Fujian Xingyuan Magnetic Materials Co.,Ltd

Sintered NdFeB Magnet

Sintered Neodymium Iron Boron (NdFeB), the most powerful Rare Earth magnet available today, possesses high energranging from 8MGOe to 52MGOe and wonderful coercive force. As the third generation of Rare Earth permanent magnet, NdFeB products are quite a bit less expensive, and are mechanically stronger and less brittle than SmCo, also density of NdFeB products is about 13% smaller than SmCo products. Because NdFeB magnets are more prone to oxidation than any other magnet alloy, for most applications, coating or plating the magnets is recommended.


Super-Strength Rare Earth Magnet—Sintered NdFeB magnets, have the characteristics of:

   Extreme strong Br Resident induction.

   Excellent demagnetization resistance capability.

   Good Price relative to its high magnetic properties.

   Coating is needed for NdFeB.

Surface Treatment Method: Type InformationMetallic Zinc, Nickel, Nickel+Nickel, Copper+Nickel, Nickel+Copper+NickelGold, Organic Epoxy, Nickel+Epoxy coatingTemporary Surface: Passivation

Manufacturing Method:Sintered NdFeB Magnet —fine NdFeB powder is compacted in a die and then sintered, fusing the powder into a solid material. There are 2 forms of pressing: die pressing (which involves a hard die into which the powder is placed and then pressed), and isostatic pressing (involving a special "rubber" die into which powder is placed and then pressed with equal force in all directions on the powder). Die pressed parts are usually made smaller than isostatically pressed parts. Although the magnetic properties of isostatically pressed parts are higher, the uniformity of magnetic characteristics is usually lower than that of die pressed parts. Sintered parts normally need some finish machining in order to meet final tolerances.

Machining:Some machining operations may be performed on NdFeB materials using carbide tools, although surface finishes thus obtained may be less than optimal. In general, NdFeB magnets must be machined using diamond-grinding techniques. We are fully equipped to machine these materials to your blueprint specifications.

Magnetizing and Handling:Rare Earth materials are mechanically weak, and magnetically very strong. They must therefore be handled very carefully to avoid damage and injury to personnel handling the magnets.All NdFeB magnets require extremely high magnetizing fields and special consideration must be given to this when designing complex assemblies, if it is intended to magnetize after assembly.

Temperature Effects:Magnetic properties of NdFeB deteriorate rapidly above about 130°C, depending on the grade of material, and the permeance coefficient of the magnet in operation. The higher the permeance coefficient the magnet operates at, the higher the temperature it will withstand. High Hci NdFeB materials operating at a high permeance coefficient can operate to about 220°C.

Common Applications for Neodymium Iron Boron Magnets:Holding systems requiring very high holding forces, high field yoke magnets, high performance stepper, DC, servo, linear, and voice coil motors, magnetic bearings, magnetic couplings, loudspeakers, Halbach arrays, headphones, microphones, magnetic separation, instrumentation, switches, relays, magnetic resonance, sputtering, vacuum deposition, charged particle beam guidance, particle accelerators, Undulators, Wigglers, and others.

Shapes and Sizes Available:In addition to the stock shapes, sizes, and grades listed, others are available. Please inquire. Non-standard shapes and sizes can be fabricated to blueprint specifications from raw stock.

Magnetic and Physical Properties


Sintered NdFeB Magnetic Properties









TYPE
RemanenceBr
Coercive forcebHc
Intrinsic coercive forceiHc
Max. energy product(BH) max
Working MAGNETIC AND PHYSICAL CHARACTERISTICS (NdFeB) Temperature





