|
Alnico
Alnico Magnet Material
*Download:
Catalogue of Alnico Magnets
 (1.42MB)
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 magnets 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 better 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.
• Suitable for small volume magnets with complex shape
• Compact crystal, high intensity
• Regular shape, precision size
• Even elements, stable performance
• Suitable for compound magnet
• Excellent temperature stability (temp. coefficient of Br
is the smallest among all of the other permanent magnets.
Tag: Fan shape Permanent Magnet. Alnico Fan magnet,
Motor magnets, Generator magnets. Alnico 8, LNGT40, Alnico 9,
LNGT48, LNGT72, Alnico 38/11
Magnetic Properties of Sintered Alnico
|
Grade |
Material
|
Max.
Energy Product |
Remanence
|
Coercive
Force |
Rev.
Temp. Coeff. |
Curie
Temp. |
Working
Temp. |
Density
|
| (BH)max
|
Br
|
Hc
|
Br
|
Hci
|
Tc
|
Tw
|
D
|
| MGOe
|
kJ/m3
|
kG
|
mT
|
Oe
|
kA/m
|
%/°C |
%/°C |
°C |
°C |
g/cm3
|
| LN9
|
Alnico
1 |
1.13
|
9.0
|
6.8
|
680
|
380
|
30
|
-0.03
|
-0.02
|
760
|
450
|
6.9
|
| LN10
|
1.20
|
10.0
|
6.0
|
600
|
500
|
40
|
-0.03
|
-0.02
|
760
|
450
|
6.9
|
LNG12
LNG13 |
Alnico
2 |
1.6
|
12.8
|
7.0
|
700
|
580
|
47
|
-0.03
|
-0.02
|
810
|
450
|
7.0
|
|
LNG34 LNG37 |
Alnico
5 |
5.0
|
40.0
|
12.5
|
1250
|
640
|
51
|
-0.02
|
+0.02
|
860
|
525
|
7.3
|
|
LNG40 LNG44 |
Alnico
5DG |
6.5
|
52.0
|
13.0
|
1300
|
680
|
55
|
-0.02
|
+0.02
|
860
|
525
|
7.3
|
| LNG52 |
Alnico
5-7 |
7.5
|
60.0
|
13.5
|
1350
|
740
|
59
|
-0.02
|
+0.02
|
860
|
525
|
7.3
|
| LNGT28
|
Alnico
6 |
3.5
|
28.0
|
10.0
|
1000
|
720
|
58
|
-0.02
|
+0.03
|
860
|
525
|
7.3
|
| LNGT36J
|
Alnico
8H |
4.50
|
36.0
|
7.0
|
700
|
1750
|
119
|
-0.025
|
+0.02
|
860
|
550
|
7.3
|
|
LNGT32 LNGT40 |
Alnico
8 |
4.0
5.0 |
32.0 40.0 |
8.0
8.0 |
800 800 |
1250 1380 |
124
|
-0.025
|
+0.02
|
860
|
550
|
7.3
|
| Alnico
8 |
6.0
|
48.0
|
9.0
|
900
|
1500
|
120
|
-0.025
|
+0.02
|
860
|
550
|
7.3
|
| Alnico
8 |
4.5
|
36.0
|
7.0
|
700
|
1880
|
151
|
-0.025
|
+0.02
|
860
|
550
|
7.3
|
|
LNGT60 LNGT72 |
Alnico
9 |
9.0
|
72.0
|
10.5
|
1050
|
1400
|
112
|
-0.025
|
+0.02
|
860
|
550
|
7.3
|
Magnetic Properties of Cast Alnico
| Grade |
Br |
bHc |
iHc |
(BH)max |
Density |
Tc |
Remark |
| KGs |
T |
KOe |
KA/m |
KOe |
KA/m |
MGOe |
KJ/m3 |
g/cm3 |
oC |
Isotropic |
| FLN8 |
5.2 |
0.52 |
0.5 |
40 |
0.54 |
43 |
1.0-1.25 |
8-10 |
6.8 |
760 |
| FLNG12 |
7.0 |
0.7 |
0.5 |
40 |
0.54 |
43 |
1.5-1.75 |
12-14 |
7.0 |
810 |
| FLNGT14 |
5.7 |
0.57 |
0.95 |
76 |
0.98 |
78 |
1.75-2.0 |
14-16 |
7.1 |
850 |
| FLNGT18 |
5.6 |
0.56 |
1.1 |
88 |
1.13 |
90 |
2.25-2.75 |
18-22 |
7.2 |
850 |
| FLNG28 |
10.5 |
1.05 |
0.58 |
46 |
0.59 |
47 |
3.5-4.15 |
28-33 |
7.2 |
850 |
Anisotropic |
| FLNG34 |
11.0 |
1.1 |
0.63 |
50 |
0.64 |
51 |
4.3-4.8 |
34-38 |
7.2 |
890 |
| FLNGT28 |
10.0 |
1.0 |
0.7 |
56 |
0.71 |
57 |
3.5-3.8 |
28-30 |
7.2 |
850 |
| FLNGT31 |
7.8 |
0.78 |
1.3 |
104 |
1.13 |
90 |
3.9-4.5 |
31-36 |
7.2 |
850 |
| FLNG33J |
6.5 |
0.65 |
1.7 |
135 |
1.88 |
150 |
4.15-4.5 |
33-36 |
7.2 |
850 |
| FLNGT38 |
8.0 |
0.8 |
1.55 |
123 |
1.58 |
126 |
4.75-5.3 |
38-42 |
7.2 |
850 |
| FLNGT42 |
8.8 |
0.88 |
1.5 |
120 |
1.53 |
122 |
5.3-6.0 |
42-48 |
7.25 |
850 |
« back to top
|
