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Sintered NdFeB Magnet

Sintered NdFeB Magnet 1

Sintered NdFeB Magnet 2

What is sintered NdFeB magnet?
The sintered NdFeB magnet is a common type of neodymium iron boron magnet. It is the most powerful permanent magnet commercially available today, but it is prone to corrosion because one of its major constituents, namely iron, will react with air to get rusted. Therefore, protective coatings are applied to preserve the magnetic property, and the most commonly used coatings are NiCuNi, Zn and epoxy.

Why choose our sintered NdFeB magnet?
1. We have been dedicated to the production of NdFeB magnet for seven years, and all the manufacturing procedures, except electroplating, are finished on our own. We have assigned some specialized QC staff to strictly control the production quality of every step, mainly focusing on dimensional tolerance (usually within ±0.05mm) and magnetic property (remanence and surface magnetic flux density) to ensure the final product quality.

2. Our company introduces XRF coating thickness gauge to measure the thickness of coatings, while electric heat constant temperature blast drying oven and high pressure ageing tester are employed to detect the temperature resistance and service life of our sintered NdFeB magnet, respectively. Then, relevant test data are offered to customers who want to use our super strong magnet for motor, wind generation or industrial purposes.

What are the available models?
This rare earth magnet is provided in a broad range of grades (including N54) with maximum operating temperature of 230℃. The maximum diameter of a round NdFeB magnet is 220mm, while the maximum length of a rectangular NdFeB magnet reaches up to 250mm. The following table gives brief introduction on the technical performance of our sintered NdFeB magnet.

Technical Data
Grade Max. remanence Coercive force Intrinsic coercive force Max. energy product Working temperature Physical Properties
kGs kOe kOe MGOe Item Parameter Reference value
N54 15.1 ≥10.5 ≥11 55 ≤80 Additional magnetic properties Temperature coefficient of Br (α(Br)) / (%/K) -0.08~-0.12
N52 14.8 ≥10.5 ≥11 53 ≤80
N50 14.5 ≥11.0 ≥12 51 ≤80 Temperature coefficient of Hcj (β(Hcj)) / (%/K) -0.42~-0.07
N48 14.3 ≥11.0 ≥12 49 ≤80
N45 13.8 ≥11.0 ≥12 46 ≤80 Curie temperature (Tc) / K 310~380
N42 13.5 ≥11.0 ≥12 44 ≤80
N40 13.2 ≥11.0 ≥12 41 ≤80 Recoil permeability (μrec) 1.05
N38 13.0 ≥11.0 ≥12 40 ≤80
N35 12.2 ≥10.9 ≥12 36 ≤80
N52M 14.8 ≥13.3 ≥14 43 ≤100 Mechanical properties Density (g/cm3) 7.50~7.70
N50M 14.5 ≥13.1 ≥14 41 ≤100 Vickers hardness (Hv) 650
N48M 14.3 ≥12.8 ≥14 49 ≤100 Electrical resistivity (μΩm) 1.4
N45M 13.8 ≥12.4 ≥14 46 ≤100 Compressive strength (MPa) 1050
N42M 13.5 ≥12.1 ≥14 44 ≤100 Tensile strength (MPa) 80
N40M 13.2 ≥11.8 ≥14 41 ≤100 Bending strength (MPa) 290
N38M 13.0 ≥11.7 ≥14 40 ≤100 Thermal conductivity(W/(mK)) 6~8
N35M 12.2 ≥10.9 ≥14 36 ≤100 Young’s modulus (GPa) 160
N50H 14.5 ≥12.9 ≥16 51 ≤120 Coefficient of thermal expansion(C┴) / (10-6/K) -1.5
N48H 14.3 ≥12.7 ≥16 49 ≤120 Coefficient of thermal expansion(C║) / (10-6/K) 6.5
N46H 14.0 ≥12.5 ≥17 47 ≤120
N44H 13.7 ≥12.3 ≥17 45 ≤120
N42H 13.5 ≥12.1 ≥17 44 ≤120
N40H 13.2 ≥11.8 ≥17 42 ≤120 Note: These technical specifications are subject to change without prior notice.
N38H 13.0 ≥11.5 ≥17 40 ≤120
N35H 12.4 ≥11.0 ≥17 37 ≤120 Magnetic Parameter and Conversion Table
N33H 11.7 ≥10.5 ≥17 34 ≤120
N45SH 14.0 ≥12.5 ≥20 47 ≤150
N44SH 13.7 ≥12.3 ≥20 45 ≤150
N42SH 13.5 ≥12.1 ≥20 44 ≤150
N40SH 13.2 ≥11.8 ≥20 42 ≤150 Unit / Symbol SI-unit Conversion table
N38SH 12.9 ≥11.5 ≥20 40 ≤150
N35SH 12.4 ≥11.0 ≥20 37 ≤150 Magnetic flux density / B T (Tesla) 1T=1Vs/m2=10kGs
N33SH 12.1 ≥10.7 ≥20 35 ≤150
N42UH 13.5 ≥12.1 ≥25 44 ≤180 Magnetic polarization intensity / J T (Tesla) 1T=1Vs/m2=10kGs
N40UH 13.2 ≥11.8 ≥25 42 ≤180
N38UH 12.9 ≥11.5 ≥25 40 ≤180 Magnetic field intensity / H KA/m 1KA/m=4ЛOe≈12.57Oe
N35UH 12.4 ≥11.0 ≥25 37 ≤180
N33UH 12.1 ≥10.7 ≥25 35 ≤180 Magnetic energy product / BH KJ/m3 1KA/m3=0.126MGOe
N30UH 11.6 ≥10.2 ≥25 32 ≤180
N38EH 12.9 ≥11.5 ≥30 40 ≤200 Magnetic flux / Ф Wb (Weber) 1Wb=1Vs=108Mx
N35EH 12.4 ≥11.0 ≥30 37 ≤200
N33EH 12.1 ≥10.7 ≥30 35 ≤200
N30EH 11.5 ≥10.2 ≥30 32 ≤200
N33AH 12.1 ≥10.7 ≥35 35 ≤230
N30AH 11.5 ≥10.2 ≥35 32 ≤230
N28AH 11.2 ≥9.70 ≥35 30 ≤230
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