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Address5 Floor No 6Xinzhuang industrial Zone, Gaoqiao, Haishu, Ningbo, China
Tel(86)-574-26933988
Fax(86)-574-87934671
Emailsales@ndfebmagneti.com
Emailinfo@ndfebmagneti.com
Post Code315174
 
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NdFeB Magnet
NdFeB Magnetthe third generation of the rare earth magnetic material, is on of the best cost performance permanent magnetic materials with high coercive and excellent Br and Bh(max), which is made of Nd,Fe,B,Dy,Co and other minor elements. Because of good mechanical properties, it can be easily shaped into different sizes, therefore, it is widely used in motors, wind energy, Audio products, telecommunication, meters, magnetic resonance product, magnetic levitation product, VCM, MRI, etc.
Manufacturing Process
Neodymium, Iron, Boron and a few transition metals will be made into the NdFeB powder, then fine NdFeB powder will be compacted in a die and sintered, fusing the powder into a solid material. There are 2 forms of pressing: die pressing and isocratic pressing. Sintered parts normally need some finish machining in order to meet final tolerances.
Machining & Tolerance
Generally, NdFeB magnets must be machined using diamond-grinding techniques. Sometimes, machining operations may be performed on NdFeB materials using carbide tools, but surface finishes thus obtained may be less than optimal. The Standard tolerances for NdFeB magnets are +/- 0.1mm for ground dimensions, but sticter tolerances are possible if specially required.
Magnetizing & Packing
NdFeB magnets require extremely high magnetizing fields, and can be magnetized in any direction as long as it is aligned properly. In some instances multiple pole magnetization is possible with special fixtures.All NdFeB magnets are anisotropic, and can only be magnetized in the orientation direction, so particular consideration must be given to this when designing complex assemblies, if it is intended to magnetize after assembly.NdFeB magnets are mechanically weak, and magnetically very strong. They should be packed properly in order to help user to use and handle them.
Type
Remanence Br
Coercive Force Hcb
Intrinsic Coercive force Hci
Max Energy Product
(BH) max
Working Temp
No
Material
KG
T
KOe
KA/m
KOe
KA/m
MGOe
KJ/m
1
N-33
11.4-11.8
1.14-1.18
10.5
836
12
955
31-33
247-263
80
2
N-35
11.4-11.8
1.18-1.28
10.8
836
12
955
33-36
263-287
80
3
N-38
11.8-12.3
1.18-1.28
10.8
860
12
955
36-39
287-310
80
4
N-40
12.7-12.9
1.27-1.29
11.0
876
12
955
38-41
303-326
80
5
N-42
12.9-13.3
1.29-1.33
10.5
836
12
955
40-43
318-342
80
6
N-45
13.3-13.8
1.33-1.38
9.5
756
12
955
43-46
342-366
80
7
N48
13.7-14.2
1.37-1.42
10.5-13
836-1035
11
875
46-49
366-390
80
8
N50
13.9-14.5
1.39-1.45
10.5-13
836-1035
11
875
47-51
374-406
60
9
N52
14.2-14.7
1.42-1.47
10.5-13
836-1035
11
875
48-53
406-430
60
10
N-30M
10.8-11.4
1.08-1.14
9.8
780
14
1114
28-31
223-247
100
11
N-33M
11.4-11.8
1.14-1.18
10.3
820
14
1114
31-33
247-263
100
12
N-35M
11.8-12.3
1.18-1.23
10.8
860
14
1114
33-36
263-287
100
13
N-38M
12.3-12.7
1.23-1.27
11.0
876
14
1114
38-41
303-326
100
14
N-40M
12.7-12.9
1.27-1.29
11.4
907
14
1114
38-41
303-326
100
15
N42M
12.8-13.4
1.28-1.34
10.8-11.4
859-907
14
1114
40-43
319-343
100
16
N45M
13.3-13.8
1.33-1.38
12.4-13.4
987-1066
14
1114
43-46
343-366
100
17
N48M
13.7-14.2
1.37-1.42
12.8-13.8
1020-1098
14
1114
46-49
366-390
100
18
N-30H
10.8-11.4
1.08-1.14
10.2
812
17
1353
28-31
223-247
120
19
N-33H
11.4-11.8
1.14-1.18
10.6
844
17
1353
31-33
247-263
120
20
N-35H
11.8-12.3
1.18-1.28
11.0
876
17
1353
33-36
263-287
120
21
N-38H
12.3-12.7
1.23-1.27
11.2
890
17
1353
36-39
287-310
120
22
N-40H
12.7-12.9
1.27-1.29
11.5
915
17
1353
38-41
303-326
120
23
N-42H
12.8-13.4
1.28-1.34
12
955
17
1353
40-43
318-342
120
24
N-45H
13.3-13.8
1.33-1.38
12.4
986
17
1353
43-46
342-366
120
25
N-48H
13.6-14.2
1.36-1.42
12.8
1018
16
1273
45-49
358-390
120
26
N-30SH
10.8-11.4
1.081.14
10.0
796
21
1672
28-31
223-247
150
27
N-33SH
11.4-11.8
1.14-1.18
10.5
836
21
1672
31-34
247-276
150
28
N-35SH
11.8-12.3
1.18-1.23
11.0
876
21
1672
33-36
263-278
150
29
N-38SH
12.3-12.7
1.23-1.27
11.4
907
21
1672
36-39
278-310
150
30
N-42SH
12.8-13.4
1.28-1.34
12
955
20
1592
39-42
310-334
150
31
N-28UH
10.5-10.8
1.05-1.08
9.5
756
21
1672
26-29
207-231
180
32
N-30UH
10.8-11.4
1.08-1.14
9.5
756
25
1990
28-31
223-247
180
33
N-33UH
11.4-12.1
1.14-1.21
10.1
804
25
1990
31-34
247-271
180
34
N-35UH
11.7-12.4
1.17-1.24
10.5
836
25
1990
33-36
263-287
180
35
N-38UH
12.2-12.9
1.22-1.29
11
875
25
1990
36-39
287-310
180
36
N-40UH
12.5-13.3
1.25-1.33
11.3
899
25
1990
38-41
302-326
180
37
N-28EH
10.5-10.8
1.05-1.08
9.5
756
25
2388
26-29
207-231
200
38
N-30EH
10.8-11.4
1.08-1.14
9.5
756
30
2388
28-31
223-241
200
39
N-33EH
11.4-12.1
1.14-1.21
10.7
852
30
2388
31-35
247-379
200
40
N-35EH
11.7-12.4
1.17-1.24
10.9
868
30
2388
33-37
263-295
200
41
N-38EH
12.2-12.9
1.22-1.29
11.5
915
30
2388
36-40
287-318
20
Thermal Conductivity
7.7 kcal/m-h-C7.7 kcal/m-h-C
Youngs ModulusYoungs Modulus
1.7 x 104 kg/mm21.7 x 104 kg/mm2
Bending StrengthBending Strength
24 kg/mm2
Compressive Strengthv
80 kg/mm2
Electrical Resistivity
160 -ohm-cm/cm2
Density
7.4-7.5 g/cm3
Vickers Hardness
500 - 600
Available coatings for Sintered NdFeB magnet:  

