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Alnico Magnets 

Alnico Magnets


- High working temperature.
- Easy to be demagnetized.
- Resistant to corrosion
- Hard and brittle.

Alnico magnets are mainly composed of alloys of Aluminum, Nickel, and Cobalt. They are manufactured through either casting or sintering process.

Alnico offers high magnetic field
Alnico has relative high Residual Induction upto 11,000 Gauss and produce high magnetic field around it.

Alnico has a low coercive force
The Hc of Alnico drops in the range of 500 - 1,800 Oe, so that it is easily demagnetized if not handled with care. In order to get a good work point of Alnico, the ratio of length to diameter should be 5:1 or larger.

Alnico is hard and brittle
Alnico can be machined by Grinding and EDM only.

Cast Alnico Properties

Grades Equivalent MMPA   Remanence Br Coercive Force Hcb Maximum Energy Product  (BH)max Density Reversible Temp. Coefficient а(Br) Reversible Temp. Coefficient а(Hc) Curie Temp. TC Working Temp. TW Remark 
mT Gs KA/m Oe KJ/m3 MGOe g/cm3 %/oC %/oC oC oC
LN10 Alnico3 600 6000 40 500 10 1.2 6.9 -0.03 -0.02 810 450

Isotropy

LNG13 Alnico2 700 7000 48 600 12.8 1.6 7.2 -0.03 +0.02 810 450
LNGT18 Alnico8  580 5800 100 1250 18 2.2 7.3 -0.025 +0.02 860 550
LNG37 Alnico5 1200 12000 48 600 37 4.65 7.3 -0.02 +0.02 850 525 Anisotropy
LNG40 1250 12500 48 600 40 5 7.3
LNG44 1250 12500 52 650 44 5.5 7.3
LNG52 Alnico5DG 1300 13000 56 700 52 6.5 7.3
LNG60 Alnico5-7 1350 13500 59 740 60 7.5 7.3
LNGT28 Alnico6 1000 10000 57.6 720 28 3.5 7.3 -0.02 +0.03 850 525
LNGT36J Alnico8HC 700 7000 140 1750 36 4.5 7.3 -0.025 +0.02 860 550
LNGT38 Alnico8 800 8000 110 1380 38 4.75 7.3 -0.025 +0.02 860 550
LNGT40 820 8200 110 1380 40 5 7.3 -0.025 860 550
LNGT60 Alnico9 950 9500 110 1380 60 7.5 7.3 -0.025 +0.02 860 550
LNGT72 1050 10500 112 1400 72 9 7.3 -0.025 860 550

Sintered Alnico Properties

Grades

Equivalent MMPA

Remanence Br

Coercive Force Hcj

Coercive Force Hcb

Maximum Energy Product(BH)max

Density

Reversible Temp. Coefficient α(Br)

Curie Temp. TC

Working Temp. TW

Remark

mT

Gs

KA/m

Oe

KA/m

Oe

KJ/m3

MGOe

g/cm3

%/oC oC oC

SLN8

Alnico3

520

5200

43

540

40

500

8-10

1.0-1.25

6.8

-0.02

760

450

Isotropy

SLNG12

Alnico2

700

7000

43

540

40

500

12-14

1.5-1.75

7.0

-0.014

810

450

SLNGT18

Alnico8

600

6000

107

1350

95

1200

18-22

2.25-2.75

7.2

-0.02

850

550

SLNGT28

Alnico6

1000

10000

57

710

56

700

28-30

3.5-3.8

7.2

-0.02

850

525

Anisotropy

SLNG34

Alnico5

1100

11000

51

640

50

630

34-38

3.5-4.15

7.2

-0.016

890

525

SLNGT31

Alnico8

780

7800

106

1130

104

1300

33-36

3.9-4.5

7.2

-0.02

850

550

SLNGT38

800

8000

126

1580

123

1550

38-42

4.75-5.3

7.2

-0.02

850

550

SLNGT42

880

8800

122

1530

120

1500

42-48

5.3-6.0

7.25

-0.02

850

550

SLNGT38J

Alnico8HC

730

7300

163

2050

151

1900

38-40

4.75-5.0

7.2

-0.02

850

550