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Alnico Magnet
Alnico magnets, composed of primarily aluminum (Al), nickel (Ni), and cobalt (Co), were developed in the 1940s.
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Product Description
What is an Alnico Magnet?
Alnico magnets, composed of primarily aluminum (Al), nickel (Ni), and cobalt (Co), were developed in the
1940s.
This class of magnet remains a preferred material because of its excellent temperature stability, high
magnetic
flux density, and resistance to corrosion.
Alnico magnets are manufactured through a casting or sintering process. The casting process allows the
magnet to
be manufactured into intricate and complex shapes. Sintered Alnico is made from a powdered mixture of
ingredients that are pressed into a die under tons of pressure. The Sintering process allows for the magnets
to
be manufactured to tighter tolerances and higher mechanical strength.
Alnico Magnet Grades & Properties
| Grade |
Residual Induction Br(max) [Gs] |
Max Energy Product BH (max) MGOe |
Coercive Force Hcb Koe |
Curie Temp. [˚C] |
Temp. Coe of Br [%/˚C) |
Max. Practical Operating Temp. [˚C] |
|
|
Alnico 2 (Isotropic) |
7000 | 1.6 | 0.56 | 810 | -0.03 | 450 | QUOTE |
|
Alnico 3 (Isotropic) |
6000 | 1.2 | 0.48 | 810 | -0.03 | 450 | QUOTE |
|
Alnico 5 (Anisotropic) |
12500 | 5.5 | 0.64 | 860 | -0.02 | 525 | QUOTE |
|
Alnico 6 (Anisotropic) |
10000 | 3.5 | 0.78 | 860 | -.0.02 | 525 | QUOTE |
|
Alnico 8 (Anisotropic) |
8000 | 5.5 | 1.65 | 860 | -0.025 | 550 | QUOTE |
|
Alnico 9 (Anisotropic) |
10500 | 9.0 | 1.50 | 860 | -0.025 | 550 | QUOTE |
Br: Residual Induction
Gs: Gauss
Hc: Coercive Force
Oe: Oersted
˚C: Degree Celcius
MGOe: Mega Gauss Oersted
Standard Tolerances (inches);
Rod – Diameter (±0.002), Length (±0.005)
Rectangle – Length & Width (±0.01), Thickness (±0.005)
Ring – Outside Diameter (±0.002), Inside Diameter (±0.02), Thickness (±0.005)
Sintered Alnico Magnets
They have marginally lower magnetic properties, but better mechanical properties, than cast Alnico. Their fine grain structure results in highly uniform flux distributions and mechanical strength. So they are suited for applications requiring short magnets.
See the table below for grades and properties of cast Alnico magnets.
Sintered Alnico Magnet Grades & Properties
| Grade |
Residual Induction Br(max) [Gs] |
Max Energy Product BH (max) MGOe |
Coercive Force Hcb Koe |
Curie Temp. [˚C] |
Temp. Coe of Br [%/˚C) |
Max. Practical Operating Temp. [˚C] |
|
|
SAlnico 2 (Isotropic) |
7000 | 1.55 | 0.55 | 810 | 0.008 | 450 | QUOTE |
|
SAlnico 3 (Isotropic) |
5800 | 1.20 | 0.50 | 860 | 0.011 | 550 | QUOTE |
|
SAlnico 5 (Anisotropic) |
11000 | 4.25 | 0.62 | 890 | 0.009 | 525 | QUOTE |
|
SAlnico 6 (Anisotropic) |
10000 | 3.50 | 0.79 | 850 | 0.011 | 525 | QUOTE |
|
SAlnico 8 (Anisotropic) |
8800 | 5.25 | 1.50 | 850 | 0.011 | 550 | QUOTE |
|
SAlnico 8HC (Anisotropic) |
7000 | 4.13 | 1.80 | 860 | 0.011 | 550 | QUOTE |
Br: Residual Induction
Gs: Gauss
Hc: Coercive Force
Oe: Oersted
˚C: Degree Celcius
MGOe: Mega Gauss Oersted
Standard Tolerances (inches);
Rod – Diameter (±0.002), Length (±0.005)
Rectangle – Length & Width (±0.01), Thickness (±0.005)
Ring – Outside Diameter (±0.002), Inside Diameter (±0.02), Thickness (±0.005)
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