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Neodymium (NdFeB)

 
 

Neodymium Magnet (chemical formula NdFeB) is mainly made of Neodymium, Iron, and Boron, with excellent magnetic strength, relatively abundant raw material and at reasonable prices (in terms of cost/strength ratio).

There are 2 main kinds of production methods which makes totally different appearance, physical and magnetic properties.
1) Sintered Neodymium
2) Bonded Magnets

Apart from above, we also produce Injected mode NdFeB Magnet. This is the perfect combination of injection process and high-property rare-earth powder, makes it possible to form ultra-thin ring and block magnets in complex shapes. This process provides high precision of the end products.

They are widely used in motor, micromotor, computer, instruments, car, motor-bike, HIFI, electric appliances, magentic theraphy and other fields of daily life.

  
 

Sintered Neodymium (NdFeB Magnet)

  
  - Produced by powder metallurgical method with chemical composition of Nd2Fe14B
- Very brittle and hard
- Poorest corrosion resistance of all commercial magnetic material
- Excellent cost to performance ratio
- Not suitable for application which exposed in high temperature conditions		  
 
Physical Properties
Paramters Unit Values
Curie Temperature °C 310-370
Maximum Operating Temperature °C 70-180 (depends on grades)
Resistivity μW.cm 160
Hardness Hv 560-580
Density g/cm3 7.4
Relative Recoill Permeability μ rec 1.05
Saturation Field Strength kOe 30-40
kA/m 2400-3200
Temp. Coefficient of Br. %/°C -0.12 ~ 0.10
Temp. Coefficient of iHc %/°C -0.6
 
 
Surface Treatments
Type    
Metallic   Zinc,
Nickel,
Nickel + Nickel,
Copper + Nickel,
Nickel + Copper + Nickel,
Gold
Orgainic   Epoxy, Nickel + Epoxy coating
Temporary   Surface Passivation
 
 
Magnetic Properties
 

 
Bonded Magnet

 
  - Composition of hard ferrite or rare earth magnet powders are mixed in thermoplastic.
- Good resistance to corrosion and chips
- All or only part of the magnet can be magnetised
- Max. Working temperature 120°C		  
 
Physical Characteriestics
Type Curies Temperature Max Working Temperature Temperature Coefficient Density
Tc (degree C) Tw (degree C) alpha(Br) beta(iHe) D (g/cm square)
BTM-4 320 120 0.13 0.4 5.8-6.2
BTM-6 390 120 0.083 0.35 5.8-6.2
BTM-8 470 150 0.07 0.35 5.8-6.2
BTM-10 470 150 0.07 0.35 5.8-6.2
BTM-12 320 >80 0.05 0.35 5.7-6.1
BTM-L 320 >80 0.05 0.35 5.7-6.1
 
 
Magnetic Properties
Type Remanence Coercivity Intrinsic Coercivity Max. Energy Product
Br(mT) Br(Gs) bHc(kA/m) bHc(Oe) iHc(kA/m) iHc(Oe) (BH)max(KJ/m) (BH)max(MGOe)
BTM-4 350-450 3.5-4.5 3.0-3.5 240-280 640-800 8-10 3-4 24-32
BTM-6 500-600 5.0-6.0 320-360 4.0-4.5 640-800 8-10 5-7 40-56
BTM-8 550-650 5.5-6.0 360-400 4.5-5.0 960-1120 12-14 7.5-8.5 60-68
BTM-10 650-700 6.5-7.0 400-440 5.0-5.5 640-800 8-10 9-10 72-80
BTM-12 700-800 7.0-8.0 440-480 5.5-6.0 720-880 10-12 10-12 80-96
BTM-L 700-800 7.0-8.0 160-220 2.0-2.5 175-240 2.2-3.0 4.5-6.5 36-52
 
  Injected NdFeB Magnets  
 
Magnetic Properties
牌號 Brand Residual Induction Coercive Force Intrinsic Coercivity Max. Energy Product
Br(mT) Br(Gs) bHc(kA/m) bHc(Oe) iHc(kA/m) iHc(Oe) (BH)max(KJ/m) (BH)max(MGOe)
BTZM-3 330-510 3.3-5.1 270-875 3.4-11.0 270-875 3.4-11.0 20-28 2.5-3.5
BTZM-4 450-560 4.0-5.6 183-310 2.3-3.9 270-875 3.4-11.0 28-36 3.5-4.5
BTZM-5 450-550 4.5-5.5 215-358 2.7-4.5 270-875 3.4-11.0 36-44 4.5-5.5
BTZM-6 480-580 4.8-5.8 246-398 3.1-5.0 270-1353 3.4-17.0 40-52 5.0-6.5
BTZM-7 530-620 5.3-6.2 342-413 4.3-5.2 518-875 6.5-11.0 48-60 6.0-7.5
 
     
 
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