Sintering and Casting AlNiCo Magnet

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  • Sintering and Casting AlNiCo Magnet

PRODUCTS DETAILS

AlNiCo magnets have stable performance and excellent quality. They are mainly used in water meters, sensors, electronic tubes, traveling wave tubes, radar, suction parts, clutches and bearings, motors, relays, control devices, generators, jigs, receivers, telephones, reed switches, speakers, handheld tools, scientific and educational products, etc.
 Grade) American Standard  Br   Hcb  BH max Density  Reversible temperature coefficient  Reversible temperature coefficient  Curie temperature TC  Maximum operating temperature TW Remarks 
mT Gs KA/m Oe KJ/m³ MGOe

6.9

% /℃

% /℃

LN10

ALNICO3

600

6000

40

500

10

1.2

7.2

-0.03

-0.02

810

450

 

Isotropic

 

LNG13

ALNICO2

700

7000

48

600

12.8

1.6

7.3

-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

44

4.65

7.3

-0.02

+0.02

850

525

      anisotropy     

LNG40

ALNICO5

1250

12500

48

600

40

5

7.3

-0.02

+0.02

850

525

LNG44

ALNICO5

1250

12500

52

650

37

5.5

7.3

-0.02

+0.02

850

525

LNG52

ALNICO5DG

1300

13000

56

700

52

6.5

7.3

-0.02

+0.02

850

525

LNG60

ALNICO5-7

1350

13500

59

740

60

7.5

7.3

-0.02

+0.02

850

525

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

ALNICO8

820

8200

110

1380

40

5

7.3

-0.025

+0.02

860

550

LNGT60

ALNICO9

950

9500

110

1380

60

7.5

7.3

-0.025

+0.02

860

550

LNGT72

ALNICO9

1050

10500

112

1400

72

9

7.3

-0.025

+0.02

860

550

Physical properties of AlNiCo
Parameter AlNiCo
Curie temperature(℃) 760-890
Maximum operating temperature(℃) 450-600
Vickers hardness Hv(MPa) 520-630
Density(g/cm³) 6.9-7.3
Resistivity(μΩ ·cm) 47-54
Temperature Coefficient of Br(%/℃) 0.025~-0.02
Temperature coefficient of iHc(%/℃) 0.01~0.03
Tensile  strength(N/mm) <100
Transverse breaking strength(N/mm) 300
Alnico permanent magnet materials can't be designed as structural parts due to the features of low mechanical strength, high hardness, brittleness, and poor machinability. Only a little grinding or EDM can be used during processing, other methods like forging and other machining can't be used. AlNiCo is mainly produced by casting method. In addition, powder metallurgy can also be used to make sintered magnets, which has slightly lower performance. Cast AlNiCo can be processed into different sizes and shape while sintered AlNiCo products are mainly small-sized. And the workpieces of sintered AlNiCo have better dimensional tolerances, the magnetic properties are a little bit lower but the machinability is better. The advantage of AlNiCo magnets is high remanence (up to 1.35T), but the shortage is that the coercive force is very low (usually less than 160kA/m), and the demagnetization curve is non linear, so AlNiCo is a magnet easy to be magnetized and also easy to be demagnetized. When magnetic circuit designing and device manufacturing, special attention should be paid and the magnet must be stabilized in advance. In order to avoid partial irreversible demagnetization or distortion of magnetic flux density distribution, it is strictly forbidden to contact with any ferromagnetic substances during use. Cast AlNiCo permanent magnet has the lowest reversible temperature coefficient among the permanent magnet materials, the working temperature can reach up to 525°C, and the Curie temperature to 860°C, which is the permanent magnet material with the highest Curie point. Due to good temperature stability and aging stability, AlNiCo magnets are well applied in motors, instruments, electroacoustic devices, and magnetic machinery, etc.

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