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Do you know the properties of neodymium magnet?

Author: Site Editor 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 10¹¹N/M²
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.

properties of neodymium magnet

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