ALUMINUM NICKEL COBALT MAGNETS

The Alnico (Aluminum, Nickel, Cobalt) family was introduced in the 1930's. It's characterized by excellent temperature stability, high residual induction, and relatively high energies. These were the first materials specifically designed for permanent magnets to be used in meters and instruments commercially.

Alnico is vailable in both cast and sintered forms. Sintered Alnico offer slightly lower magnetic properties but better mechanical characteristics than cast Alnico. These materials are brittle, hard and cannot effectively be machined by conventional techniques other than by grinding.

Cast Alnico Magnets
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Typical Magnetic Properties
Material

Max. Energy Product

Remanence

Coercive Force

Rev. Temp. Coeff.

Curie Temp.

Working Temp.

Density

(BH)max

Br

Hc

Hci

Br

Hci

Tc

 Tw

D
MGOe
kJ/m3
kG
mT
Oe
kA/m
Oe
kA/m
%/°C
%/°C
°C
°C
g/cm3
Alnico 2
1.6
12.8
7.0
700
580
47
600
48
-0.03
-0.02
810
450
7.0
Alnico 3
1.2
10.0
6.0
600
480
38
500
40
-0.03
-0.02
810
450
6.9
Alnico 5
5.0
40.0
12.5
1250
640
51
640
51
-0.02
+0.02
860
525
7.3
Alnico 5DG
6.5
52.0
13.0
1300
680
55
700
56
-0.02
+0.02
860
525
7.3
Alnico 5-7
7.5
60.0
13.5
1350
740
59
740
59
-0.02
+0.02
860
525
7.3
Alnico 6
3.5
28.0
10.0
1000
720
58
720
58
-0.02
+0.03
860
525
7.3
Alnico 8
5.0
40.0
8.0
800
1480
119
1500
120
-0.025
+0.02
860
550
7.3
Alnico 8B
5.5
44.0
8.5
850
1550
124
1550
124
-0.025
+0.02
860
550
7.3
Alnico 8HE
6.0
48.0
9.0
900
1500
120
1500
120
-0.025
+0.02
860
550
7.3
Alnico 8HC
4.5
36.0
7.0
700
1880
151
1900
152
-0.025
+0.02
860
550
7.3
Alnico 9
9.0
72.0
10.5
1050
1400
112
1400
112
-0.025
+0.02
860
550
7.3
ISO 9001:2008 Quality Standard Certified
Special properties can be achieved with custom method.

Sintered Alnico Magnets
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Typical Magnetic Properties
Material
Max. Energy Product
Remanence
Coercive Force
Rev. Temp. Coeff.
Curie Temp.
Density
(BH)max
Br
Hc
Hci
%/°C
Tc
D
MGOe
kJ/m3
kG
mT
Oe
kA/m
Oe
kA/m
%/°K
°C
g/cm3
Alnico 2
1.5
12.0
7.1
710
550
44
570
45
 -0.014
810
7.0
Alnico 5
3.9
31.2
10.5
1050
590
47
600
48
 -0.016
850
7.2
Alnico 6
3.0
23.8
10.0
1000
700
56
710
57
 -0.020
850
7.2
Alnico 8
4.0
32.0
8.0
800
1550
123
1600
128
 -0.020
850
7.2
Alnico 8HC
4.5
36.0
6.5
650
1700
136
1880
150
 -0.020
850
7.2
ISO 9002 Quality Standard Certified
Special properties can be achieved with custom method.




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