Alnico Magnet

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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