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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
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51
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760
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12
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65
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0.11
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| Coalni |
7.0
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52
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700
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12
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62
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0.11
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| Alnico
II |
7.2
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53
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810
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12
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60
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0.11
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| Coalnimax
Spl. |
7.3
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50
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860
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11.4
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55
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0.11
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| Coercimax |
7.35
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50
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870
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11.3
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50
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0.11
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| Coercimax
Spl. |
7.35
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50
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870
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11.3
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50
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0.11
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| Cast
Alnico Materials - Magnetic Properties
(Nominal values) |
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Materials
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Remnance
Br
Gauss
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Coercivity
Hc
Oersted
|
Maximum
Energy
Product (BH)
max MGOe
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Working
Point
Bd Hd
G O
|
Average
Recoil
Permeability
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Minimum
Magnetising Force
Hs Oersted
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Reversible
Temp
Coefficient of Br
% /oC
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| ISOTROPIC |
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| Alni |
6200 - 6700
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510 - 560
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1.3 - 1.5
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4000 350
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4.3
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3000
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- 0.03
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| Coalni |
6000 - 6500
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580 - 630
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1.3 - 1.5
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4000 354
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4.5
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3000
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- 0.03
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| Alnico
II |
6700 - 7500
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600 - 670
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1.5 - 1.8
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4000 400
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4.9
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3000
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- 0.03
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| ANISOTROPIC |
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| Coalnimax
Spl. |
12100 - 12900
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615 - 665
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5.0 - 5.8
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10000 550
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3.5
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3000
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- 0.02
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| Coercimax |
11100 - 11900
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690 - 730
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4.3 - 5.1
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8400 560
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4.0
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3000
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- 0.02
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| Coercimax
Spl. |
11700 - 12300
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630 - 690
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5.0 - 5.8
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9800 550
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3.7
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3000
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- 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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PRODUCT
CATEGORIES
