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NdFeB Magnet

Neodymium Iron Boron (NdFeB) magnets , a sort of Rare Earth magnet material,has the high remanence, high coercive force, high Maximum energy and is easily formed into various sizes,shapes.So they have been widely used in commercially available fields since the mid -1980's.

It can be manufactured by sintering, compression bonding, injection molding, and extrusion. The sintered form holds the highest energy product of up to 48MGOe, while the bonded form holds a lower energy product of up to 10MGOe.Furthermore,The majority of NdFeB magnets are anisotropic and can only be magnetized in the orientation direction.

NdFeB Magents are prone to corrosion in humid environments, It usually need surface treatment according to customer's requirements to protect magnet.

  

Click Here =>Typical Magnetic Performance for Sintered NdFeB

Surface Protection and coatings

Surface
Type
Minimal layer thickness
Surface Color
Remarks
Passivation
   <=1µ Silver grey Temperary Protection
Nickel coating
 Ni+Ni 10-20µ Silver semibright Excellent resistance to humid atmosphere
Ni+Cu+Ni Superior resistance to humid atmosphere
Zinc coating
 Zn 8-20µ Blue whiteshining color shining Good resistance to salt spray
C-Zn Excellent resistance to salt spray
Tin coating
 Ni+Cu+Sn 15-20µ Silver semibright Superior resistance to humid atmosphere
Gold coating
Ni+Cu+Au 10-20µ Gold shining Superior resistance to humid atmosphere
Cupper coating
Ni+Cu 10-20µ Gold shining Temporary treatment
Epoxy
 Ni+Cu+Epoxy 15-25µ Black Excellent climatic and salt spray resistance
Zn+Epoxy
Chemical Coating
Ni 10-20µ Silver semibright Excellent resistance to humid atmosphere

NdFeB Physical Properties

Temp.Coeff.of Br:
-0.11%/°C
Temp.Coeff.of iHc:
-0.60%/°C
Density:
7.4-7.6g/cm3
Curie Temperature:
310-340°C
Vickers Hardness:
600HV
Electrical Resistivity:
144
Tensile Strength:
8kg/mm2
Flexural Strength:
25kg/mm
Specific Heat:
0.12kcal/(kg.°C)
Coef.of Thermal Expansion:
4x10-6
Thermal conductivity:
7.7kcal/m.h.°C
Young's Modulus:
1.6x1011N/m2
 Rigidity:
0.64N/m2
Poisson's Ratio:
0.24
 Compressibility:
9.8x10-12 m2/N

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