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.
‘U' MAGNET - TYPE A
‘U' MAGNET - TYPE B
RING MAGNET
HORSE SHOE MAGNET
CYLENDER MAGNET
BUTTON MAGNET
CYL - BAR MAGNET
POT MAGNET
RECTANGULAR MAGNET
SPECIAL EPM MAGNET
A second quadrant demagnetization curve provides information about the magnetic characteristics of a magnet, including the magnetic field strength and how resistant it is to demagnetize. How it is used in a magnetic circuit will affect its performance. When a permanent magnet is fully magnetized, its magnetic domains are aligned. Certain conditions such as temperature and reverse magnetic fields can cause some of the domains to lose this alignment and reverse, triggering the magnet to lose some or all of its magnetic field.
