Industrial magnet

Rare earth is called industrial monosodium glutamate and has a wide range of uses. Industrial magnets can be divided into: alnico magnet, ferrite magnet, samarium cobalt magnet, neodymium iron boron magnet.

Characteristic parameters of industrial magnets

Characteristic Unit AlNiCo Series

Ferrite Series

Rare Earth Series

AlNiCo Magnet

Sintered Ferrite Magnet

Bonded Ferrite Magnet

Sintered Samarium Cobalt Magnet

Bonded Samarium Cobalt Magnet

Sintered NdFeB Magnet

Bonded NdFeB Magnet

Residual Induction/Br kG 11.5 4.4 3.1 11.6 8.5 14.2 7.3
Coercive Force/bHc kOe 1.6 2.8 2.4 10.1 7.6 11.7 5.7
Intrinsic Coercivity/iHc kOe 1.7 3.5 3.0 >5.3 11 >11 9
Maximum Energy Product/(BH)max MGOe 11 4.6 2.2 32 17 48 11
Temperature Coefficientα/α(Br) %/K -0.02 -0.18 -0.18 -0.0.3 -0.03 -0.11 -0.10
Temperature Coefficientβ/β(iHc) %/K ~0 +0.4 +0.4 -0.2 -0.2 -0.6 -0.4
Curie Temperature/Tc 845 460 460 795 795 335 335
Flexure Strength kgf/mm2 28 13 6 12 6 25 6
Density/ρ g/cm3 7.3 5.0 3.6 8.4 7.0 7.5 6.0
Hardness/Hv 650 530 550 80-120 600 80-120
Electrical Resistivity μΩ•cm 60 >1010 80 44000 150 26000

Description of the characteristic distribution of industrial magnets

For the permanent magnets commonly used in the market, we have aggregated the following figure to compare the characteristics of the permanent magnets. The higher the upper right, the higher the magnetic energy product. It can be seen that the magnetic advantages of NdFeB sintered magnets over other magnets, and the magnetic advantages of NdFeB bonded magnets over Ferrite magnets.

20141218130907 41082 - Industrial magnet

Description of the advantages and disadvantages of industrial magnets

Advantages Disadvantages
AlNiCo Magnet
  • High residual induced magnetic force Br
  • Lowest temperature coefficient
  • The internal coercive force iHc is very low, easy to demagnetize
  • The price of cobalt and nickel among the main raw materials is unstable

Ferrite Sintered Magnet
  • The main raw materials are abundant and the price is the lowest
  • Excellent chemical stability, no surface treatment required

  • Poor magnetic properties
  • High temperature coefficient

Samarium Cobalt Sintered Magnet
  • Excellent magnetic properties
  • Good temperature stability
  • No surface treatment required

  • The main raw materials of samarium and cobalt are expensive
  • Low mechanical strength, difficult to process
NdFeB Sintered Magnet
  • The best magnetic properties
  • The main raw materials are cheaper than samarium cobalt magnets
  • Higher mechanical strength than samarium cobalt magnet

  • Poor temperature stability
  • Easy to oxidize, need surface treatment

NdFeB Bonded Magnet
  • High degree of freedom of shape
  • High dimensional accuracy
  • Can be made into soft magnet
  • Can be integrated with other parts

Magnetic performance is lower than sintered magnet

Summary: Each of the four industrial magnets has advantages and disadvantages.

  • NdFeB has obvious advantages in various aspects, but the disadvantage is low temperature resistance coefficient and easy oxidation.
  • Ferrite is cheap and has a wide range of uses. The disadvantage is that the magnetic energy product is low.
  • The temperature coefficient of AlNiCo is good, but the disadvantage is that it is brittle and the price is not low.
  • Samarium cobalt temperature coefficient and magnetic energy product are relatively balanced, but the disadvantage is that it is expensive.
  • Magnet users can choose suitable magnets according to their own needs and magnet characteristics.

Source: China Permanent Magnet Manufacturer – www.ymagnet.com

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