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Alnico magnets
are formed through a casting or sintering process and are composed
primarily of Aluminum, Nickel, Cobalt and Iron. Lower grades are unoriented
or isotropic with
relatively low magnetic output. Higher grades are anisotropic and have
higher magnetic
output in a specific direction. Alnico magnets can be found in sensing
devices, loudspeakers,
magnetos, motors, meters and holding devices.
Characteristics
* Strong resistance to
corrosion.
* Easy to magnetize and
calibrate after assembly.
* Sintered alnico has
excellent mechanical properties for complex shapes.
* Modest energy products,
but low coercive force.
* Excellent stability
over a broad range of temperatures.
Properties
|
Type |
Remanence | Coercive
Force |
Intrinsic
Coercive Force |
Product |
Recoil
Permeability |
Density | Remarks | |
|
(Gs) |
|
|
(BH)max (MGOe) |
|
g/cm3 | |||
| Minimum | Typical Value | |||||||
| LN9 | 6800 | 380 | 400 | 1.13 | 6.0~7.0 | 6.9 |
Equal
|
Isotropic |
| LN10 | 6000 | 500 | 540 | 1.20 | 4.5~5.5 | 6.9 | ||
|
|
7000 | 500 | 540 | 1.50 | 6.0~7.0 | 7.0 | ||
|
|
7800 | 650 | 680 | 2.00 | 5.0~6.0 | 7.0 |
Anisotropic
|
|
|
|
12000 | 550 | 560 | 4.30 | 4.0~5.0 | 7.3 | ||
|
|
12000 | 600 | 610 | 4.63 | 3.0~4.5 | 7.3 | ||
|
|
12500 | 600 | 610 | 5.00 | 2.5~4.0 | 7.3 | Half
Post Crystal |
|
|
|
12500 | 650 | 660 | 5.50 | 2.5~4.0 | 7.3 | ||
|
|
13000 | 700 | 710 | 6.50 | 1.5~3.0 | 7.3 | Post Crystal | |
|
|
10000 | 720 | 740 | 3.50 | 3.5~5.5 | 7.3 | Equal
Axis Crystal |
|
|
|
8000 | 1250 | 1280 | 4.00 | 2.0~3.0 | 7.3 | ||
|
|
8000 | 1380 | 1400 | 4.75 | 1.5~2.5 | 7.3 | ||
|
|
9000 | 1380 | 1400 | 7.50 | 1.5~2.5 | 7.3 | Post
Crystal |
|
|
|
10500 | 1400 | 1430 | 9.00 | 1.5~2.5 | 7.3 | ||
|
|
7000 | 1750 | 1850 | 4.50 | 1.5~2.5 | 7.3 | Equal
Axis
Crystal |
|
|
|
5200 | 500 | 540 | 1.00 | 4.5~5.5 | 6.7 | Isotropic | |
|
|
7000 | 500 | 540 | 1.50 | 6.0~7.0 | 7.0 | ||
|
|
10500 | 580 | 590 | 3.50 | 4.0~5.0 | 7.0 |
|
|
|
|
11200 | 590 | 600 | 4.25 | 3.0~4.5 | 7.0 | ||
|
|
7600 | 1340 | 1390 | 3.90 | 2.0~4.0 | 7.0 | ||
|
|
6500 | 1700 | 1880 | 4.15 | 1.5~3.5 | 7.0 | ||