Available Coatings:

Surface
Coating
Thickness (Microns)
Color
Resistance
Passivation
1
Silver Grey
Temporary Protection
Nickel
Ni+Ni
10-20
Bright Silver
Excellent against Humidity
Ni+Cu+Ni
Zinc
Zn
8-20
Bright Blue
Good Against Salt Spray
C-Zn
Shinny Color
Excellent Against Salt Spray
Tin
Ni+Cu+Sn
15-20
Silver
Superior Against Humidity
Gold
Ni+Cu+Au
10-20
Gold
Superior Against Humidity
Copper
Ni+Cu
10-20
Gold
Temporary Protection
Epoxy
Epoxy
15-25
Black, Red, Grey
Excellent Against Humidity
& Salt Spray
Ni+Cu+Epoxy
Zn+Epoxy
Chemical
Ni
10-20
Silver Grey
Excellent Against Humidity
Parylene
Parylene
5-20
Grey
Excellent Against Humidity, Salt Spray. Superior Against Solvents, Gases, Fungi and Bacteria.
FDA Approved.

Dimension Range / Nominal Tolerance

Ring Magnet

Outer Diameter (mm)

Inner Diameter (mm)

Thickness (mm)

Maximum

220

80

50

Minimum

2.6

1.8

0.5

Tolerance

0.1

0.1

0.1

 

Block Magnet

Length (mm)

Width (mm)

Thickness (mm)

Maximum

250

180

50

Minimum

2.0

1.5

0.5

Tolerance

0.1

0.1

0.1

 

Disc Magnet

Diameter (mm)

Thickness (mm)

Maximum

220

50

Minimum

1.2

0.5

Tolerance

0.1

0.1

Segment & other irregular shapes can be manfactured according to customer's sample or drawing
Demagnetization curves of sintered magnet at different temperatures
Magnetization Directions of Permanent Magnets
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Copyright@ Ningbo Alvin Magnets Material Co,.Ltd. Address:5 Floor No 6Xinzhuang industrial Zone,Gaoqiao,Haishu,Ningbo, China
Tel(86)-574-26933988Fax(86)-574-87934671Email:sales@ndfebmagneti.com Emailinfo@ndfebmagneti.com