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Alnico Magnets (Aluminium-Nickel-Cobalt Magnets)
 

Alnico magnets are made primarily from aluminum, nickel, cobalt, copper, iron and sometimes titanium. They can be either cast or sintered.

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Cast Alnico
Cast alnico is melted and poured into a mold. Once solidified, the material is rough ground and then heat-treated and cooled, sometimes in a magnetic field. When treated in the presence of a magnetic field, the magnet is called anisotropic. This orients the material to take on maximum magnetization and allows a higher gauss level. A cast magnet that is not heat-treated in a magnetic field is called isotropic. After heat treatment and cooling, the material can be ground to specific tolerances and then magnetized.

Sintered Alnico
Sintered alnico is made from a powdered mixture of ingredients that are pressed into a die under tons of pressure, sintered in a hydrogen atmosphere and then cooled either within a magnetic field or without (anisotropic vs. isotropic).

Alnico magnets have applications in the following areas:

  • Electric motors

  • Electric guitar pickups

  • Microphones

  • Sensors

  • Loudspeakers

  • Cow magnets

  • Automotive and electronic sensors

  • Actuators

  • Hall effect sensors

  • Magnetron

  • Reed switches

  • TWT amplifiers

  • Communication

Custom-made Alnico Magnets for your applications:

  • Courteous engineering assistance

  • Prompt sample manufacturing

  • We meet any feasible properties required by your project

 

 

Selectable sizes:

Ring Magnet Outer Diameter (mm) Inner Diameter Thickness (mm)
Maximum 100 80 100
Minimum 4 2 5
Tolerance ±0.01 ±0.01 ±0.01

 
Block Magnet Lenght (mm) Width (mm) Thickness (mm)
Maximum 100 80 50
Minimum 2 2 2
Tolerance ±0.01 ±0.01 ±0.01

 
Disc Magnet Diameter (mm) Thickness (mm)
Maximum 100 100
Minimum 2 2
Tolerance ±0.01 ±0.01

Segment & other irregular shapes can be manfactured according to customer's sample or drawing/blue print

See Full Magnetic Properties Table of Alnico Magnets
 

Sintered Alnico Magnets
Casted Cylinder Magnets

Casted Block Magnets
Casted Horseshoe Magnets

 

Material standard qualities

  • Production by casting or powder metallurgical techniques

  • An alloy composed of matrix of Al-Ni-Fe-Co

  • Excellent stability over a wide temperature range higher than 500°C

  • Strong corrosion resistance capability without coating for surface protection

  • Good resistance to demagnetization from vibration and shock

  • Good flux density at an reasonable cost

  • Very hard & brittle
 

Typical Physical Properties

Curie Temperature (°C)

860

Maximum Operating Temperature (°C)

525-550

Resistivity (µ ohm.cm)

47-54

Hardness (Hv)

520-630

Density (g/cm3)

6.90-7.30

Relative Recoil Permeability (µrec)

1.70-4.70

Saturation Field Strength, kOe (kA/m)

2.7-6.3 (215-500)

Temperature Coefficient of Br (%/°C)

-0.025 ~ -0.02

Temperature Coefficient of iHc (%/°C)

+0.01 ~ +0.03

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Magnetic Properties of Alnico Magnets

Material Grade

Item

Remanence

Intrinsic Coercivity

Max. Energy Product

Br (mT)

Br (kGs)

iHc (kA/m)

iHc (kOe)

(BH)max (KJ/m3)

(BH)max (MGOe)

Alnico 3

*LN9

680

6.8

30

0.38

9.0

1.13

*LN10

600

6.0

39.8

0.50

10.0

1.20

Alnico 2

*LNG12

720

7.2

39.8

0.5

12.4

1.55

*LNG13

700

7.0

48.0

0.60

12.8

1.60

Alnico 5

LNG37

1200

12.0

48.0

0.60

37.0

4.65

LNG40

1250

12.5

48.0

0.60

40.0

5.0

LNG44

1250

12.5

52.0

0.65

44.0

5.5

Alnico 5DG

LNG52

1300

13.0

56.0

0.70

52.0

6.5

Alnico 5-7

LNG60

1350

13.5

59.0

0.74

60.0

7.5

Alnico 6

LNGT28

1000

10.0

58.0

0.72

28.0

3.5

Alnico 8HC

LNGT36J

700

7.0

140.0

1.75

36.0

4.5

Alnico 8

*LNGT18

580

5.8

100.0

1.25

18.0

2.2

Alnico 8

LNGT32

800

8.0

100.0

1.25

32.0

4.0

LNGT40

800

8.0

110.0

1.38

40.0

5.0

Alnico 9

LNGT60

900

9.0

110.0

1.38

60.0

7.5

LNGT75

1050

10.5

112.0

1.4

72.0

9.0

Magnetic Properties of Sintered Alnico

Material Grade

Remanence

Coercivity

Intrinsic Coercivity

Max. Energy Product

Br (mT)

Br (kGs)

bHc (kA/m)

bHc (kOe)

iHc (kA/m)

iHc (kOe)

(BH)max (KJ/m3)

(BH)max (MGOe)

*FLN8

520

5.2

40

0.5

43

0.54

8-10

1.0-1.25

*FLNG12

700

7.0

40

0.5

43

0.54

12-14

1.5-1.75

*FLNGT14

570

5.7

76

0.95

78

0.98

14-16

1.75-2.00

*FLNGT18

560

5.6

88

1.1

90

1.13

18-22

2.25-2.75

FLNG28

1050

10.5

46

0.58

47

0.59

28-33

3.5-4.15

FLNG34

1100

11.0

50

0.63

51

0.64

34-38

4.3-4.8

FLNGT28

1000

10.0

56

0.7

57

0.71

28-30

3.5-3.8

FLNGT31

780

7.8

104

1.3

90

1.13

31-36