speedometer, speed sensor, water temperature sensor etc. The surface magnetic field can reach 3000GS upwards, needle axis remained in the body of ndfeb magnet when injection molded, which is in favor of forming the excellent maving balance.

Electric expansion valve adopts HDDR injection magnetic ring that made by anisotropic ndfeb powder features good properties 30%~60% higher than other expansion valves made by common anisotropic ndfeb ring, thus, it can highly advance energy-efficiency-rate of air conditioner, and promotes the development of frequency conversion air conditioner towards energy-saving and environment-protection.

Properties Unit YAHM-11 YAHM-13 YAHM-15 YAHM-17 YAHM-19 YAHM-21
Residual Induction Br T 0.65-0.7 0.7-0.75 0.75-0.83 0.88-0.93 0.95-1.0 1.0-1.05
kGs 6.5-7.0 7.0-7.5 7.5-8.3 8.8-9.3 9.5-10.0 10.0-10.5
Coercive Force Hcb kA/m 457-477 477-517 477-533 517-565 517-565 557-629
kOe 6.0-6.5 6.0-6.5 6.0-6.7 6.5-7.1 6.5-7.1 7.0-7.9
Intrinsic Coercive Force Hcj kA/m 875-1035 875-1035 875-1035 875-1035 875-1035 915-1035
kOe 11.0-13.0 11.0-13.0 11.0-13.0 11.0-13.0 11.0-13.0 11.5-13.0
Maximum Energy Product (BH)max kJ/m3 72-88 87-103.5 103.5-119 123-135 135-151 151-167
MGOe 11-13 11-13 13-15 15.5-17.0 17-19 19-21
Recoil Permeability μ   1.10-1.20 1.10-1.20 1.10-1.20 1.10-1.20 1.10-1.20 1.10-1.20
Temperature Coefficient of Br %/℃ -0.13 -0.13 -0.13 -0.12 -0.12 -0.12
Temperature Coefficient of Hcj %/℃ -0.5 -0.5 -0.5 -0.55 -0.55 -0.55
Forming Method   Injection Molded Compression Molded