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Alnicos
are precipitation-hardened alloys requiring special heat treatment
techniques. The raw materials are cobalt, nickel, copper,
aluminum and iron. Titanium, silicon, etc. are added in certain
proportions. The raw materials in their purest form are melted
in medium frequency induction furnaces and castings are made
using conventional sand or shell moulds. The heat treatment
consists of heating the alloy in furnace to well above its
curie point, and holding it at that temperature for some time.
This is followed by controlled cooling after which the castings
are reheated and held for a long period at a temperature of
about 6000C. This ageing process increases the coercive force
and the energy product. Finally, the castings are ground to
obtain close dimensional tolerances whenever necessary and
inspected for physical and magnetic accuracy. |
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| PML range of manufacturing
includes all the below grades of AlNiCo. |
| We also have the
expertise in manufacturing of isotropic magnets. These types
of magnets have the unique property of exhibiting Multiple Poles. |
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| Cast Alnico
Materials - Physical and Mechanical Properties (Nominal values) |
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Materials |
Density
g/cm3
|
Hardness
Rockwell
C
|
Curie
Point
oC
|
Coefficient
of
thermal expansion
per oC x 10
|
Electrical
Resistivity
at 25 oC
M.CM
|
Specific
Heat
Cal/gm oC |
| Alni |
6.9 |
51 |
760 |
12 |
65 |
0.11 |
| Coalni |
7.0 |
52 |
700 |
12 |
62 |
0.11 |
| Alnico II |
7.2 |
53 |
810 |
12 |
60 |
0.11 |
| Coalnimax Spl. |
7.3 |
50 |
860 |
11.4 |
55 |
0.11 |
| Coercimax |
7.35 |
50 |
870 |
11.3 |
50 |
0.11 |
| Coercimax Spl. |
7.35 |
50 |
870 |
11.3 |
50 |
0.11 |
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| Cast Alnico
Materials - Magnetic Properties (Nominal values) |
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Materials |
Remnance
Br
Gauss
|
Coercivity
Hc
Oersted
|
Maximum
Energy
Product (BH)
max MGOe
|
Working
Point
Bd Hd
G O
|
Average
Recoil
Permeability
|
Minimum
Magnetising Force
Hs Oersted |
Reversible
Temp
Coefficient of Br
% /oC |
| ISOTROPIC |
|
|
|
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| Alni |
6200
- 6700 |
510
- 560 |
1.3
- 1.5 |
4000
350 |
4.3 |
3000 |
-
0.03 |
| Coalni |
6000
- 6500 |
580
- 630 |
1.3
- 1.5 |
4000
354 |
4.5 |
3000 |
-
0.03 |
| Alnico II |
6700
- 7500 |
600
- 670 |
1.5
- 1.8 |
4000
400 |
4.9 |
3000 |
-
0.03 |
| ANISOTROPIC |
|
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| Coalnimax Spl. |
12100
- 12900 |
615
- 665 |
5.0
- 5.8 |
10000
550 |
3.5 |
3000 |
-
0.02 |
| Coercimax |
11100
- 11900 |
690
- 730 |
4.3
- 5.1 |
8400
560 |
4.0 |
3000 |
-
0.02 |
| Coercimax Spl. |
11700
- 12300 |
630
- 690 |
5.0
- 5.8 |
9800
550 |
3.7 |
3000 |
-
0.02 |
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| Excellent temperature
stability, high residual induction, and relatively high energies
characterize AlNiCo material. They can be manufactured in number
of complex shapes such as horseshoes. |
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