Sintered NdFeB

Known as the third Generation of Rare Earth Magnets, Neodymium-Iron-Boron(NdFeB) magnets are the most powerful and advanced commercialized permanent magnets today. NdFeB magnets are introduced in 1980. This material offers the highest Energy Product (BH)max commercially available. Today their typical applications include high performance sensors, various DC motors, linear actuators, MRI, wind energy turbines etc. The highest (BH)max reaches up to 51MGOe. The choice of strip casting and HDDR technology in our factory allow us to make high performance NdFeB over N52 possible. The intrinsic coercive force is over 30000 Oe. Also, magnets are protected with effective surface treatment to prevent corrosion.

Why Choose Sintered NdFeB Magnet?

*Chemical Composition: Nd2Fe14B

Neodymium magnets are hard, brittle and easily corrode.

*Moderate Temperature Stability

Neodymium magnets lose -0.09~-0.13% of Br/℃. Their working stability is under 80℃ for low Hcj Neodymium magnets and above 200℃ for high Hcj Neodymium magnets.

*Excellent Strength Value

The highest (BH) max reaches up to 51MGOe.

*Advanced Technology

The choice of Strip casting and HDDR technology in our factory allows us to make high performance NdFeB over N52 possible.

*Extremely Resistance to Demagnetization with Hci

The intrinsic coercive force is over 30,000 Oe.

*Effective Surface Treatment to Prevent Corrosion

Surface treatments have been developed that allow them to be used in most applications. The treatments include gold, nickel, zinc and tin plating and epoxy resin coating.

Magnetic Properties

MAGNETIC CHARACTERISTICS AND PHYSICAL PROPERTIES OF SINTERED Nd-Fe-B

PROPERTIES GRADE	BrmT (KGs)	Hcb KA/m (Koe)	Hcj KA/m (KOe)	(BH)max KJ/m³ (MGOe)	TW ℃
PROPERTIES GRADE	BrmT (KGs)	Hcb KA/m (Koe)	Hcj KA/m (KOe)	(BH)max KJ/m³ (MGOe)	TW ℃
N35	1180-1220 (11.8-12.2)	≥860 (≥10.8)	≥955 (≥12)	263-287 (33-36)	≤80
N38	1230-1250 (12.3-12.5)	≥860 (≥10.8)	≥955 (≥12)	287-311 (36-39)	≤80
N40	1250-1280 (12.5-12.8)	≥860 (≥10.8)	≥955 (≥12)	303-326 (38-41)	≤80
N42	1280-1320 (12.8-13.2)	≥860 (≥10.8)	≥955 (≥12)	318-342 (40-43)	≤80
N45	1330-1370 (13.3-13.7)	≥860 (≥10.8)	≥955 (≥12)	342-366 (43-46)	≤80
N48	1370-1400 (13.7-14.0)	≥836 (≥10.5)	≥955 (≥12)	358-390 (45-49)	≤80
N50	1390-1430 (13.9-14.3)	≥836 (≥10.5)	≥955 (≥12)	374-406 (47-51)	≤60
N52	1420-1450 (14.2-14.5)	≥836 (≥10.5)	≥955 (≥12)	390-422 (49-53)	≤60
N54	1450-1500 (14.5-15.0)	≥836 (≥10.5)	≥955 (≥12)	406-438 (51-55)	≤60
N35M	1180-1220 (11.8-12.2)	≥860 (≥10.8)	≥1114 (≥14)	263-287 (33-36)	≤100
N38M	1230-1250 (12.3-12.5)	≥876 (≥11.0)	≥1114 (≥14)	287-311 (36-39)	≤100
N40M	1250-1280 (12.5-12.8)	≥908 (≥11.4)	≥1114 (≥14)	303-326 (38-41)	≤100
N42M	1280-1320 (12.8-13.2)	≥939 (≥11.8)	≥1114 (≥14)	318-342 (40-43)	≤100
N45M	1330-1370 (13.3-13.7)	≥971 (≥12.2)	≥1114 (≥14)	342-366 (43-46)	≤100
N48M	1370-1400 (13.7-14.0)	≥1011 (≥12.7)	≥1114 (≥14)	358-390 (45-49)	≤100
N50M	1390-1430 (13.9-14.3)	≥1035 (≥13.0)	≥1114 (≥14)	374-406 (47-51)	≤100
N52M	1420-1480 (14.2-14.8)	≥1059 (≥13.3)	≥1114 (≥14)	390-422 (49-53)	≤100
35H	1180-1220 (11.8-12.2)	≥876 (≥11.0)	≥1353 (≥17)	263-287 (33-36)	≤120
38H	1230-1250 (12.3-12.5)	≥908 (≥11.4)	≥1353 (≥17)	287-310 (36-39)	≤120
40H	1250-1280 (12.5-12.8)	≥932 (≥11.7)	≥1353 (≥17)	303-326 (38-41)	≤120
42H	1280-1320 (12.8-13.2)	≥955 (≥12.0)	≥1353 (≥17)	318-342 (40-43)	≤120
45H	1330-1370 (13.3-13.7)	≥995 (≥12.5)	≥1353 (≥17)	342-366 (43-46)	≤120
48H	1370-1400 (13.7-14.0)	≥1019 (≥12.8)	≥1353 (≥17)	358-390 (45-49)	≤120
50H	1400-1440 (14.0-14.4)	≥1051 (≥13.2)	≥1353 (≥17)	374-406 (47-51)	≤120
52H	1420-1460 (14.2-14.6)	≥1066 (≥13.4)	≥1353 (≥17)	382-422 (48-53)	≤120
33SH	1130-1180 (11.3-11.8)	≥836 (≥10.5)	≥1592 (≥20)	247-272 (31-34)	≤150
35SH	1180-1220 (11.8-12.2)	≥876 (≥11.0)	≥1592 (≥20)	263-287 (33-36)	≤150
38SH	1230-1250 (12.3-12.5)	≥884 (≥11.1)	≥1592 (≥20)	287-311 (36-39)	≤150
40SH	1250-1280 (12.5-12.8)	≥916 (≥11.5)	≥1592 (≥20)	302-326 (38-41)	≤150
42SH	1280-1320 (12.8-13.2)	≥939 (≥11.8)	≥1592 (≥20)	318-342 (40-43)	≤150
45SH	1330-1370 (13.3-13.7)	≥939 (≥11.8)	≥1592 (≥20)	342-366 (43-46)	≤150
30UH	1080-1130 (10.8-11.3)	≥756 (≥9.5)	≥1990 (≥25)	223-247 (28-31)	≤180
33UH	1130-1180 (11.3-11.8)	≥820 (≥10.3)	≥1990 (≥25)	247-271 (31-34)	≤180
35UH	1180-1220 (11.8-12.2)	≥844 (≥10.6)	≥1990 (≥25)	263-287 (33-36)	≤180
38UH	1230-1250 (12.3-12.5)	≥884 (≥11.1)	≥1990 (≥25)	287-311 (36-39)	≤180
40UH	1240-1280 (12.4-12.8)	≥912 (≥11.5)	≥1990 (≥25)	302-326 (38-41)	≤180
28EH	1040-1090 (10.4-10.9)	≥756 (≥9.5)	≥2389 (≥30)	207-231 (26-29)	≤200
30EH	1080-1130 (10.8-11.3)	≥756 (≥9.5)	≥2389 (≥30)	223-247 (28-31)	≤200
33EH	1130-1180 (11.3-11.8)	≥820 (≥10.3)	≥2389 (≥30)	247-271 (31-34)	≤200
35EH	1180-1220 (11.7-12.2)	≥844 (≥10.6)	≥2389 (≥30)	263-287 (33-36)	≤200
38EH	1220-1250 (12.2-12.5)	≥899 (≥11.3)	≥2388 (≥30)	287-310 (36-39)	≤200

