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rare earth permanent magnets, bonded neodymium iron boron, NdFeB magnetsBonded NdFeB magnets, i.e. bonded neodymium iron boron magnets, are those permanent magnetic materials made of rapid quenched NdFeB magnetic powders combined with resin binders (epoxy, Nylon/polyamide (PA), polyphenylene sulfide (PPS), etc). They are manufactured through a bonded process (compression, injection, extrusion or calendaring molding), so it is available to obtain complex geometries with high dimensional precision. Controlling the performance and proportion of NdFeB magnetic powders, it is able to adjust the magnets’ magnetic properties in a continuous range.

Due to their complex geometries availability, high dimensional precision, uniform magnetic properties, diverse magnetization patterns, good corrosion resistance and mechanic properties, bonded NdFeB magnets are widely applied in spindle motors, micro motors, direct current (DC) motors, synchronous motors, power tools, magnetic rollers, Hall effect sensors, etc.

>> Bonded NdFeB Magnets’ Grades and Their Magnetic Properties

Grade Br Hcb Hcj (BH)max Tw
kGs T kOe kA/m kOe kA/m MGOe kJ/m3
HGT-12 7.0-7.6 0.70-0.76 5.7-6.2 454-493 8-11 637-875 10.0-11.5 80-92 ≤150
HGT-11 6.8-7.3 0.68-0.73 5.6-6.0 446-477 8-11 637-875 9.5-10.5 76-84 ≤150
HGT-10H 6.4-6.9 0.64-0.69 5.5-5.9 438-469 10-13 796-1035 9.0-10.0 72-80 ≤180
HGT-10 6.6-7.2 0.66-0.72 5.4-6.0 430-477 8-10 637-796 9.5-10.5 76-84 ≤160
HGT-9 6.3-6.9 0.63-0.69 5.2-5.8 414-462 8-10 637-796 8.5-9.5 68-76 ≤160
HGT-8H 6.0-6.6 0.60-0.66 5.0-5.6 398-446 10-13 796-1035 8-9 64-72 ≤180
HGT-8 5.8-6.4 0.58-0.64 4.8-5.4 382-430 8-10 637-796 7.5-8.5 60-68 ≤160
HGT-7 5.3-5.9 0.53-0.59 4.6-5.2 366-414 8-10 637-796 6.5-7.5 52-60 ≤160
HGT-6 4.8-5.4 0.48-0.54 4.4-5.0 350-398 8-10 637-796 5.5-6.5 44-52 ≤160
HGT-5 4.3-4.9 0.43-0.49 4.0-4.6 318-366 7-9 557-716 4.5-5.5 36-44 ≤150
HGT-4 3.8-4.4 0.38-0.44 3.5-4.2 279-334 7-9 557-716 3.5-4.5 28-36 ≤150
HGT-3 3.4-4.0 0.34-0.40 3.2-3.8 255-302 7-9 557-716 2.5-3.5 20-28 ≤150
HGT-2 3.0-3.6 0.30-0.36 2.8-3.6 223-286 7-9 557-716 2-3 16-24 ≤150
Note:
∗ The data in the above table were samples’ results tested at the temperature of 20 °C.
∗ The temperature coefficients of Br and Hcj are α(Br): -0.10~-0.13 %/ºC and β(Hcj): -0.40~-0.60 %/ºC, respectively.
∗ The above data are only for reference, magnets can be tailored according to customers’ personalized requirements.

>> Bonded NdFeB Magnets' Shapes

bonded NdFeB magnets, neodymium iron boron, rare earth permanent magnets, ring magnets

Ring Magnets

Abnormal Shapes, Bonded NdFeB Magnets, rare earth permanent magnets, neodymium iron boron, sensors

Abnormal Shape Magnets

bonded NdFeB magnets with metal, neodymium iron boron, rare earth permanent magnets, hall effect, sensors, encoders

Magnetic Assemblies with Metal

Bonded NdFeB Magnets, neodymium iron bron, rare earth permanent magnets, magnetic assembly, Rotor Assemblies with Plastic

Rotor Assemblies

bonded NdFeB magnets, neodymium iron boron, rare earth permanent magnets, arc magnets, segment magnets

Arc/Segment Magnets

bonded NdFeB magnets, neodymium iron boron, rare earth permanent magnets, block magnets

Block/Rectangular Magnets

Note:
∗ Other shapes of bonded NdFeB magnets can also be tailored according to customers' specific requirements.

>> Bonded NdFeB Magnets’ Coating Types

Bonded NdFeB magnets’ most common coating is epoxy. In addition, Teflon and Parylene coating types are also available.

>> Some Physical Properties of Bonded NdFeB Magnets

Parameter Unit Value
Density (ρ) g/cm3 4.0-6.5
Curie Temperature (Tc) ºC 300-350
Recoil Permeability (μrec) - 1.20
Rockwell Hardness (HR) MPa 35-45
Compressive Strenght (σbc) MPa 800-1000
Tensile Strength (σb) MPa 200
Thermal Expansivity (α) 10-6/ºC 1-2
Note:
∗ The above data are only for reference, specific magnets maybe have different values.