Alnico Magnets

Alnico MagnetAlnico magnet alloy is largely comprised of Aluminum, Nickel, Cobalt and Iron. Alnico is a moderately expensive magnet material because of the Cobalt and Nickel content. This alloy has very good corrosion resistance and a high maximum operating temperature. Some grades of this alloy can operate upwards of 550•C. Magnets made with this alloy are available in a variety of grades and dimensions and they are usually cast and finish ground to size. Alnico magnet material is a mature technology and it has a relatively low Energy Product (BHmax) . This material is now mainly used in military, aerospace, older proprietary designs and in applications where the magnet will be exposed to elevated temperaturesvMagnetic Property of Alnico
MAGNETIC CHARACTERISTICS OF CAST ALNICO
1.Isotropy

Br
Hcb
(BH)max
D
Tc
Tw
aBr
MMPAEquivalent
IECEquivalent
Grade
[mT]
[KAm]
[Kj/M3]
[g/m3]
[•C]
[•C]
[%•C]
[Gs]
[Oe]
[MGOe]
LN9
690
37
9.0
6.9
760
450
-0.03
Alnico3
Alnico9/3
6900
470
1.13
LN10
600
40
10.0
6.9
760
450
-0.03
Alnico3
Alnico9/3
6000
500
1.25
LN12
720
45
12.0
7.0
810
450
-0.03
Alnico3
Alnico12/6
7200
600
1.50
LN13
700
48
13.0
7.0
810
450
-0.03
Alnico3
Alnico12/6
7000
600
1.63
MAGNETIC CHARACTERISTICS OF CAST ALNICO

Br
Hcb
(BH)max
D
Tc
Tw
aBr
MMPAEquivalent
IECEquivalent
Grade
[mT]
[KAm]
[Kj/M3]
[g/m3]
[•C]
[•C]
[%•C]
[Gs]
[Oe]
[MGOe]
LN16
800
53
16.0
7.3
850
525
-0.02
[Alnico4]
/
8000
660
2.00
LN18
1050
46
30.0
7.3
850
525
-0.02
[Alnico4]
/
MAGNETIC CHARACTERISTICS OF CAST ALNICO
1.Isotropy

Br
Hcb
(BH)max
D
Tc
Tw
aBr
MMPAEquivalent
IECEquivalent
Grade
[mT]
[KAm]
[Kj/M3]
[g/m3]
[•C]
[•C]
[%•C]
[Gs]
[Oe]
[MGOe]
LNG32
1180
46
32.0
7.3
890
525
-0.02
[Alnico5]
/
11800
575
4.00
LNG34
1180
46
34.0
7.3
890
525
-0.02
[Alnico5]
/
11800
575
4.25
LNG37
1200
48
7.0
7.3
890
525
-0.02
Alnico5
Alnico37/5
12000
600
4.65
LNG40
1250
48
40.0
7.3
890
525
-0.02
Alnico5
/
LNG44
1250
52
44.0
7.3
890
525
-0.02
Alnico5
Alnico44/5
12500
650
45.0
LNG48
1250
52
48.0
7.3
890
525
-0.02
Alnico5DG
Alnico52/6
12500
650
6.00
LNG52
1300
56
52.0
7.3
890
525
-0.02
Alnico5DG
Alnico52/6
13000
700
6.50
LNG60
1350
56
60.0
7.3
890
525
-0.02
Alnico5~7
/
MAGNETIC CHARACTERISTICS OF CAST ALNICO
1.Isotropy

Br
Hcb
(BH)max
D
Tc
Tw
aBr
MMPAEquivalent
IECEquivalent
Grade
[mT]
[KAm]
[Kj/M3]
[g/m3]
[•C]
[•C]
[%•C]
[Gs]
[Oe]
[MGOe]
LNGT28
1050
56
28.0
7.3
860
525
-0.02
Alnico6
Alnico26/6
10500
700
3.50
LNGT18
580
90
18.0
7.3
860
550
-0.03
[Alnico7]
Alnico17/9
5800
1130
2.2
LNGT32
800
100
32.0
7.3
860
550
-0.03
Alnico8
Alnico38/11
8000
1250
4.0
LNGT34
800
104
34.0
7.3
860
550
-0.03
Alnico8
Alnico38/11
8000
1300
4.25
LNGT38
820
110
38.0
7.3
860
550
-0.03
Alnico8
Alnico38/11
8200
1380
4.75
LNGT44
880
120
44.0
7.3
860
550
-0.03
Alnico8
/
8800
1500
5.50
LNGT60
900
110
60.0
7.3
860
550
-0.03
Alnico9
Alnico11
9000
1380
7.50
LNGT72
1050
112
72.0
7.3
860
550
-0.03
Alnico9
/
10500
1410
9.00
LNGT82
1100
120
82.0
7.3
860
550
-0.03
Alnico9
/
11000
1500
10.25
LNGT36J
700
140
36.0
7.3
860
550
-0.03
Alnico8HC
Alnico36/15
Typical Physical Properties of Alnico
Curie Temperature(•C)
860
Maximum Operating Temperature(•C)
450-550
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(215-5000)
Temperature Coefficient of Br(%/•C)
-0.025~-0.02
Temperature Coefficient of Hc(%/•C)
+0.01~+0.03
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