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Note: Alnico magnets are inherently brittle, lock ductility; they should not be used for any structural components in design.
*All of the data shown above is compiled from industries and research sources and only should be use for reference only.
Unit Conversion: 1 mT=10 Gs, 1 kA/m=4Π Oe, 1kJ/m³=4Π x 10⁻²MGOe
Sintered Alnico magnets are produced using a powder metallurgy process and compacted into forming dies. The formed shapes are sintered at high temperature under hydrogen atmosphere. To optimize greater mechanical and magnetic properties heat treatment is used. In the final process, annealing is introduced which enhances magnetic properties, stabilizes the alloy structure and reduces the brittleness. With high operating temperatures of 1020 ⁰F/ 550⁰C alnico magnets are well suited for many applications especially when temperature is a critical point of operation. Alnico magnets are excellent choices for applications involving, high-speed switching and motion, vibration, shock, corrosion resistance, high mechanical properties and relatively low cost.
Alnico magnets can only be magnetized in the direction of orientation.
To produce Alnico magnets conventional methods are used: casting in resin bonded molds and a sintering process. Each process produces Isotropic and Anisotropic magnets. Isotropic Alnico magnets are produced with no orientation and without exposure to electromagnetic field and can be magnetized in any direction. On the other hand, the Anisotropic Alnico magnet castings are heated above their Curie temperature, and then cooled at a controlled temperature rate with an electromagnetic field applied in a specific direction to achieve the desired improved properties.
Alnico magnets as they are known consist of alloys: Al (aluminum) Ni (nickel) Co (cobalt), hence Al-ni-co, with additional alloys, iron, copper and titanium and other elements to enhance heat treatment in magnetic properties. They were developed in late 1930’s and commercially available in the early 1940’s. Some of the trade name alloys are: Alcomax, Alni, Arnox, Columax, Hycomax, and Lodex.