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Do you know the properties of neodymium magnet?

Publish Time: 2024-08-29     Origin: Site


Neodymium-iron-boron (NdFeB) magnets, also known as neodymium magnets, are a type of rare-earth magnet material with the following properties:

 

Neodymium Magnets

 

1. High magnetic strength: NdFeB magnets are the strongest known permanent magnets, and are capable of achieving very high levels of magnetic force, which is several times that of other types of magnets, such as ferrite magnets.

 

2. High remanence: Remanence refers to the magnetism that a magnet remains in a material after demagnetization. The remanence of NdFeB magnets is very high that they can maintain strong magnetic magnetism even after the external magnetic field disappears.

 

3. High coercivity: Coercivity refers to the ability to resist the effects of an external magnetic field. NdFeB magnets have high coercivity which enables them to maintain stable magnetic performance in high-temperature and high-current environments.

 

4. High energy density: The energy density refers to the amount of magnetic energy stored per unit volume. The energy density of NdFeB magnets is very high, which makes them particularly useful in miniaturized and lightweight applications.

 

5. Corrosion resistance: NdFeB magnets are usually coated (such as with zinc or nickel plating, etc) to improve their corrosion resistance and maintain good performance in various environments.

 

6. Temperature stability: NdFeB magnets maintain good magnetic properties within a certain temperature range (usually between -40℃ and 200℃, depending on the grade). However, their magnetism begins to weaken beyond a specific temperature after exceeding a certain temperature.

 

7. Diverse shapes and sizes: NdFeB magnets can be manufactured in various shapes and sizes as needed, including cylindrical, ring, square, irregular shapes and other customized shapes.

 

8. Wide applications: Due to their strong magnetic strength and other excellent characteristics, NdFeB magnets are widely used in many fields, including motors, generators, audio equipment, sensors, medical devices, magnetic separators, etc.

 

The following figure shows the physical properties of sintered neodymium magnets.


Temp.Coeff.of Br

-0.09 ～ -0.11%/℃

Density

7.4 ～ 7.7g/cm3

Vickers Hardness

570 Hv

Tensile Strength

780N/mm²

Specific Heat

0.12Kcal (Kg,℃)

Young's Modulus

1.6 x 10⊃1;⊃1;N/M⊃2;

Poison's Ratio

0.24

Curie Temperature

310℃ ～ 340℃

Temp.Coeff.of Hcj

-0.45 ～ -0.65%/℃

Eletrical Resistivity

1.5x10-4 Ω.cm

Flexural Strength

25kg/mm²

Coefficent of Thermal Expansion

4x10-6 ℃

Thermal conductivity

77KCal/(m.h℃)

Rigidity

0.64N/m²

Compressibility

9.8x10-12 m²/N

Relative recoil permeability

1.05


After understanding its physical characteristics, let's take a look at its performance grade parameter table.



Technical Data of Sintered NdFeB Magnet

Grade

Br

Hcb

Hcj

(BH)max

(Tw)

mT

(kGs)

kA/m

(kOe)

kA/m

(kOe)

kJ/m3

(MGOe)

N28

1030-1080

(10.3-10.8)

≥796

( ≥10.0)

≥955

( ≥12)

199-231

(25-29)

80 ºC

N35

1170-1220

(11.7-12.2)

≥868

( ≥10.9)

≥955

( ≥12)

263-287

(33-36)

80 ºC

N38

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥955

( ≥12)

287-310

(36-39)

80 ºC

N40

1250-1280

(12.5-12.8)

≥907

( ≥11.4)

≥955

( ≥12)

302-326

(38-41)

80 ºC

N42

1280-1320

(12.8-13.2)

≥915

( ≥11.5)

≥955

( ≥12)

318-342

(40-43)

80 ºC

N45

1320-1380

(13.2-13.8)

≥923

( ≥11.6)

≥955

( ≥12)

342-366

(43-46)

80 ºC

N48

1380-1420

(13.8-14.2)

≥923

( ≥11.6)

≥876

( ≥12)

366-390

(46-49)

80 ºC

N50

1400-1450

(14.0-14.5)

≥796

( ≥10.0)

≥876

( ≥11)

382-406

(48-51)

60 ºC

N52

1430-1480

(14.3-14.8)

≥796

( ≥10.0)

≥876

( ≥11)

398-422

(50-53)

60 ºC

30M

1080-1130

(10.8-11.3)

≥796

( ≥10.0)

≥1114

( ≥14)

223-247

(28-31)

100 ºC

33M

1130-1170

(11.3-11.7)

≥836

( ≥10.5)

≥1114

( ≥14)

247-263

(31-33)

100 ºC

35M

1170-1220

(11.7-12.2)

≥868

( ≥10.9)

≥1114

( ≥14)

263-287

(33-36)

100 ºC

38M

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥1114

( ≥14)

287-310

(36-39)

100 ºC

40M

1250-1280

(12.5-12.8)

≥923

( ≥11.6)

≥1114

( ≥14)

302-326

(38-41)

100 ºC

42M

1280-1320

(12.8-13.2)

≥955

( ≥12.0)

≥1114

( ≥14)

318-342

(40-43)

100 ºC

45M

1320-1380

(13.2-13.8)

≥995

( ≥12.5)

≥1114

( ≥14)

342-366

(43-46)

