|
High Performance NdFeB Professional Manufacturer in China
NdFeB Magnets - Neodymium Iron Boron magnets
Rare earth permanent magnet NdFeB (Neodymium-Iron-Boron) is a new kind of magnetic material developed in the 1980's with excellent magnetic characteristics (high energy product and high coercive force etc.) and relatively low cost. It is getting to replace the traditional magnets of hard ferrite, AlNiCo and SmCo in many fields such as electro-accoustic devices, electric motors, sensors/transducers, instruments and meters, auto industry, petro-chemical industry and magnetic health-care products etc.
NdFeB magnets are very powerful. They have a higher Maximum Energy Product, (BH)max, than SmCo magnets. (BH)max of NdFeB can easily reach 30 MGOe and even goes up to 52 MGOe. NdFeB magnets can replace SmCo magnets in most cases, especially where operating temperature is less than 80°C.
The temperature stability of NdFeB is not as good as SmCo magnets. Magnetic performance of NdFeB magnets will deteriorate rapidly above 200°C. Compared to SmCo magnets, the corrosion and oxidation resistance of NdFeB is relatively low. Therefore, A surface coating is usually applied on NdFeB magnets. Zinc or nickel coating is common used as a protective layer. Other materials such as gold, brass, tin or polymer (epoxy) are also used for this purpose.
|
Product Information |
- Produced by the powder metallurgical method with chemical composition of Nd2Fe14B
- Very brittle and hard
- Poorest corrosion resistance of all commercial magnetic material
- High resistance to magnetic demagnetization
- Excellent cost to performance ratio
- Reasonable temperature stability
- Not suitable for application which exposed to high temperatures
|
Uses include:
 Wider application areas
|
The following table below shows Neodymium in comparison with other magnet materials, for temperature limitation, maximum energy and cost.
|
|
Magnetic Material |
Temperature -Deg.C
|
Max. Energy - MGOe
|
Relative Cost |
|
|
|
|
|
|
|
|
Neodymium Iron Boron |
|
|
|
|
|
|
|
|
|
|
80 - 200 |
|
|
|
|
|
|
|
|
|
|
50 |
|
|
|
|
|
|
|
|
|
|
33 |
|
Samarium Cobalt |
|
|
|
|
|
|
|
|
|
|
350 |
|
|
|
|
|
|
|
|
|
|
30 |
|
|
|
|
|
|
|
|
|
|
100 |
|
Alnico |
|
|
|
|
|
|
|
|
|
|
500 |
|
|
|
|
|
|
|
|
|
|
8 |
|
|
|
|
|
|
|
|
|
|
20 |
|
Ferrite |
|
|
|
|
|
|
|
|
|
|
180 |
|
|
|
|
|
|
|
|
|
|
4.5 |
|
|
|
|
|
|
|
|
|
|
5 |
|
Magnetic rubber |
|
|
|
|
|
|
|
|
|
|
50 |
|
|
|
|
|
|
|
|
|
|
|
0.8 |
|
|
|
|
|
|
|
|
|
|
10 |
Our most advanced technology: we can make two different series of sintered NdFeB magnets--- ordinary book mold alloy and magnets (HAST NdFeB) based on a strip cast alloy which gives a better chemical stability. We has invested in the production technology enabling to use strip cast material.
HAST NdFeB magnets have higher anticorrosion and can last for 7 days under 120 degree Celsius, 95% humidity and 2atmp with loss of weight less than 3mg/cm2.
