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MACMILL Magnets Co.,Ltd.

Sintered NdFeB magnet is mainly made of Neodymium、Iron and Boron,with excellent magnetic property、abundant raw material and reasonable prices.   NdFeB Magnet can be used as an ideal magnet in mini-motor、Permanent magnetic resonance、sound device, magnetic suspension system, magnetic transmission machine and iatrical apparatus and etc.  
For NdFeB, its surface is usually treated with some special methods. The surface treatment method include Zinc、Nickel、Tin、Silver、Gold plating、Phosphor and Spray Epoxy Resin etc.

Physical Properties:

Temp.Coeff of Br: -0.11%℃ Temp.Coeff of iHc: -0.60%℃ Density: 7.3-7.5g/cm3
Electrical Resistivity:144µQ/cm Vickers Hardness: 600Hv Flexural Strength: 25kg/mm2
Tensile Strength: 8.0kg/mm2 Coeff of Thermal Expansion: 4*10-6/℃ Specific Heat:0.12kCal/(kg.℃)
Poisson’s Ratio: 0.24 Compressibility:
9.8x10-12m2/N
Curie Temperature:310℃-340
Thermal Conductivity: 7.7kCal(m.h. ℃) Yong’s Modulus 1.6x1011N/m2 Rigidity 0.64N/ m2

Magnetic Characteristic:

Material Code Remanence Coercivity force Intrinsic coercivity force Maximum energy product Maximum operating temperature
NdFeB

 
Br bHC iHc (BH)max TW
 
KGs KOe Koe MGOe  
N-30 10.8-11.5 9.8-10.5 ≥12 28-31 80
N-33 11.3-11.7 10.0-11.1 ≥12 31-33 80
N-35 11.7-12.3 10.7-12.0 ≥12 33-36 80
N-38 12.1-12.7 11.1-12.4 ≥12 36-39 80
N-40 12.5-13.1 11.5-12.8 ≥12 38-41 80
N-42 12.9-13.5 11.5-13.2 ≥12 40-43 80
N-43 13.0-13.3 10.5-11.0 ≥12 41-43 80
N-45 13.3-13.9 11.5-13.6 ≥12 43-46 80
N-48 13.7-14.3 11.5-14.0 ≥12 46-49 80
N-33M 11.3-11.9 10.3-11.6 ≥14 31-33 80
N-35M 11.7-12.3 10.7-12 ≥14 33-36 80
N-38M 12.1-13.1 11.1-12.4 ≥14 36-39 80
N-40M 12.5-13.2 11.5-12.8 ≥14 38-41 80
N-42M 12.9-13.5 11.9-13.2 ≥14 40-43 80
N-45M 13.3-13.9 12.3-13.6 ≥14 43-46 80
N-27H 10.2-11.0 9.6-10.5 ≥17 25-28 100
N-30H 10.9-11.5 9.9-11.2 ≥17 28-31 100
N-33H 11.3-11.9 10.3-11.6 ≥17 31-34 100
N-35H 12.1-12.3 10.7-12.0 ≥17 33-36 100
N-40H 12.5-13.1 11.5-12.8 ≥17 38-41 100
N-42H 12.9-13.5 11.9-13.2 ≥17 40-43 100
N-27SH 10.5-11.1 9.5-10.8 ≥20 25-28 150
N-30SH 10.9-11.5 9.9-11.2 ≥20 28-31 150
N-33SH 11.3-11.9 10.3-11.6 ≥20 31-34 150
N-35SH 11.7-12.3 10.7-12.0 ≥20 33-36 150
N-38SH 12.1-12.7 11.1-12.4 ≥20 36-39 150
N-40SH 12.5-13.1 11.5-12.8 ≥20 38-41 150
N-25UH 10.1-10.7 9.1-10.4 ≥24 23-26 180
N-27UH 10.5-11.1 9.5-10.8 ≥24 25-28 180
N-30UH 10.9-11.5 9.9-11.2 ≥24 28-31 180
N-33UH 11.3-11.9 10.3-11.6 ≥24 31-34 180
N-35UH 11.7-12.3 10.7-12.0 ≥24 33-36 180

Production Process:
Raw materials-->Burden-->Melting under vacuum-->Crushing-->Milling-->Pressing in Magnetic Field-->Sintering & Tempering-->Machining ( Cutting, Drilling & etc.)-->Coating-->Inspection-->Packing

Types of Plating:
NdFeB usually need plating due to it is easy to rust, we treat NdFeB with Zinc coating (blue passivated or yellow passivated), Nickel coating, Nickel+Nickel coating, Nickel+Tin coating, Nickel+Copper+Nickel coating, Nickel+Epoxy coating & Epoxy coating. With these special treatment, NdFeB permanent magnets is not suitable to be installed into system without further treatment. To protect uncoated magnets temporarily, eg., damp transport or storage, passivation can be made against temporary environmental influences, such as a rise in humidity.


Dimension Range: At present,the dimension ranges for NdFeB sintered that we can meet as follow:

The largest size:
Disk: dia125x50mm
Ring:dia125x115x50mm
Block:150x100x50mm
The smallest size:
Disk: dia1.2x0.5mm
Ring:dia3.8x1.2x0.5mm
Block:1.5x1.5x0.5mm

Notes:
We are researching and developing more high grade NdFeB sintered continuingly, please feel free to contact us for any question.
Magnets can be machined as per customers' requirements, you only need offer us your drawings or your application, we can design according to your requirements


Bonded NdFeB is produced by composition of rare-earth NdFeB magnetic powders embedded in thermoplastic and formed by injection moulding machining. It is hard, Non-brittle light weight, plastic-like magnet, able to be moulded to varieties of shapes e.g. thin ring, gears, arc-segments etc.

Magnetic Characteristics and Physical Properties of Bonded Nd-Fe-B

Parameters/Specifications
JN-6
JN-7
JN-8
JN-9
JN-10
JN-11
JN-12
Residual Magnetic Induction (Br) (mT)
500~590
5.0~5.9
590~630
5.9~6.3
630~650
6.3~6.5
650~700
6.5~7.0
700~740
7.0~7.4
740~810
7.4~8.1
810~860
8.1~8.6
Coercive force
(Hcb)(kA/m)
320~400
4.0~5.0
400~424
5.0~5.3
424~440
5.3~5.5
440~464
5.5~5.8
440~464
5.5~5.8
424~480
5.3~6.0
424~480
5.3~6.0
Intrinsic coercive
force (Hci) (kA/m)
560~720
7.0~9.0
720~880
9.0~11.0
720~880
9.0~11.0
640~840
8.0~10.5
760~840
9.5~10.5
720~920
9.0~11.5
720~920
9.0~11.5
Maximum energy product(BH)
max (kJ/m3)
44~56
5.5~7.0
56~64
7.0~8.0
64~72
8.0~9.0
72~80
9.0~10.0
80~88
10.0~11.0
88~96
11.0~12.0
96~104
12.0~13.0
Average reversible temperature coefficient (αBr) (%/℃)
-0.10~-0.09
-0.10~-0.09
-0.10
-0.10
-0.10
-0.10
-0.10
Recoil permeability (μr)(μH/m)
1.20
1.20
1.20
1.20
1.20
1.20
1.20
Maximum operating temperature
(Tw) (℃)
150
150
150
150
130
130
140
Density ρ (g/cm3)
5.3~5.8
5.3~6.0
5.7~6.0
5.8-6.1
5.9~6.2
6.0~6.3
6.0~6.3
Production Process:Mixing raw materials->Injection mould->Finishing surface treatment->Finalinspection->Final products

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