Cast AlNiCo Magnet
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Alnico is an alloy containing Aluminium (Al), Nickel (Ni), Cobalt (Co) hence its name Alnico. But Alnico actually contains more than just these three elements. It also contains Iron and Copper with some versions also containing Titanium and even Niobium (the Titanium versions were sometimes called Ticonal, derived from the elements TiCoNiAl). Alnico magnets were developed in the 1930`s and were the first [Real" performance Permanent Magnets (the first [magnets", called magnetic steels, were quickly replaced by the vastly superior Alnico).
Alnico is produced by either a sintering method or, more commonly, a casting method. The as cast or as sintered shape is acceptable for many applications but surfaces may need to be ground for a smoother surface finish. The as cast look has darkened edges with a slightly rough texture (due to the sand mold edges); a machined face of an Alnico Magnet has a bright silvery metallic surface and is usually extremely smooth as it is often precision ground.
Until about 1975, Alnico Magnets were the most widely used magnets in the world. The last 35 years have seen a sharp decline in the demand for them mainly because of the soaring prices of Cobalt and the availability of high coercivity materials like Ferrites and Rare Earths, the former being also the cheapest. And yet, Alnicos still play an important role in many applications because of their vastly superior ability to withstand high temperatures (up to 550°C) and a very low temperature co-efficient (less than 0.02% per degree C) as compared to Ferrite and Rare Earth Magnets.
Worldwide, Alnicos are produced in several grades, some isotropic (unoriented) and the others anisotropic (oriented). Of these, we produce Alnico-5 and Alnico-6 which are the most popular anisotropic grades and Alnico-3 which is isotropic and primarily used for Speedometer Magnets. We also produce Alnico-8 (isotropic), which is primarily used in powder form for making bonded magnets.
Alnico is produced by either a sintering method or, more commonly, a casting method. The as cast or as sintered shape is acceptable for many applications but surfaces may need to be ground for a smoother surface finish. The as cast look has darkened edges with a slightly rough texture (due to the sand mold edges); a machined face of an Alnico Magnet has a bright silvery metallic surface and is usually extremely smooth as it is often precision ground.
Until about 1975, Alnico Magnets were the most widely used magnets in the world. The last 35 years have seen a sharp decline in the demand for them mainly because of the soaring prices of Cobalt and the availability of high coercivity materials like Ferrites and Rare Earths, the former being also the cheapest. And yet, Alnicos still play an important role in many applications because of their vastly superior ability to withstand high temperatures (up to 550°C) and a very low temperature co-efficient (less than 0.02% per degree C) as compared to Ferrite and Rare Earth Magnets.
Worldwide, Alnicos are produced in several grades, some isotropic (unoriented) and the others anisotropic (oriented). Of these, we produce Alnico-5 and Alnico-6 which are the most popular anisotropic grades and Alnico-3 which is isotropic and primarily used for Speedometer Magnets. We also produce Alnico-8 (isotropic), which is primarily used in powder form for making bonded magnets.