Magnetic Properties of Sintered NdFeB Magnets
|
|
| |
|
|
| |
| Grade |
Residual Induction Br |
Coercive Force Hcb |
Intrinsic Coercive Force Hci |
Max. Energy Product BHmax |
Max. Operating Temp.C/F |
| |
KG (mT) |
KOe (KA/m) |
KOe (KA/m) |
MGOe (KJ/m3) |
|
| N35 |
11.7-12.2 (1170-1220) |
≥10.9 (≥868) |
≥12.0 (≥955) |
33-36 (263-287) |
80 / 176 |
| N38 |
12.2-12.5 (1220-1250) |
≥11.3 (≥899) |
≥12.0 (≥955) |
36-39 (287-310) |
80 / 176 |
| N40 |
12.5-12.8 (1250-1280) |
≥11.4 (≥907) |
≥12.0 (≥955) |
38-41 (302-326) |
80 / 176 |
| N42 |
12.8-13.2 (1280-1320) |
≥11.5 (≥915) |
≥12.0 (≥955) |
40-43 (318-342) |
80 / 176 |
| N45 |
13.2-13.8 (1320-1380) |
≥11.6 (≥923) |
≥12.0 (≥955) |
43-46 (342-366) |
80 / 176 |
| N48 |
13.8-14.2 (1380-1420) |
≥11.6 (≥923) |
≥12.0 (≥ 955) |
46-49 (366-390) |
80 / 176 |
| N50 |
14.0-14.5 (1400-1450) |
≥10.0 (≥796) |
≥11.0 (≥876) |
48-51 (382-406) |
60 / 140 |
| N52 |
14.3-14.8 (1430-1480) |
≥10.0 (≥796) |
≥11.0 (≥876) |
50-53 (398-422) |
60 / 140 |
| 30M |
10.8-11.3 (1080-1130) |
≥10.0 (≥796) |
≥14.0 (≥1114) |
28-31 (223-247) |
100 / 212 |
| 33M |
11.3-11.7 (1130-1170) |
≥10.5 (≥836) |
≥14.0 (≥1114) |
31-33 (247-263) |
100 / 212 |
| 35M |
11.7-12.2 (1170-1220) |
≥10.9 (≥868) |
≥14.0 (≥1114) |
33-36 (263-287) |
100 / 212 |
| 38M |
12.2-12.5 (1220-1250) |
≥11.3 (≥899) |
≥14.0 (≥1114) |
36-39 (287-310) |
100 / 212 |
| 40M |
12.5-12.8 (1250-1280) |
≥11.6 (≥923) |
≥14.0 (≥1114) |
38-41 (302-326) |
100 / 212 |
| 42M |
12.8-13.2 (1280-1320) |
≥12.0 (≥955) |
≥14.0 (≥1114) |
40-43 (318-342) |
100 / 212 |
| 45M |
13.2-13.8 (1320-1380) |
≥12.5 (≥995) |
≥14.0 (≥1114) |
43-46 (342-366) |
100 / 212 |
| 48M |
13.6-14.3 (1360-1430) |
≥12.9 (≥1027) |
≥14.0 (≥1114) |
46-49 (366-390) |
100 / 212 |
| 50M |
14.0-14.5 (1400-1450) |
≥13.0 (≥1033) |
≥14.0 (≥1114) |
48-51 (382-406) |
100 / 212 |
| 30H |
10.8-11.3 (1080-1130) |
≥10.0 (≥796) |
≥17.0 (≥1353) |
28-31 (223-247) |
120 / 248 |
| 33H |
11.3-11.7 (1130-1170) |
≥10.5 (≥836) |
≥17.0 (≥1353) |
31-34 (247-271) |
120 / 248 |
| 35H |
11.7-12.2 (1170-1220) |
≥10.9 (≥868) |
≥17.0 (≥1353) |
33-36 (263-287) |
120 / 248 |
| 38H |
12.2-12.5 (1220-1250) |
≥11.3 (≥899) |
≥17.0 (≥1353) |
36-39 (287-310) |
120 / 248 |
| 40H |
12.5-12.8 (1250-1280) |
≥11.6 (≥923) |
≥17.0 (≥1353) |
38-41 (302-326) |
120 / 248 |
| 42H |
12.8-13.2 (1280-1320) |
≥12.0 (≥955) |
≥17.0 (≥1353) |
40-43 (318-342) |
120 / 248 |
| 45H |
13.2-13.8 (1320-1380) |
≥12.0 (≥955) |
≥17.0 (≥1353) |
43-46 (342-366) |
120 / 248 |
| 48H |
13.7-14.3 (1370-1430) |
≥12.5 (≥995) |
≥17.0 (≥1353) |
