Alnico Magnets (Aluminium-Nickel-Cobalt Magnets)
 

Alnico magnets are made primarily from aluminum, nickel, cobalt, copper, iron and sometimes titanium. They can be either cast or sintered.

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Cast Alnico
Cast alnico is melted and poured into a mold. Once solidified, the material is rough ground and then heat-treated and cooled, sometimes in a magnetic field. When treated in the presence of a magnetic field, the magnet is called anisotropic. This orients the material to take on maximum magnetization and allows a higher gauss level. A cast magnet that is not heat-treated in a magnetic field is called isotropic. After heat treatment and cooling, the material can be ground to specific tolerances and then magnetized.

Sintered Alnico
Sintered alnico is made from a powdered mixture of ingredients that are pressed into a die under tons of pressure, sintered in a hydrogen atmosphere and then cooled either within a magnetic field or without (anisotropic vs. isotropic).

Alnico magnets have applications in the following areas:

• Electric motors

• Electric guitar pickups

• Microphones

• Sensors

• Loudspeakers

• Cow magnets

• Automotive and electronic sensors

• Actuators

• Hall effect sensors

• Magnetron

• Reed switches

• TWT amplifiers

• Communication

Custom-made Alnico Magnets for your applications:

• Courteous engineering assistance

• Prompt sample manufacturing

• We meet any feasible properties required by your project

Selectable sizes:

 

Block Magnet	Lenght (mm)	Width (mm)	Thickness (mm)
Maximum	100	80	50
Minimum	2	2	2
Tolerance	±0.01	±0.01	±0.01

 

Disc Magnet	Diameter (mm)	Thickness (mm)
Maximum	100	100
Minimum	2	2
Tolerance	±0.01	±0.01

Segment & other irregular shapes can be manfactured according to customer's sample or drawing/blue print

See Full Magnetic Properties Table of Alnico Magnets
 

Sintered Alnico Magnets	Casted Cylinder Magnets
Casted Block Magnets	Casted Horseshoe Magnets

Magnetic Properties of Alnico Magnets

Magnetic Properties of Sintered Alnico

Properties and Applications

The most efficient use of Alnico requires that it be magnetized after the magnet has been assembled with its pole pieces into the final magnetic circuit.

Magnetic saturation at the end-use location requires the application of a magnetizing force 4 to 5 times greater than the coercive force of the material. For Alnico 5, a magnetizing force of 3000 oersteds (240 KA/m) is recommended. For Alnico 8, the magnetizing force should be at least 7000 oersteds (560 KA/m).

Alnico magnets offer excellent stability with respect to temperature changes: reversible change is 0.02% per degree Centigrade. Heating may produce an irreversible loss of magnet strength. The magnitude of loss depends upon the dimensions of the magnet and its composition, but is usually less than 5%, and may be recovered by remagnetization. At temperatures exceeding 1000^oF (538^oC), a metallurgical change takes place which causes magnetic strength to reduce rapidly. This change will not be recovered by remagnetization.

External magnetic fields can also induce partial demagnetization. In some critical applications, it is desirable to stabilize the magnet by intentionally reducing magnetic output by 5% to 10%. Such stabilization may reduce, or even eliminate, the effect of stray external fields.

Fast-quote
sales@bbautomacao.com
to receive a quotation within 48 hours!

Alnico magnets are made primarily from aluminum, nickel, cobalt, copper, iron and sometimes titanium. They can be either cast or sintered.

Cast Alnico
Cast alnico is melted and poured into a mold. Once solidified, the material is rough ground and then heat-treated and cooled, sometimes in a magnetic field. When treated in the presence of a magnetic field, the magnet is called anisotropic. This orients the material to take on maximum magnetization and allows a higher gauss level. A cast magnet that is not heat-treated in a magnetic field is called isotropic. After heat treatment and cooling, the material can be ground to specific tolerances and then magnetized.

Alnico magnets have applications in the following areas:

• Electric motors
• Electric guitar pickups
• Microphones
• Sensors
• Loudspeakers
• Cow magnets
• Automotive and electronic sensors
• Actuators
• Hall effect sensors
• Magnetron
• Reed switches
• TWT amplifiers
• Communication

The most efficient use of Alnico requires that it be magnetized after the magnet has been assembled with its pole pieces into the final magnetic circuit.

Magnetic saturation at the end-use location requires the application of a magnetizing force 4 to 5 times greater than the coercive force of the material. For Alnico 5, a magnetizing force of 3000 oersteds (240 KA/m) is recommended. For Alnico 8, the magnetizing force should be at least 7000 oersteds (560 KA/m).

Alnico magnets offer excellent stability with respect to temperature changes: reversible change is 0.02% per degree Centigrade. Heating may produce an irreversible loss of magnet strength. The magnitude of loss depends upon the dimensions of the magnet and its composition, but is usually less than 5%, and may be recovered by remagnetization. At temperatures exceeding 1000^oF (538^oC), a metallurgical change takes place which causes magnetic strength to reduce rapidly. This change will not be recovered by remagnetization.

External magnetic fields can also induce partial demagnetization. In some critical applications, it is desirable to stabilize the magnet by intentionally reducing magnetic output by 5% to 10%. Such stabilization may reduce, or even eliminate, the effect of stray external fields.