100 ºC

48M

1360-1430

(13.6-14.3)

≥1027

( ≥12.9)

≥1114

( ≥14)

366-390

(46-49)

100 ºC

50M

1400-1450

(14.0-14.5)

≥1033

( ≥13.0)

≥1114

( ≥14)

382-406

(48-51)

100 ºC

30H

1080-1130

(10.8-11.3)

≥796

( ≥10.0)

≥1353

( ≥17)

223-247

(28-31)

120 ºC

33H

1130-1170

(11.3-11.7)

≥836

( ≥10.5)

≥1353

( ≥17)

247-271

(31-34)

120 ºC

35H

1170-1220

(11.7-12.2)

≥868

( ≥10.9)

≥1353

( ≥17)

263-287

(33-36)

120 ºC

38H

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥1353

( ≥17)

287-310

(36-39)

120 ºC

40H

1250-1280

(12.5-12.8)

≥923

( ≥11.6)

≥1353

( ≥17)

302-326

(38-41)

120 ºC

42H

1280-1320

(12.8-13.2)

≥955

( ≥12.0)

≥1353

( ≥17)

318-342

(40-43)

120 ºC

45H

1300-1360

(13-13.6)

≥963

( ≥12.1)

≥1353

( ≥17)

326-358

(43-46)

120 ºC

48H

1370-1430

(13.7-14.3)

≥995

( ≥12.5)

≥1353

( ≥17)

366-390

(46-49)

120 ºC

50H

1400-1450

(14.0-14.5)

≥1033

( ≥13.0)

≥1274

( ≥16)

374-406

(47-51)

120 ºC

30SH

1080-1130

(10.8-11.3)

≥804

( ≥10.1)

≥1592

( ≥20)

223-247

(28-31)

150 ºC

33SH

1130-1170

(11.3-11.7)

≥844

( ≥10.6)

≥1592

( ≥20)

247-271

(31-34)

150 ºC

35SH

1170-1220

(11.7-12.2)

≥876

( ≥11.0)

≥1592

( ≥20)

263-287

(33-36)

150 ºC

38SH

1220-1250

(12.2-12.5)

≥907

( ≥11.4)

≥1592

( ≥20)

287-310

(36-39)

150 ºC

40SH

1240-1280

(12.5-12.8)

≥939

( ≥11.8)

≥1592

( ≥20)

302-326

(38-41)

150 ºC

42SH

1280-1320

(12.8-13.2)

≥987

( ≥12.4)

≥1592

( ≥20)

318-342

(40-43)

150 ºC

45SH

1320-1380

(13.2-13.8)

≥1003

( ≥12.6)

≥1592

( ≥20)

342-366

(43-46)

150 ºC

50SH

1400-1450

(14.0-14.5)

≥1033

( ≥13.0)

≥1512

( ≥19)

374-406

(47-51)

150 ºC

28UH

1020-1080

(10.2-10.8)

≥764

( ≥9.6)

≥1990

( ≥25)

207-231

(26-29)

180 ºC

30UH

1080-1130

(10.8-11.3)

≥812

( ≥10.2)

≥1990

( ≥25)

223-247

(28-31)

180 ºC

33UH

1130-1170

(11.3-11.7)

≥852

( ≥10.7)

≥1990

( ≥25)

247-271

(31-34)

180 ºC

35UH

1180-1220

(11.8-12.2)

≥860

( ≥10.8)

≥1990

( ≥25)

263-287

(33-36)

180 ºC

38UH

1220-1250

(12.2-12.5)

≥876

( ≥11.0)

≥1990

( ≥25)

287-310

(36-39)

180 ºC

40UH

1240-1280

(12.5-12.8)

≥899

( ≥11.3)

≥1990

( ≥25)

302-326

(38-41)

180 ºC

28EH

1040-1090

(10.4-10.9)

≥780

( ≥9.8)

≥2388

( ≥30)

207-231

(26-29)

200 ºC

30EH

1080-1130

(10.8-11.3)

≥812

( ≥10.2)

≥2388

( ≥30)

223-247

(28-31)

200 ºC

33EH

1130-1170

(11.3-11.7)

≥836

( ≥10.5)

≥2388

( ≥30)

247-271

(31-34)

200 ºC

35EH

1170-1220

(11.7-12.2)

≥876

( ≥11.0)

≥2388

( ≥30)

263-287

(33-36)

200 ºC

38EH

1220-1250

(12.2-12.5)

≥899

( ≥11.3)

≥2388

( ≥30)

287-310

(36-39)

200 ºC

28AH

1040-1090

(10.4-10.9)

≥787

( ≥9.9)

≥2624

( ≥33)

207-231

(26-29)

230 ºC

30AH

1080-1130

(10.8-11.3)

≥819

( ≥10.3)

≥2624

( ≥33)

223-247

(28-31)

230 ºC

33AH

1130-1170

(11.3-11.7)

≥843

( ≥10.6)

≥2624

( ≥33)

247-271

(31-34)

230 ºC


It's important to note that while NdFeB magnets offer many advantages, they are also susceptible to impact and stress, which can cause them to break or crack. Therefore, special care is required during using and handling.

 

If you want to know more details of neodymium magnets, neodymium magnet prices, you are welcome to contact with Ningbo Bestway Magnet.


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