AlNiCo magnets are alloys of alluminium, nickel, cobalt, iron, copper and titanium. There are 2 production processes: casting and sintering, magnetization is possible only in axial direction.
AlNiCo magnets have high remanence, but low coercivity - this fact determines the magnetization direction. Optimal ratio of diameter and length of the magnet is 1:4. Magnetic field of AlNiCo magnets can be weaken by demagnetizing. AlNiCo is a hard material, machining is possible by grinding.
Working temparature is between -270°C and +500°C. AlNiCo magnets are resistant against acids and solvents.
Table of magnetic properties of AlNiCo magnets:
|Coercivity Hc (kA/m)||
Max. energy product
Max. working temp.
|Normal Hcb||Intrinsic Hci|
|AlNiCo 3||0.60||40||40||10||<= 500|
|AlNiCo 5||1.22||48||48||40||<= 500|
|AlNiCo 8||0.88||120||120||44||<= 500|
|AlNiCo 500||1.16||48||48||35||<= 450|
Other magnetic and mechanic parameters of AlNiCo magnets:
|Temp. coefficient of Br (%/°C)||Temp. coefficient of Hci (%/°C)||Magnetizing field (kA/m)||Curie temp. (°C)||Density (g/cm3)||Hardness (Hv)|
|- 0.03||> 800||860 - 890||7.1 - 7.3||550|