Grades Of Cast AlNiCo Magnets

Grades Of Sintered AlNiCo Magnets

Manufacturing method

AlNiCo magnets are produced by casting or sintering process, the magnetic properties and physical properties are slightly different.

Cast AlNiCo magnets are made from metal alloy melted and poured into a mold, after various heat-treated and cooled, a rough ground magnet with a dark gray color will be formed and solidified, then it can be machined and polished with a shiny appearance.

Sintered AlNiCo magnets are made from fine AlNiCo powder compacted into a die and pressed under tons of pressure, then sintered and cooled into a solid magnet in a hydrogen atmosphere.

Alnico magnets are hard and brittle, they are easily chipping and cracking, so special machining techniques and careful handling must be taken care when machine them.

Magnetizing & Surface treatment

There are anisotropic and isotropic materials of AlNiCo magnets, anisotropic magnets are treated and cooled in a magnetic field, then oriented with a preferred magnetic direction with maximum magnetic direction; isotropic magnet are not treated in a magnetic field, the magnets can be magnetized a all direction with same magnetic properties.

Alnico magnets are with excellent corrosion resistant, so surface coatings like NiCuNi, Zn are not necessary, they can be painted with color for educational or other purposes if required.

Applications

AlNiCo magnets are widely used for many applications especially which require high operating temperatures, the most common applications are electric motors, meters, guitar pickups, instrumentation, microphones, sensors, bearings, actuators, microwave devices, while also other applications like holding magnets, separators, magnetos, electron tubes, receivers, controls, relays, loudspeakers, security systems, cow magnets, radar, traveling wave tubes and more.