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Neodymium Magnet

General Descriptions of sintered NdFeB magnets

sintered NdFeB magnets The most powerful magnets available, Sintered NdFeB is produced by powder metallurgical process with chemical composition of Nd2Fe14B, which are hard, brittle and easily corrode, involving the sintering of compacts under vacuum. Poorest corrosion resistance of all commercial magnetic material. Grinding and slicing possible; very reactive with moisture and oxygen; coating may be applied depending on the expected environment. The sintered NdFeB magnet has high remanence, high coercive force, high-energy product and high ratio between performance value and product cost. It may be easily formed into various sizes. The intrinsic coercive force is over 30,000 Oe. Neodymium magnets lose -0.09 ~ -0.13% of Br/°C. Their working stability is under 80°C for low Hci. NeodSintered NdFeB Magnetsymium magnets and above 200°C for high Hci Neodymium magnets. The highest (BH)max reaches up to 51MGOe . The choice of Strip casting and HDDR technology in our factory allows us to make high performance NdFeB over N52 possible. Surface treatments have been developed that allow the sintered NdFeB magnet to be used in most applications. The treatments include gold, nickel, zinc and tin plating and epoxy resin coating.



Magnetic Properties of Sintered NdFeB Magnets

Properties
Remanence
Coercive force
Intrinsic coercive
Maximim energy prodouct
  
Working temperature
Br
BHc
Force iHc
(BH)max
Tw(L/D-0.7Cyinder)

Unit
kGs
T
kOe
KA/m
 　
kOe
　
　
KA/m
　
MGOe
KJ/m3
 　
　
℃
NO
Grade
Nom
Nom
Nom
Nom
Nom
Nom
1
N35
12.1
1.21
11.5
915
≥12
≥955
35
279
≤80
2
N38
12.6
1.26
11.5
915
≥12
≥955
38
303
≤80
3
N40
12.9
1.29
11
876
≥12
≥955
40
318
≤80
4
N42
13.2
1.32
11
876
≥12
≥955
42
342
≤80
5
N45
13.7
1.37
11
876
≥12
≥955
45
358
≤80
6
N48
14
1.4
11
876
≥12
≥955
48
374
≤80
7
N50
14.4
1.44
11
876
≥12
≥955
51
390
≤80
8
N52
14.6
1.46
11
876
≥12
≥955
52
420
≤80
9
N35M
12.1
1.21
11.5
915
≥14
≥1114
35
279
≤100
10
N38M
12.6
1.26
11.5
915
≥14
≥1114
38
303
≤100
11
N40M
12.9
1.29
11.5
915
≥14
≥114
40
318
≤100
12
N42M
13.2
1.32
11.5
915
≥14
≥114
42
342
≤100
13
N45M
13.7
1.37
11.5
915
≥14
≥114
45
358
≤100
14
N48M
14.3
1.43
11.5
915
≥14
≥1114
49
390
≤100
15
N35H
12.1
1.21
11.5
915
≥17
≥1353
35
279
≤120
16
N38H
12.6
1.26
12
955
≥17
≥1353
38
303
≤120
17
N40H
12.9
1.29
12
955
≥17
≥1353
40
318
≤120
18
N42H
13.2
1.32
12
955
≥17
≥1353
42
342
≤120
19
N44H
13.6
1.36
12
955
≥17
≥1353
44
358
≤120
20
N45H
13.7
1.37
11
876
≥17
≥1353
45
358
≤120
21
N48H
14.2
1.42
12
995
≥17
≥1353
48
380
≤120
22
N33SH
11.7
1.17
11
876
≥20
≥1595
33
263
≤150
23
N35SH
12.1
1.21
11.5
915
≥20
≥1595
35
279
≤150
24
N38SH
12.6
1.26
12
955
≥20
≥1595
38
302
≤150
25
N40SH
12.9
1.29
12
1011
≥20
≥1595
40
318
≤150
26
N42SH
13.2
1.32
12
1011
≥20
≥1595
42
342
≤150
27
N28UH
10.8
1.08
10.2
812
≥25
≥1990
28
223
≤180
28
N30UH
11.2
1.21
10.6
844
≥25
≥1990
30
239
≤180
29
N33UH
11.7
1.17
11
876
≥25
≥1990
33
263
≤180
30
N35UH
12.1
1.21
11.5
915
≥25
≥1990
35
279
≤180
31
N38UH
12.6
1.26
12
955
≥25
≥1990
38
302
≤180
32
N40UH
12.9
1.29
12.4
987
≥25
≥1990
40
319
≤180
33
N28EH
10.8
1.08
10.4
811
≥30
≥2229
28
223
≤200
34
N30EH
11.2
1.12
10.6
844
≥30
≥2229
30
239
≤200
35
N33EH
11.7
1.17
11
876
≥30
≥2229
33
263
≤200
36
N35EH
12.1
1.21
11.5
915
≥30
≥2229
35
279
≤200
37
N34AH
11.6
1.16
11.3
900
≥36
≥2547
34
271
≤240

 

Physical Characteristics of Sintered NdFeB Magnets

Characteristics
Unit
Specification
Curie Temp.
oC
310~340
Reversible Temp. Coefficient of Br 20~100
%/ oC
-0.100 ~ -0.126
Reversible Temp. Coefficient of Hcj 20~100
%/ oC
-0.50 ~ -0.65
Density
g/cm3
≥7.3
Vickers Hardness
  
600
Bending Strength
MPa
250
Tensile Strength
MPa
80
Compressive Strength
MPa
1050
Specific Resistance
μΩcm
150
Thermal Conductivity
W/(m. oC)
9
Thermal Expansion
10-6
5 (Parallel w. orientation direction)
-1.5 (vertical w. orientation direction)
Specific Heat
J/(kg. oC)
460

Features of Sintered NdFeB Magnet:

1. Moderate temperature stability; Extremely resistance to demagnetization.
2. Excellent strength value.
3. Advanced Technology.
4. Effective surface treatment to prevent corrosion.
5. High resistance to demagnetization; Excellent cost to performance ratio; Reasonable temperature stability; Not suitable for application which exposed in high temperature conditions.

Application of Sintered NdFeB:

Especially suitable for used in various electronic motors, engineering equipment, medical equipment, Health bandages and plasters, audio apparatus, Micro products of Auto, National defence, Security systems, Computer, Biology project, Instrument and Meter, household appliances, Magnetic separators, Magnetic resonance imaging, Specialty door catches, Filters & strainers, Sensors Speakers, Microphone/earphone, High performance motors, Brushless motor, Micromotor / servo motor, VCM(voice coil motor) Automobiles, Magnetic coupling Magnetic Chuck, Magnetic toy, Magnetic tools, Other magnetic applications.

 

 

 

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