Alnico are precipitation hardened alloys requiring special heat treatment techniques.The raw materials used are Cobalt, Nickel, Copper, Aluminum and Iron. Titanium, silicon,etc. are added in certain proportions.The raw materials in their purest form are melted in medium frequency induction furnaces and castings are made using conventional sand or shell mould.The heat treatment consists of heating the alloy in furnace to well above its curie-point, and holding it at that temperature for some time. This is followed by controlled cooling after which the castings are reheated and held for a long period at a temperature of about 600ᵒC. This ageing process increases the coercive force and the energy product. Finally, the castings are ground to obtain close dimensional tolerances whenever necessary and inspected for physical and magnetic accuracy.
PML range of manufacturing includes all the below grades of AlNiCo.
PML also specializes in manufacturing of isotropic magnets. These types of magnets have the unique property of exhibiting Multiple Poles.
Cast Alnico Materials - Physical and Mechanical Properties (Nominal values)
Cast Alnico Materials - Magnetic Properties (Nominal values)
Excellent temperature stability, high residual induction, and relatively high energies characterize AlNiCo material. They can be manufactured innumber of complex shapes such as horseshoes.