REMARKS:

※ The above-mentioned data of magnetic parameters and physical properties are given at room temperature.

※ The maximum service temperature of magnet is changeable due to the ratio length and diameter and environmental factors.

※ Density: 7.4~7.6g/cm³; αBr: -0.09~-0.13%/℃; αHcj: -0.50~-0.80%/℃ ; Hardness: Hv 600 ;

Coating & Physical parameters

Coating and Corrosive Resistance of Sintered NdFeB

Surface

Coating

Colour

Thickness(μm)

Standard Resistance

Corrosive Resistance

PCT Test

Salt Spray Test

Nickel

Silver

10-20

48hr or 72hr

72hr

EXCELLENT

Ni+Cu+Ni

Zinc

Blue Zinc

Bright Blue

8-20

24hr

GOOD

Colour Zinc

Shinny Colour

Epoxy

Black / Grey

15-25

48hr

96hr

EXCELLENT

Ni+Cu+Epoxy

Tin

Ni+Cu+Sn

Silver

15-20

72hr

SUPERIOR

Parylene

Grey

15-25

96hr

200hr

SUPERIOR

Teflon

Grey

10-20

12hr

24hr

SUPERIOR

Phosphorization

/

Grey

1-2

-

TEMPORARY PROETCTION

Passivation

/

Grey

1-2

-

TEMPORARY PROETCTION

※ PCT test(120℃,100%RH,2.0atm);Salt Spray Test(5%NaCl,35℃ continue spray).

Item

Parameters

Reference Value

Additional
Magnetic
Properties

Temp.Coeff.of Br (α(Br))/(%/K)

-0.08 ～ -0.12

Temp.Coeff.of Hcj (β(Hcj))/(%/K)

-0.42 ～ -0.70

Curie Temperature (Tc)/K

310 ～ 380

Recoil Permeability (μrec)[-]

1.05

Mechanical
and Physical
Properties

Density (g/cm³)

7.6

Vickers Hardness (Hv)

650

Electrical Resistivity (μΩom)

1.4

Compressive Strength (Mpa)

1050

Tensile Strength (Mpa)

80

Bending Strength (Mpa)

290

Thermal Conductivity (W/(moK))

6 ～ 8

Young's Modulus (Gpa)

160

Coefficient of Thermal Expansive (C⊥) (10-6/K)

-1.5

Coefficient of Thermal Expansive (C‖) (10-6/K)

6.5

※ Technical specifications and parameters are subjected to change without notice.

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Sintered NdFeB