KGs
T
KOe
KA/m
KOe
KA/m
MGOe
KJ/m3
°C
N-30
10.8-11.2
1.08-1.12
9.8-10.5
780-836
≥12
≥955
28-30
223-239
≤80
N-33
11.4-11.7
1.14-1.17
10.5-11.0
836-876
≥12
≥955
31-33
247-263
≤80
N-35
11.7-12.1
1.17-1.21
10.8-11.5
860-915
≥12
≥955
33-35
263-279
≤80
N-36
11.9-12.2
1.19-1.22
10.8-11.5
860-915
≥12
≥955
34-36
271-287
≤80
N-38
12.2-12.6
1.22-1.26
10.8-11.5
860-915
≥12
≥955
36-38
287-303
≤80
N-40
12.6-12.9
1.26-1.29
10.5-11.0
836-876
≥12
≥955
38-40
303-318
≤80
N-42
12.9-13.2
1.29-1.32
10.5-11.0
836-876
≥12
≥955
40-42
318-334
≤80
N-43
13.0-13.3
1.30-1.33
10.5-11.0
836-876
≥12
≥955
41-43
326-342
≤80
N-45
13.3-13.7
1.33-1.37
10.5-11.0
836-876
≥12
≥965
43-45
342-358
≤80
N-48
13.8-14.2
1.38-1.42
≥10.5
≥835
≥12
≥955
46-49
366-390
≤80
N-50
13.8-14.5
1.38-1.45
≥10.5
≥835
≥11
≥955
47-51
374-406
≤80
N-52
14.3-14.8
1.43-1.48
≥10.8
≥860
≥11
≥876
50-53
398-422
≤80
N-27M
10.2-10.6
1.02-1.06
9.6-10.1
764-804
≥15
≥1194
25-27
199-215
≤100
N-30M
10.8-11.2
1.08-1.12
10.1-10.6
804-844
≥15
≥1194
28-30
223-239
≤100
N-33M
11.4-11.7
1.14-1.17
10.5-11.0
844-884
≥15
≥1194
31-33
247-263
≤100
N-35M
11.7-12.1
1.17-1.21
10.8-11.5
860-915
≥15
≥1114
33-35
263-279
≤100
N-36M
11.9-12.2
1.19-1.22
11.1-11.6
884-923
≥15
≥1194
34-36
271-287
≤100
N-38M
12.2-12.6
1.22-1.26
10.8-11.5
860-915
≥14
≥1114
36-38
287-303
≤100
N-40M
12.6-12.9
1.26-1.29
10.8-11.5
860-915
≥14
≥1114
38-40
303-318
≤100
N-42M
12.9-13.2
1.29-1.32
10.8-11.4
860-907
≥14
≥1114
40-42
318-334
≤100
N-45M
13.3-13.7
1.33-1.37
10.8-11.4
860-907
≥17
≥1114
43-45
334-358
≤100
N-48M
13.6-14.0
1.36-1.40
≥11.8
≥939
≥14
≥1114
46-49
366-390
≤100
N-50M
14.0-14.5
1.40-1.45
≥13.0
≥1033
≥14
≥1114
48-51
382-406
≤100
N-27H
10.2-10.6
1.02-1.06
9.6-10.1
764-804
≥17
≥1353
25-27
199-215
≤120
N-30H
10.8-11.2
1.08-1.12
10.1-10.6
804-844
≥17
≥1353
28-30
223-239
≤120
N-33H
11.4-11.7
1.14-1.17
10.6-11.1
844-884
≥17
≥1353
31-33
247-263
≤120
N-35H
11.7-12.1
1.17-1.21
10.8-11.5
860-915
≥17
≥1353
33-35
263-279
≤120
N-36H
11.9-12.2
1.19-1.22
11.1-11.6
884-923
≥17
≥1353
34-36
271-287
≤120
N-38H
12.2-12.6
1.22-1.26
11.5-12.0
915-955
≥17
≥1353
36-38
287-303
≤120
N-40H
12.6-12.9
1.26-1.29
11.5-12.0
915-955
≥17
≥1353
38-40
303-318
≤120
N-42H
12.9-13.2
1.29-1.32
11.5-12.0
915-955
≥17
≥1353
40-42
318-334
≤120
N-45H
13.2-13.8
