(Al – Ni – Co)We produce and supply alnico magnets, which are fabricated from premium quality aluminium nickel, cobalt, copper iron and sometimes titanium at Star Trace. These can be either cast or sintered.
Cast AlnicoCast alnico melted and poured into a mold. Once solidified, the materials 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 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 tolerance and then magnetized.
Sintered AlnicoSintered alnico is made from a powdered mixture of ingredients that are pressed into a die under tools of pressure, sintered in a hydrogen atmosphere and then cooled either within a magnetic field or without anisotropic Vs Isotropic)
Attributes Of Cast & Sintered Alnico- Stable temperature, excellent for high heat applications
- Maximum working temperature 525°C - 550°C
- May be ground to size
- Does not lend itself to conventional machining (hard and brittle)
- High residual induction and energy product compared to ferrite material
- Low coercive force compared to ferrite and rare earth materials (more subject to demagnetization)
- Most common grades of Alnico are 5 and 8
Application Of Alnico MagnetsManetos, separators, sensors, electron tubes, traveling wave tubes, radar, holding magnets, coin acceptors, clutches and bearings, motors, distributors, relays, controls, generators, receivers, telephones, microphones, bell ringers, guitar pickups, loudspeakers, security systems cow magnets
Magnetizing & HandlingMagnetizing is done after the magnet has been machined to the correct tolerances. Car should be taken when handling alnico material since it is brittle and can chip or break if dropped on hard surface. Also, it has low resistance to demagnetization, it will lose power if it is stored improperly (poles repelling each other). For best results, store magnetized alnico pieces are attracting each other, or with a steel keeper.
MachiningAlnico is a very hard and brittle material, and does not lend itself to conventional machining. The
Star Trace employs experienced machinists and the proper equipment to grind alnico to its requirements.
FOR FURTHER DETAILS KINDLY MAIL TO: startrace@dataone.in