What is alnico permanent magnet?

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What is alnico permanent magnet?

Alnico Magnet is an alloy made of aluminum, nickel, cobalt, copper, iron and other materials.

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Aluminum nickel cobalt (Alnico Magnet) permanent magnet material was successfully developed in the 1930s. It is the first permanent magnetic material developed in history. It is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements. Before the discovery of rare earth permanent magnet materials in 1970s, Alnico Magnet alloy was the strongest permanent magnet material. However, with the advent of ferrite permanent magnet and rare earth permanent magnet, Alnico Magnet permanent magnet was gradually replaced in many applications, and its proportion was declining.

Classification of Alnico Magnet

Because of its low mechanical strength, high hardness, brittleness and poor machinability, Alnico Magnet permanent magnet can not be designed as structural parts. Only a small amount of grinding or EDM can be carried out during machining, and forging and other machining can not be used. Alnico Magnet is mainly produced by casting method. In addition, sintered magnets corresponding to cast magnets can also be made by powder metallurgy, but the properties are slightly lower.

Performance parameter of Alnico Magnet

American Standard

alincomagnet table1 - What is alnico permanent magnet?

Magnetic properties of cast Alnico magnets

t1 - What is alnico permanent magnet?

Chinese standard

Grade

        Classification of MMPA

Remanent magnetism/Br

coercivity/Hcb

Maximum magnetic energy product/(BH)max

Curie temperature/Tc

Working temperature/Tw

Remanence temperature coefficient

/

T.C.α(Br)

mT/Gs

kA/m/Oe

kJ/m3/MGOe

%/℃

Typical value

Typical value

Typical value

Typical value

Typical value

Typical value

FLN8

S.ALNICO3

500/5000

40/500

8/1.00

760

450

-0.022

FLNG12

S.ALNICO2

650/6500

48/600

12/1.50

810

450

-0.014

FLNGT18

S.ALNICO7

600/6000

90/1130

18/2.20

860

450

-0.02

FLNG34

S.ALNICO5

1200/12000

48/600

34/4.25

890

450

-0.016

FLNGT28

S.ALNICO6

1050/10500

56/700

28/3.50

850

450

-0.02

FLNGT38

S.ALNICO8

800/8000

120/1500

38/4.75

850

450

-0.02

FLNGT42

S.ALNICO8

880/8800

120/1500

42/5.25

820

450

-0.02

FLNGT33J

S.ALNICO8HC

700/7000

140/1750

33/4.13

850

450

-0.025

Note: customers have special requirements, according to customer requirements. Curie temperature and temperature coefficient are only for reference, not for judgment.

Performance Curve of Alnico Magnet

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Processing technology of Alnico Magnet

According to the different processing technology, it can be divided into casting Alnico magnet and sintering Alnico magnet.

  • The production process of cast Alnico Magnet: batching → smelting → casting → heat treatment → performance testing → machining → inspection → packaging
  • The production process of sintered Alnico Magnet is as follows: batching → pulverizing → pressing → sintering → heat treatment → performance testing → machining → inspection → packaging

Casting Alnico Magnet can be processed into different sizes and shapes; sintered Alnico Magnet is mainly small-sized products, and the dimensional tolerance of the blank produced by sintered Alnico Magnet is better than that of the casting product, and the magnetic property is slightly lower than that of the casting product, but the machinability is better.

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Properties and applications of Alnico Magnets

The advantages of Alnico Magnets are high remanence (up to 1.35t), but the disadvantages are very low coercivity (usually less than 160kA / M) and nonlinear demagnetization curve. Therefore, Alnico magnet is easy to be magnetized and demagnetized easily. Special attention should be paid to its particularity when designing and manufacturing the magnetic circuit of the device, and the magnet must be stabilized in advance. It is strictly forbidden to use it in any way Contact with ferromagnetic materials to avoid local irreversible demagnetization or distortion of magnetic flux density distribution.
In permanent magnet materials, cast Alnico Magnet permanent magnet has the lowest reversible temperature coefficient. It is suitable for the manufacture of mechanical, electrical and magnetic devices.

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