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Sintered NdFeB magnets

Sintered NdFeB magnets

Sintered NdFeB magnets
CategoriesNdFeb Magnets
AlbumView larger image
BrandCINFER
MaterialNeodymium iron boron, Neo Magnet, Nd Magnet
ShapeMain Disc, but Block or Rectangular or Cuboid, Ring, Cylinder, Arc and Irregular shape are also available
CoatingNi, Ni-Cu-Ni, Electroless Nickel, Zinc, Colored Zinc, Epoxy
Magnetized directionAxially or Diametrical Magnetized, but Thickness, Multipoles and Radial magnetization are also available
CertificateISO/TS 16949, ISO9001, ISO14001, RoHS, REACH
PackingStandard sea or air packing, such as carton, wooden box, pallet etc.
Update Time2019-12-12
Detail Information

Sintered Neodymium Iron Boron (NdFeB) magnet

 

Sintered Neodymium Iron Boron (NdFeB), or “neo” magnets, is the third generation of permanent magnet developed in the 1980s. It offers the strongest magnetic power today. With its excellent magnetic characteristics Neodymium Magnet offers flexibility for new designs or is replacing older materials like Alnico and Ceramic in many applications, including high performance motors, brushless DC motors, magnetic separation, magnetic resonance imaging, sensors and loud speakers.

Why Choose Neodymium Magnet

A powder metallurgy process is used in producing sintered Neodymium magnets. Although sintered Neodymium magnet is mechanically stronger than Samarium Cobalt magnets and less brittle than other magnets, it should not be used as a structural component. Selection of Neodymium magnet is limited by temperature due to its irreversible loss and moderately high reversible temperature coefficient of Br and Hcj. The maximum application temperature is 200 °C for high coercivity grades. Neodymium magnet is more prone to oxidation than any other magnet alloys. If Neodymium magnet is to be exposed to humidity, chemically aggressive media such as acids, alkaline solutions salts and harmful gases, coating is recommended. It is not recommended in a hydrogen atmosphere.

Neodymium magnet has poor resistance to corrosion and they can also corrode from the inside-out if proper pre-treatment processes are not followed. Oftentimes, multi-layer Nickel-Copper-Nickel plating is applied to prevent failure from corrosion, but this preventative technique may not be sufficient for all applications.

Application of Neodymium Magnet

These neodymium magnets are widely used in motor, sensor, elevator, automotive, wind generator, speaker, military and aerospace industries etc.

High Temperature Stability Neodymium Magnet

With higher Hcj value, these neodymium magnet is more stable during high temperature. The tests show that the maximum permanent loss after aging is 5%.

                                         Magneticcharacteristics and physical properties of sintered NdFeB magne

Magnetic characteristics and physical properties of sintered NdFeB magnet

牌号

Grade

剩磁 Br

Residual Induction

磁感矫顽力

Coercive Force

内禀矫顽力

Intrinsic Coercive Force

最大磁能积 (BH)max

Max Energy Product

工作温度

Working Temperature

BrKGs(mT)

Hcb:Koe(KA/m)

Hcj:Koe(KA/m)

(BH)max:MGOe(KJ/m3)

(TW)

N35

11.8-12.2(1180-1220)

10.8(860)

12.0(955)

33-36(262-286)

80

N38

12.2-12.6(1220-1260)

10.8(860)

12.0(955)

36-39(286-310)

80

N40

12.6-12.9(1260-1290)

11.0(876)

12.0(955)

38-40(302-318)

80

N42

12.9-13.3(1290-1330)

11.0(876)

12.0(955)

40-43(318-343)

80

N45

13.3-13.7(1330-1370)

11.0(876)

12.0(955)

43-46(343-366)

80

N48

13.7-14.0(1370-1400)

10.8(860)

12.0(955)

46-49(366-390)

80

N50

14.0-14.4(1400-1440)

10.5(836)

12.0(955)

48-50(382-398)

80

N52

14.2-14.5(1420-1450)

10.5(836)

12.0(955)

50-52(398-413)

80

N35M

11.8-12.2(1180-1220)

10.8(860)

14.0(1114)

33-36(262-286)

100

N38M

12.2-12.6(1220-1260)

11.0(876)

