High induction levels with good resistance to demagnetization and stability, due to its low temperature coefficient (0.02% / °C), at a reasonable cost made Alnico the magnet material of choice.
A high working temperature limit (550 °C / 1020 °F) makes Alnico especially well suited for sensitive automotive and aircraft sensor applications. Alnico is produced in many grades to fit the requirements of these applications, from Alnico 1 to Alnico 12, but the most popular grades are 2, 5 and 8. By comparison to newer materials, the coercivity of Alnico is low.
Alnico magnet material is made by alloying aluminum, nickel and cobalt with iron. Some grades also contain copper and/or titanium. The alloying process is casting or sintering. The process and the heat treatment needed to optimize magnetic properties produces hard (Rc45) and brittle parts that are best shaped or finished by abrasive grinding. Cast parts are generally under 70 pounds and may be used as-is, but polar surfaces are usually ground flat and parallel. Sintering is confined to high volume parts in sizes under one cubic inch and an effective press length to diameter ratio under four.
Physical Properties
|
Curie Temperature
|
760 - 860°C
|
Coefficient of Thermal Expansion
|
+11.0 - +13.0 x 10-6 °C-1
|
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Electrical Resistivity
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45 - 75 µΩ·cm
|
|
Density
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6.9 - 7.3 g·cm-3
|
|
Rockwell C Hardness
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45 - 55 HRC
|
|
Tensile Strength
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0.02 - 0.15 kN·mm-2
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Transverse Modulus of Rupture
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0.05 - 0.30 kN·mm-2
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Features
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Curie Temperature
|
810 - 860°C
|
Coefficient of Thermal Expansion
|
+11.0 - +12.4 x 10-6 °C-1
|
|
Electrical Resistivity
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50 - 70 µΩ·cm
|
|
Density
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6.8 - 7.0 g·cm-3
|
|
Rockwell C Hardness
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45 HRC
|
|
Tensile Strength
|
0.35 - 0.45 kN·mm-2
|
Transverse Modulus of Rupture
|
0.35 - 0.76 kN·mm-2
|
Supplier of fecrco magnets and alnico magnets. Supplies permanent magnet materials including Alnico, ceramic and flexible magnet supplies. Supplier of magnet powder, magnetic compound, flexible, alnico, ferrite, and rare-earth magnets.
Supplier of fecrco magnets and alnico magnets. Supplies permanent magnet materials including Alnico, ceramic and flexible magnet supplies. Supplier of magnet powder, magnetic compound, flexible, alnico, ferrite, and rare-earth magnets.
Supplies permanent magnet materials including Alnico, ceramic and flexible magnet supplies. Produce magnetic materials including NdFeB, Alnico, SmCo and permanent magnets. Manufacturer of alnico and ferrite permanent magnets. Also produces magnetic systems and assemblies.
Supplies permanent magnet materials including Alnico, ceramic and flexible magnet supplies. Produce magnetic materials including NdFeB, Alnico, SmCo and permanent magnets. Manufactures permanent magnets, including cast and sintered alnico, ceramic (Ferrite), samarium cobalt and neodymium-iron-boron magnets.