1.32-1.38
≥12.0
955
≥17
≥1353
42-46
335-366
≤120
N-46H
13.3-13.8
1.33-1.38
≥12.2
972
≥16
≥1274
44-47
350-374
≤120
N-48H
13.6-14.3
1.36-1.43
≥12.5
995
≥16
≥1274
46-49
366-390
≤120
N-27SH
10.2-10.6
1.02-1.06
9.6-10.1
764-804
≥20
≥1592
25-27
199-215
≤150
N-30SH
10.8-11.2
1.08-1.12
10.1-10.6
804-844
≥20
≥1592
28-30
223-239
≤150
N-33SH
11.4-11.7
11.4-11.7
10.6-11.1
844-884
≥20
≥1592
31-33
247-263
≤150
N-35SH
11.7-12.1
1.17-1.21
10.8-11.5
860-915
≥20
≥1595
33-35
263-279
≤150
N-38SH
12.1-12.5
1.21-1.25
10.8-11.5
860-915
≥20
≥1592
36-38
287-302
≤150
N-40SH
12.6-12.9
1.26-1.29
10.8-11.5
860-915
≥20
≥1592
38-40
303-318
≤150
N-42SH
12.8-13.2
1.28-1.32
≥11.8
≥939
≥20
≥1672
40-43
320-343
≤150
N-45SH
13.2-13.8
1.32-1.38
≥12.6
≥1003
≥20
≥1592
43-46
342-366
≤150
N25UH
9.8-10.2
0.98-1.02
9.2-9.6
732-764
≥25
≥1990
23-25
183-199
≤180
N28UH
10.4-10.8
1.04-1.08
9.8-10.2
780-812
≥25
≥1990
26-28
207-223
≤180
N30UH
10.8-11.3
1.08-1.13
≥10.2
≥812
≥25
≥1990
28-31
223-247
≤180
N35UH
11.7-12.1
1.17-1.21
10.5-11.2
836-890
≥25
≥1989
33-35
263-278
≤180
N38UH
12.1-12.5
1.21-1.25
≥11.4
≥907
≥25
≥1990
36-39
287-310
≤180
N40UH
12.5-12.8
1.25-1.28
≥11.4
≥907
≥25
≥1990
38-41
302-326
≤180
N28EH
10.4-10.8
1.04-1.08
9.8-10.2
780-812
≥30
≥2387
26-28
207-223
≤200
N30EH
10.8-11.2
1.08-1.12
10.1-10.6
804-844
≥30
≥2387
28-30
223-239
≤200
N35EH
11.7-12.1
1.17-1.21
≥10.2
≥812
≥30
≥2388
33-36
263-287
≤200
N38EH
12.1-12.5
1.21-1.25
≥11.4
≥907
≥30
≥2388
36-39
287-310
≤200
N30AH
10.8-11.3
1.08-1.13
≥10.2
≥812
≥35
≥2785
28-32
223-255
≤220
N33AH
11.2-11.7
1.12-1.17
≥10.2
≥812
≥35
≥2785
31-34
247-271
≤220


Remark: The above mentioned data of magnetic and physical characteristics are given at room temperature

** The open flux irreversible loss of the testing sample at this temperature ≤5%


Other Physical Properties (Sintered NdFeB)



Temp.Coeff.of Br:
-0.11%/°C
Temp.Coeff.of iHc:
-0.60%/°C
Density:
7.4~7.6g/cm3
Electrical Resistivity:
144µΩcm
Vickers Hardness:
600HV
Flexural Strength:
25kg/mm
Tensile Strength:
8kg/mm2
Coef. of Thermal Expansion:
4×10-6/°C
Specific Heat:
0.12kcal/(kg.°C)
Thermal conductivity:
7.7kcal/m.h.°C
Young's Modulus:
1.6×1011N/m2
Rigidity:
0.64N/m2
Poisson's Ratio:
0.24
Compressibility:
9.8x10-12m2/N
Curie Temperature:
310~340°C