14.0(1114)

36-39(286-310)

100

N40M

12.6-12.9(1260-1290)

11.4(910)

14.0(1114)

38-40(302-318)

100

N42M

12.9-13.3(1290-1330)

11.8(938)

14.0(1114)

40-43(318-343)

100

N45M

13.3-13.7(1330-1370)

11.8(938)

14.0(1114)

43-46(343-366)

100

N48M

13.7-14.0(1370-1400)

11.8(938)

14.0(1114)

46-49(366-390)

100

N50M

14.0-14.4(1400-1440)

11.5(915)

14.0(1114)

48-50(382-398)

100

N35H

11.8-12.2(1180-1220)

11.0(876)

17.0(1353)

33-36(262-286)

120

N38H

12.2-12.6(1220-1260)

11.0(876)

17.0(1353)

36-39(286-310)

120

N40H

12.6-12.9(1260-1290)

11.5(915)

17.0(1353)

38-40(302-318)

120

N42H

12.9-13.3(1290-1330)

11.8(938)

17.0(1353)

40-43(318-343)

120

N45H

13.3-13.7(1330-1370)

11.8(938)

17.0(1353)

43-46(343-366)

120

N48H

13.7-14.0(1370-1400)

12.2(938)

17.0(1353)

46-49(366-390)

120

N35SH

11.8-12.2(1180-1220)

11.0(876)

20.0(1593)

33-36(262-286)

150

N38SH

12.2-12.6(1220-1260)

11.0(876)

20.0(1593)

36-39(286-310)

150

N40SH

12.6-12.9(1260-1290)

11.5(915)

20.0(1593)

38-40(302-318)

150

N42SH

12.9-13.3(1290-1330)

11.8(938)

20.0(1593)

40-43(318-343)

150

N45SH

13.3-13.7(1330-1370)

11.8(938)

20.0(1593)

43-46(343-366)

150

N30UH

10.8-11.4(1080-1140)

10.1(804)

25.0(1990)

28-31(223-246)

180

N33UH

11.3-11.7(1130-1170)

10.3(820)

25.0(1990)

30-33(239-262)

180

N35UH

11.8-12.2(1180-1220)

11.0(876)

25.0(1990)

33-36(262-286)

180

N38UH

12.2-12.6(1220-1260)

11.2(892)

25.0(1990)

36-39(286-310)

180

N40UH

12.6-12.9(1260-1290)

11.5(915)

25.0(1990)

38-40(302-318)

180

N42UH

12.9-13.3(1290-1330)

11.8(938)

25.0(1990)

40-43(318-343)

180

N30EH

10.8-11.4(1080-1140)

10.1(804)

30.0(2388)

28-31(223-246)

200

N33EH

11.3-11.7(1130-1170)

10.3(820)

30.0(2388)

30-33(239-262)

200

N35EH

11.8-12.2(1180-1220)

11.0(876)

30.0(2388)

33-36(262-286)

200

N38EH

12.2-12.6(1220-1260)

11.2(892)

30.0(2388)

36-39(286-310)

200

N30AH

10.8-11.4(1080-1140)

10.1(804)

35.0(2785)

28-31(223-246)

220

N33AH

11.3-11.7(1130-1170)

10.3(820)

35.0(2785)

30-33(239-262)

220

N35AH

11.8-12.2(1180-1220)

11.0(876)

35.0(2785)

33-36(262-286)

220


Manufacturing process

Sintered Nd-magnets are manufactured by a powder metallurgical process. The raw materials, Fe, Nd, B etc.are melted in a furnace and then cast into thin sheet by strip casting. The material is pulverized firstly by hydrogen decrepitation and then by jet milling under protetctive atmosphere. The powder is then oriented with external magnetic field and pressed into blocks or near net shape. Final properties and density are achivied in following sintering and heat treatments. The blocks are then cut to shape, surface treated against corrosion and magnetized.


Physical properties

The typical physical properties of NdFeB are given in the table below.These values must not be understood as guaranteed, as the properties are not controlled in manufacture. NdFeB magnets are fragile and must never be used as load carrying elements in a design. Please note that the coefficient of thermal expansion is positive along the magnetizing axel and negative perpendicular to the magnetization.


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