46-49 (366-390) |
120 / 248 |
| 30SH |
10.8-11.3 (1080-1130) |
≥10.1 (≥804) |
≥20.0 (≥1592) |
28-31 (223-247) |
150 / 302 |
| 33SH |
11.3-11.7 (1130-1170) |
≥10.6 (≥844) |
≥20.0 (≥1592) |
31-34 (247-271) |
150 / 302 |
| 35SH |
11.7-12.2 (1170-1220) |
≥11.0 (≥876) |
≥20.0 (≥1592) |
33-36 (263-287) |
150 / 302 |
| 38SH |
12.2-12.5 (1220-1250) |
≥11.4 (≥907) |
≥20.0 (≥1592) |
36-39 (287-310) |
150 / 302 |
| 40SH |
12.4-12.8 (1240-1280) |
≥11.8 (≥939) |
≥20.0 (≥1592) |
38-41 (302-326) |
150 / 302 |
| 42SH |
12.8-13.2 (1280-1320) |
≥12.4 (≥987) |
≥20.0 (≥1592) |
40-43 (318-342) |
150 / 302 |
| 45SH |
13.2-13.8 (1320-1380) |
≥12.6 (≥1003) |
≥20.0 (≥1592) |
43-46 (342-366) |
150 / 302 |
| 28UH |
10.2-10.8 (1020-1080) |
≥9.6 (≥764) |
≥25.0 (≥1990) |
26-29 (207-231) |
180 / 356 |
| 30UH |
10.8-11.3 (1080-1130) |
≥10.2 (≥812) |
≥25.0 (≥1990) |
28-31 (223-247) |
180 / 356 |
| 33UH |
11.3-11.7 (1130-1170) |
≥10.7 (≥852) |
≥25.0 (≥1990) |
31-34 (247-271) |
180 / 356 |
| 35UH |
11.8-12.2 (1180-1220) |
≥10.8 (≥860) |
≥25.0 (≥1990) |
33-36 (263-287) |
180 / 356 |
| 38UH |
12.2-12.5 (1220-1250) |
≥11.3 (≥899) |
≥25.0 (≥1990) |
36-39 (287-310) |
180 / 356 |
| 40UH |
12.4-12.8 (1240-1280) |
≥11.3 (≥899) |
≥25.0 (≥1990) |
38-41 (302-326) |
180 / 356 |
| 28EH |
10.4-10.9 (1040-1090) |
≥9.8 (≥780) |
≥30.0 (≥2388) |
26-29 (207-231) |
200 / 392 |
| 30EH |
10.8-11.3 (1080-1130) |
≥10.2 (≥812) |
≥30.0 (≥2388) |
28-31 (223-247) |
200 / 392 |
| 33EH |
11.3-11.7 (1130-1170) |
≥10.5 (≥836) |
≥30.0 (≥2388) |
31-34 (247-271) |
200 / 392 |
| 35EH |
11.7-12.2 (1170-1220) |
≥11.0 (≥876) |
≥30.0 (≥2388) |
33-36 (263-287) |
200 / 392 |
| 38EH |
12.2-12.5 (1220-1250) |
≥11.3 (≥899) |
≥30.0 (≥2388) |
36-39 (287-310) |
200 / 392 |
| 28AH |
10.4-10.9 (1040-1090) |
≥9.9 (≥787) |
≥30.0 (≥2624) |
26-29 (207-231) |
230 / 446 |
| 30AH |
10.8-11.3 (1080-1130) |
≥10.3 (≥819) |
≥30.0 (≥2624) |
28-31 (223-247) |
230 / 446 |
| 33AH |
11.3-11.7 (1130-1170) |
≥10.6 (≥843) |
≥30.0 (≥2624) |
31-34 (247-271) |
230 / 446 | |
|
| |
|
|
Typical Physical Properties |
|
Parameter |
Unit |
Value |
|
Curie Temperature |
 Degree C |
310-370 |
|
Maximum Operating Temperature |
 Degree C |
80-180 |
|
Resistivity |
  .cm |
160 |
|
Hardness |
Hv |
560-580 |
|
Density |
g/cm |
7.40 |
|
Relative Recoil Permeability |
rec |
1.05 |
|
Saturation Field Strength |
kOe |
30-40 |
|
kA/m |
2,400-3,200 |
|
Temperature Coefficient of Br |
%/ |
-0.12 ~ -0.10 |
|
Temperature Coefficient of iHc |
%/ |
-0.6 |
Surface Treatments and Dimension Range/Nominal Tolerance
