Neodymium magnet,AlNiCo maget, Smco magnet,Ferrite magnets, rubber magnets

cylinder Alnico magnet with plastic tube package

Alnico magnets are made primarily from aluminum, nickel, cobalt, copper, iron and sometimes titanium. The composition of alnico alloys is typically 8–12% Al, 15–26% Ni, 5–24% Co, up to 6% Cu, up to 1% Ti, and the balance is Fe. They can be either cast or sintered.

Cast alnico magnets is melted and 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 alnico 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.

Characters of Cast alnico magnets:

Magnetic Materials Density Maximum Energy Product BH (max) Residual Induction Br Coercive Force Hc Intrinsic Coercive Force Hc Normal Maximum Operating Temp. Curie Temp.
lbs/in g/cm MGO Gauss Oersteds Iersteds
Alnico 5 (cast) 0.264 7.3 5.5 12800 640 640 975 525 1580 860
Alnico 8 (cast) 0.262 7.3 5.3 8200 1650 1860 1020 550 1580 860
Alnico 5 (sintered) 0.250 6.9 3.9 10900 620 630 975 525 1580 860
Alnico 8 (sintered) 0.252 7.0 4.0 7400 1500 1690 1020 550 1580 860
Applications of cylinder Alnico magnet with plastic tube package
路Electron tubes
路Traveling wave tubes
路Holding magnets
路Clutches and bearings
路Bell ringers
路Cow magnets
路Educational products
Attributes of Alnico Magnet
路Very temperature stable, great for high heat
路Working temperature can reach 550-600 C
路Does not lend itself to conventional machining
(hard and brittle)
路High residual induction and energy product
compared to ceramic material
路Low coercive force compared to ceramic and rare
earth materials (more subject to demagnetization)
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