 | Star Trace is one of the leading Manufacturers and Suppliers of Alnico Magnets, which are produced primarily from aluminum, nickel, cobalt, copper, iron and sometimes titanium. These Alnico Magnets can be either cast or sintered. A comprehensive range of Powerful Alnico Plug Magnets manufactured by us are sent for quality test to ensure remarkable performance of Alnico Bar Magnets and satisfaction of customers. These high quality Alnico Magnets are available at market leading prices.
Cast Alnico
Cast Alnico melted 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 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.
Sintered Alnico
Sintered Alnico Magnets are made from a powdered mixture of ingredients that are pressed into a die under tons of pressure, sintered in a hydrogen atmosphere and then cooled either within a magnetic field or without (anisotropic Vs Isotropic).
Attributes of both Cast and Sintered Alnico
Very temperature stable, great 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
Applications
Application of Alnico Bar Magnet is in Manetos, 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 and Handling
Magnetizing is done after the magnet has been machined to the correct tolerances. Care should be taken when handling Alnico material as it is brittle and chip or break if dropped on a hard surface. Also, because it has a low resistance to demagnetization, it will lose power if it is stored improperly (poles repelling each other). For best results, store magnetized Alnico so that pieces are attracting each other, or with a steel keeper.
Machining
Alnico is a very hard and brittle material and does not lend itself to conventional machining. The company employs experienced machinists and the proper equipment to grind alnico to its require.
Typical magnetic and Physical Properties of Alnico Magnet Material
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