of Sintered NdFeB Magnets (Neodymium Iron Boron)
Surface Treatments
|
Type |
Information |
|
Metallic |
Zinc, Nickel, Nickel + Tin, Nickel + Copper + Nickel, Gold, Ag, Cr |
|
Organic |
Epoxy, Nickel + Epoxy coating |
|
Temporary |
Surface Passivation |
| Available Coatings Of Sintered NdFeB Magnets |
| Surface |
Coating |
Thickness(Microns) of coating |
Color |
Resistance |
Salt spray Test Standard (hours) |
Pressure Coating Test Standard (hours) |
| Passivation |
|
1--2um |
Silver Grey |
Temporary Protection |
Not available |
Not available |
| Nickel |
Ni+Ni |
10--20um |
Bright Silver |
Excellent against Humidity |
24 |
24 |
| Ni+Cu+Ni |
| Zinc |
ZN |
3--8um |
Bright Blue |
Good Against Salt Spray |
24 |
Not available |
| C-Zn |
shiningColor |
Excellent Against Salt Spray |
48 |
Not available |
| CR3+Zinc |
ZN |
3--8um |
Bright Blue |
Good Against Salt Spray |
24 |
Not available |
| C-Zn |
shining Color |
Excellent Against salt Spray |
48 |
Not available |
| Tin |
Ni+Cu+Sn |
10-25um |
Silver |
Superior Against Humidity |
48 |
Not available |
| Gold |
Ni+Cu+Au |
2--10um |
Gold |
Superior Sgainst Humidity |
Not available |
Not available |
| Ag |
Ni+Ag |
2--10um |
Silver |
Superior Against Humidity |
Not available |
Not available |
| Epoxy |
Epoxy |
10-25um |
Black,Grey |
Excellent Against Humidity & Salt Spray |
48 |
Not available |
| Ni+Cu+Epoxy |
Not available |
| Zn+Epoxy |
Not available | |
| Coating Test Standard of Nickel coating |
(1).Salt Spray Test(SST):
Test condition :
Temperature:35C Degree,5% NaCl ,Continous spray for 24 hours.
Test Standard/Criterion:
Coating is good ,doesn’t get off,no bubbles,no dots.no rust appear. |
(2)Pressure cooker Test (PCT):
Test condition :
121C and 95% RH and 2 atmosheric pressure, test for 24 hours
Test Standard/Criterion:
Coating does not Get off, there are no air bubbles or dots Appear | |
Dimension Range / Nominal Tolerance
|
Ring Magnet |
Outer Diameter (mm) |
Inner Diameter (mm) |
Thickness (mm) |
|
Maximum |
220 |
80 |
50 |
|
Minimum |
2.6 |
1.8 |
0.5 |
|
Tolerance |
±0.1 |
±0.1 |
±0.1 |
|
Block Magnet |
Length (mm) |
Width (mm) |
Thickness (mm) |
|
Maximum |
250 |
180 |
50 |
|
Minimum |
2.0 |
1.5 |
0.5 |
|
Tolerance |
±0.1 |
±0.1 |
±0.1 |
|
Disc Magnet |
Diameter (mm) |
Thickness (mm) |
|
Maximum |
220 |
50 |
|
Minimum |
1.2 |
0.5 |
|
Tolerance |
±0.1 |
±0.1 |
Segment & other irregular shapes can be manfactured according to customer's sample or drawing
Magnetization Directions of Permanent Magnets
|
Sintered NdFeB Magnet Production Flow Chart
|
|
