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At present time, Sintered NdFeB is one of the strongest magnet materials available. It contributes to the development of many small and flat motors used in the high-tech industry. It’s high residual induction (Br), high intrinsic Coercive force (Hcj) and high Energy Product (BH), makes it suitable for servo motors, disk brushless motors, stepping motors, IT industry, MRI, and audio products. For NdFeB,its surface is usually treatd with some special methods.The surface treatment method include Zine,Nickel,Tin,Silver,Gold plating,Phosphor and Spray Epoxy Resin etc.
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| Magnetic Properties of Sintered NdFeB Magnets |
|
Grade
|
Remanence
|
Coercivity Force
|
Intrinsic Coercive Force
|
Max. Energy Product
|
maximum Operating Temp.
|
|
Br
|
Hcb
|
Hcj
|
（ BH ） max
|
|
mT
|
kGs
|
kA/m
|
kOe
|
kA/m
|
kOe
|
kJ/m3
|
MGOe
|
|
N27
|
1030-1080
|
10.3-10.8
|
≥796
|
≥10.0
|
≥955
|
≥12
|
199-231
|
25-29
|
80 ℃
|
|
N30
|
1080-1130
|
10.8-11.3
|
≥796
|
≥10.0
|
≥955
|
≥12
|
223-247
|
28-31
|
80 ℃
|
|
N33
|
1130-1170
|
11.3-11.7
|
≥836
|
≥10.5
|
≥955
|
≥12
|
247-271
|
31-34
|
80 ℃
|
|
N35
|
1170-1220
|
11.7-12.2
|
≥868
|
≥10.9
|
≥955
|
≥12
|
263-287
|
33-36
|
80 ℃
|
|
N38
|
1220-1250
|
12.2-12.5
|
≥899
|
≥11.3
|
≥955
|
≥12
|
287-310
|
36-39
|
80 ℃
|
|
N40
|
1250-1280
|
12.5-12.8
|
≥907
|
≥11.4
|
≥955
|
≥12
|
302-326
|
38-41
|
80 ℃
|
|
N42
|
1280-1320
|
12.8-13.2
|
≥915
|
≥11.5
|
≥955
|
≥12
|
318-342
|
40-43
|
80 ℃
|
|
N45
|
1320-1380
|
13.2-13.8
|
≥923
|
≥11.6
|
≥955
|
≥12
|
342-366
|
43-46
|
80 ℃
|
|
N48
|
1380-1420
|
13.8-14.2
|
≥923
|
≥11.6
|
≥876
|
≥12
|
366-390
|
46-49
|
80 ℃
|
|
N50
|
1400-1450
|
14.0-14.5
|
≥796
|
≥10.0
|
≥876
|
≥11
|
382-406
|
48-51
|
60 ℃
|
|
N52
|
1430-1480
|
14.3-14.8
|
≥796
|
≥10.0
|
≥876
|
≥11
|
398-422
|
50-53
|
60 ℃
|
|
30M
|
1080-1130
|
10.8-11.3
|
≥796
|
≥10.0
|
≥1114
|
≥14
|
223-247
|
28-31
|
100 ℃
|
|
33M
|
1130-1170
|
11.3-11.7
|
≥836
|
≥10.5
|
≥1114
|
≥14
|
247-263
|
31-33
|
100 ℃
|
|
35M
|
1170-1220
|
11.7-12.2
|
≥868
|
≥10.9
|
≥1114
|
≥14
|
263-287
|
33-36
|
100 ℃
|
|
38M
|
1220-1250
|
12.2-12.5
|
≥899
|
≥11.3
|
≥1114
|
≥14
|
287-310
|
36-39
|
100 ℃
|
|
40M
|
1250-1280
|
12.5-12.8
|
≥923
|
≥11.6
|
≥1114
|
≥14
|
302-326
|
38-41
|
100 ℃
|
|
42M
|
1280-1320
|
12.8-13.2
|
≥955
|
≥12.0
|
≥1114
|
≥14
|
318-342
|
40-43
|
100 ℃
|
|
45M
|
1320-1380
|
13.2-13.8
|
≥995
|
≥12.5
|
≥1114
|
≥14
|
342-366
|
43-46
|
100 ℃
|
|
48M
|
1360-1430
|
13.6-14.3
|
≥1027
|
≥12.9
|
≥1114
|
≥14
|
366-390
|
46-49
|
100 ℃
|
|
50M
|
1400-1450
|
14.0-14.5
|
≥1033
|
≥13.0
|
≥1114
|
≥14
|
382-406
|
48-51
|
100 ℃
|
|
30H
|
1080-1130
|
10.8-11.3
|
≥796
|
≥10.0
|
≥1353
|
≥17
|
223-247
|
28-31
|
120 ℃
|
|
33H
|
1130-1170
|
11.3-11.7
|
≥836
|
≥10.5
|
≥1353
|
≥17
|
247-271
|
31-34
|
120 ℃
|
|
35H
|
1170-1220
|
11.7-12.2
|
≥868
|
≥10.9
|
≥1353
|
≥17
|
263-287
|
33-36
|
120 ℃
|
|
38H
|
1220-1250
|
12.2-12.5
|
≥899
|
≥11.3
|
≥1353
