AlNiCo Magnets

Alnico materials (composed predominantly of aluminum,nickel,and cobalt with minor amounts of other elements including titanium and copper) permit design latitudes providing high indications,high energies and relatively high coercivities.AlNiCo magnets are characterized by excellent temperature stability and good resistance to demagnetization from vibration and shock.Alnico magnets offer the best temperature characteristics of any standard production magnet material available,.They can be used for continuous duty applications where temperature extremes up to 930F can be expected.

Alnico magnetsl are manufactured through either a casting or sintering process. Alnico magnet is very hard and brittle.Machining or drilling can not therefore be accomplished by ordinary methods.Holes are usually cored in at the foundry.Magnets are cast or sintered as closely as possible to required sized so that abrasive grinding to finish dimensions and tolerances is minimized

Specialized casting techniques used to achieve the unique crystalline grain orientation found in the alnico 5 and 8 grades.These anisotropic grades are designed to produce high magnetic output in a specified direction.Orientation is achieved during heat treatment, by cooling the casting from 2000F at a controlled rate within a magnetic field which conforms to the preferred direction of magnetization. Alnico 5 and Alnico 8 are anisotropic and exhibit a preferred direction of orientation,Magnetic orientation should be specified on your drawing when you send an order to us.
Cast Alnico 5 is the most commonly used of all the cast Alnico's .It combines high indications with a high energy product of 5 MGOe or more and is used extensively in rotation machinery, communications, meters and instruments, sensing devices and holding applications. The higher resistance to demagnetization(coercive force) of Alnico 8,cobalt content to 35%,allows this material to function well for short lengths or for length to diameter ratios of less than 2 to 1.

Sintered Alnico materials offer slightly lower magnetic properties but butter mechanical characteristics than the cast Alnico materials.Sintered Alnico magnets are most suitable in small sizes(less than 1 oz.)in this process. The desired mix of metal powder is pressed to shape and size in a die,then sintered at 2300 F in a hydrogen atmosphere.The sintering process is well suited to large volume production,and results in parts which are structurally stronger than cast magnets.Relatively close tolerances can be achieved without grinding.

The Characteristics of Alnico Magnet:

*Small changes in magnetic properties to temperature effects

*Maximum working temperature can be as high as 450oC~550oC.

*Low coercive force.

*Strong corrosion resistance capability,no coating needed for surface protection.

Typical Applications for Alnico magnet:

Widely used applications such as instruments and meters which require very stable temperature properties.

Electronic ignition systems,watt bour meters,volt-amp meters.medical instruments,industrial motors,magnetic reed switches,generators,hand tools,vending machines.

Typical Magnetic Performance Range for Cast Alnico Magnet

alnico holding magnet
cast alnico magnet
cast alnico magnet
alnico assemblies
alnico assemblies
alloy alnico

Grade

Br

Hc

(BH)max

MMPA Equivalent

Temp. Coefficient

 

Tc

Tw

mT

KGs

KA/M

Oe

KJ/m3

MGOe

%/

LN9

690

6.9

37

470

10.0

1.25

Alnico1

-0.03

760

500

LNG12

700

7

40

500

12.0

1.50

Alnico2

-0.03

810

500

*LNG13

680

6.8

48

600

12.0

1.50

Alnico2

-0.03

810

500

*LN10

600

6

40

500

10

1.2

Alnico3

-0.03

760

500

LNGT18

580

5.8

90

1130

18.0

2.20

[l.Alnico7]

-0.03

860

500

LNG16

800

8

53

660

16.0

2.00

[Alnico4]

-0.02

850

500

LNG34

1180

11.8

44

550

35.0

4.30

[Alnico5C]

-0.02

890

500

LNG37

1180

11.8

48

600

37.0

4.65

Alnico 5

-0.02

890

500

LNG40

1220

12.2

48

600

40.0

5.00

-0.02

890

500

LNG44

1220

12.2

52

650

44.0

5.50

Alnico 5 DG

-0.02

890

500

LNG 52

1250

12.5

55

690

52.0

6.50

Alnico 5-7

-0.02

890

550

LNG60

1300

13

56

700

60.0

7.50

Alnico 6

-0.02

890

500

LNGT28

1050

10.50

56

700

28.0

3.50

Alnico 8

-0.02

860

550

LNGT32

800

8

104

1300

34

4.25

-0.03

860

550

LNGT38

820

8.2

110

1380

38.0

4.75

-0.03

860

550

LNGT44

880

8.8

120

1500

44.0

5.50

-0.03

860

550

LNGT60

900

9

110

1380

60

7.5

Alnico 9

-0.03

860

550

LNGT72

1050

10.5

112

1410

72

9

 

-0.03

860

550

LNGT36J

700

7

140

1750

36

4.5

Alnico 8HC

-0.03

860

550

Demagnetization Curve of Cast Alnico MagnetDemagnetization Curve of Cast Alnico Magnet

Sintered AlNiCo Permanent Alloy

Isotropy AlNiCo Bonded Magnet

 

l Inspection standard for permanent magnet

l Purchasing Guide

l Permanent magnet supply direction

l Surface protection and surface coating for the permanent magnet

l Quality warranty

l Safety principle for manual operation of permanent magnet

 

Home  NdFeB magnet  SmCo magnet  Ferrite magnet

 
 
Home

Copy Right 2001 YUXIANG Magnetic Materials Ind. Co.,Ltd. All Rights Reserved
Add :F/16, Jinyuan plaza, # 57 South Hubin.Road, Xiamen, CHINA 361004
Tel : (86)592 2295387 (86)592 2217138 Fax: (86)592 2207122
Email : yingli@magnets.com.cn   mag@e-magnet.cn