Description
Permanent magnets can be devided into four kinds as below:
(1)AlNiCo magnets; (2)the first generation of magnets is SmCo5
which is called 1:5 Samarium Cobalt Alloy; (3)the second generation
of magnets is Sm2Co*7 which is called 2:*7 Samarium Cobalt Alloy;
(4)the third generation of magnets is NdFeB which is called
Neodymium Iron Boron Alloy. With the development of science and
technology, the performance of Nd-Fe-B permanent magnet have been
continuously improved and its application fields are expanded.
 Sintered NdFeB with high magnetic energy products (*0
megagauss **0kJ/m3), high coercive force (*8EH,*2EH) and high
temperature coefficient (**0C) have been mass
produced.Â
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The main raw material of the NdFeB permanent magnets are the
rare earth metal neodymium (Nd) *2%, the metal elements iron (Fe)
*4% and non-metallic elements boron (B) 1% , adding a small amount
of dysprosium (Dy), terbium (Tb), cobalt(Co), Niobium (Nb), gallium
(Ga), aluminum (Al), copper (Cu) and the like elements. NdFeB
ternary compounds is based on the Nd2Fe*4B, its composition should
be similar with Nd2Fe*4B Formula.Â
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It is have three main parameters: First, Br (Residual
Induction), GAUSS of units, which is the residual magnetic flux
density when the magnetic field is removed from saturation,
representing the external magnetic field strength which it can
provide; Second, Hc (Coercive Force), Oersteds of units, Putting
the magnet on a reverse magnetic field, its properties will
disappear when the applied magnetic field is increased to a certain
intensity, the ability to resist the applied magnetic field is
known as the coercive force, represents the ability to measure the
resistance to demagnetization; Third, BHmax, Gauss-Oersteds of
units, which is the magnetic energy from the unit volume of
material, it is a physical quantity.
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NdFeB, the third generation of rare-earth permanent magnet, is
the most powerful and advanced permanent magnet today. NdFeB has
the high remanence, high coercive force, high energy.Â
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Because of the rich rare earth resources in China and the
ever-changing production process and technological innovation and
progress, it has the high performance and high cost ration and it
can be easily formed into various sizes and different shapes such
as ring,segment, trilateral, block and so on.
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In recent years it's thermal stability along with corrosion
resistance has been greatly improved. Â The working
temperature of the NdFeB has been able to reach more than **0
degrees, and different coatings can be provided auch as NiCuNi,
Double Nickel, Dark Nickel, Bright Nickel, Black Nickel, Chemical
Nickel, White Zinc, Blue & White  Zinc, Colored Zinc,
Black Zinc, Zinc Cr3+, Passivated, Epoxy, Parylene. All our coated
magnets are confiming to standards of International Environmental
Protection.
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It's especially suitable for the all kinds of motors, rare
earth permanent magnet motor has become one of the important trends
in the motor development.
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It widely used in electronics, electric equipment, medical
equipment, toys, packaging, hardware machinery, aerospace and other
fields, common are permanent magnet motor, speaker, magnetic
separation machine, computer disk drives, magnetic resonance
imaging equipment, etc.
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Other physical properties of Nd-Fe-B:
Br temperature coefficient: *0.*1%/C
Density: 7.4g/cm3
Webster's temperature: **0Hv
Tensile heat-distortion: 8.0kg/mm2
Specific heat: 0.*2k Cak(kgC)
Modulus of elasticity: 1.6x***1N/m2
Poisson ratio: Â 0.*4
Curie temperature: ******0C
Resistivity: **4Ω.cmÂ
Flexural strength: *5kg/mm2Â
Coefficient of thermal expansion: 4x***6/C
Thermal conductivity: 7.7cal/m.h.C
Stiffness: 0.*4N/m2
Compression ratio: 9.8x****2m2/N
iHc temperature coefficient: *0.*0%/C
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How to order magnets?
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Please confirm the following details before you order so that
we can cooperate with you more effectively, thank you!
(1). What's the material and performance?
(2). What's the size and the tolerance?
(3). Does it need magnetization? if need,which
one,Axial or Radial?
(4). What's the highest work temperature?
(5). What's the quantity?
(6). What's the coating? Zinc or Nickel coated?
(7). If you need special management, please tell us.
We have more magnets for your choice. Any needs please add my
Skype: joan.stmag
E-mail: *@********************Â Tel:
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