|
≥17
|
287-310
|
36-39
|
120 ℃
|
|
40H
|
1250-1280
|
12.5-12.8
|
≥923
|
≥11.6
|
≥1353
|
≥17
|
302-326
|
38-41
|
120 ℃
|
|
42H
|
1280-1320
|
12.8-13.2
|
≥955
|
≥12.0
|
≥1353
|
≥17
|
318-342
|
40-43
|
120 ℃
|
|
45H
|
1300-1360
|
13-13.6
|
≥963
|
≥12.1
|
≥1353
|
≥17
|
326-358
|
43-46
|
120 ℃
|
|
48H
|
1370-1430
|
13.7-14.3
|
≥995
|
≥12.5
|
≥1353
|
≥17
|
366-390
|
46-49
|
120 ℃
|
|
30SH
|
1080-1130
|
10.8-11.3
|
≥804
|
≥10.1
|
≥1592
|
≥20
|
223-247
|
28-31
|
150 ℃
|
|
33SH
|
1130-1170
|
11.3-11.7
|
≥844
|
≥10.6
|
≥1592
|
≥20
|
247-271
|
31-34
|
150 ℃
|
|
35SH
|
1170-1220
|
11.7-12.2
|
≥876
|
≥11.0
|
≥1592
|
≥20
|
263-287
|
33-36
|
150 ℃
|
|
38SH
|
1220-1250
|
12.2-12.5
|
≥907
|
≥11.4
|
≥1592
|
≥20
|
287-310
|
36-39
|
150 ℃
|
|
40SH
|
1240-1280
|
12.5-12.8
|
≥939
|
≥11.8
|
≥1592
|
≥20
|
302-326
|
38-41
|
150 ℃
|
|
42SH
|
1280-1320
|
12.8-13.2
|
≥987
|
≥12.4
|
≥1592
|
≥20
|
318-342
|
40-43
|
150 ℃
|
|
45SH
|
1320-1380
|
13.2-13.8
|
≥1003
|
≥12.6
|
≥1592
|
≥20
|
342-366
|
43-46
|
150 ℃
|
|
28UH
|
1020-1080
|
10.2-10.8
|
≥764
|
≥9.6
|
≥1990
|
≥25
|
207-231
|
26-29
|
180 ℃
|
|
30UH
|
1080-1130
|
10.8-11.3
|
≥812
|
≥10.2
|
≥1990
|
≥25
|
223-247
|
28-31
|
180 ℃
|
|
33UH
|
1130-1170
|
11.3-11.7
|
≥852
|
≥10.7
|
≥1990
|
≥25
|
247-271
|
31-34
|
180 ℃
|
|
35UH
|
1180-1220
|
11.8-12.2
|
≥860
|
≥10.8
|
≥1990
|
≥25
|
263-287
|
33-36
|
180 ℃
|
|
38UH
|
1220-1250
|
12.2-12.5
|
≥876
|
≥11.0
|
≥1990
|
≥25
|
287-310
|
36-39
|
180 ℃
|
|
40UH
|
1240-1280
|
12.5-12.8
|
≥899
|
≥11.3
|
≥1990
|
≥25
|
302-326
|
38-41
|
180 ℃
|
|
28EH
|
1040-1090
|
10.4-10.9
|
≥780
|
≥9.8
|
≥2388
|
≥30
|
207-231
|
26-29
|
200 ℃
|
|
30EH
|
1080-1130
|
10.8-11.3
|
≥812
|
≥10.2
|
≥2388
|
≥30
|
223-247
|
28-31
|
200 ℃
|
|
33EH
|
1130-1170
|
11.3-11.7
|
≥836
|
≥10.5
|
≥2388
|
≥30
|
247-271
|
31-34
|
200 ℃
|
|
35EH
|
1170-1220
|
11.7-12.2
|
≥876
|
≥11.0
|
≥2388
|
≥30
|
263-287
|
33-36
|
200 ℃
|
|
38EH
|
1220-1250
|
12.2-12.5
|
≥899
|
≥11.3
|
≥2388
|
≥30
|
287-310
|
36-39
|
200 ℃
|
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| Physical Properties of Sintered NdFeB Magnets |
|
Temp.Coeff.of Br
|
-0.11%/ ℃
|
Temp.Coeff.of Hc
|
-0.60%/ ℃
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|
Density
|
7.3-7.5g/cm 3
|
Electrical Resistivity
|
114 μΩ ..cm
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|
Vickers Hardness
|
600Hv
|
Flexural Resistivity
|
25kg/mm
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Tensile Strength
|
8.0Kg/mm2
|
Coeff. Of Thermal Expansion
|
4X10 -6 / ℃
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|
Specific Heat
|
0.12Kcal/Kg
|
Thermal Conductivity
|
7.7kcal/[m.h. ℃ ]
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|
Young’s Modulus
|
1.6X10[11]N/m2
|
Rigidity
|
0.64N/m2
|
|
Poisson’s Ratio
|
0.24
|
Compressibility
|
9.8x10-12m2/N
|
|
Curie Temperature
|
310-340 ℃
|
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| Process of Sintered NdFeB Magnets |
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