Sintered AlNiCo-magnets

The main raw materials used for AlNiCo-magnets are iron, aluminum (~9%), nickel (~13%) and cobalt (~24%). In addition, various other elements are added. One differentiates between two different manufacturing procedures: pouring or sintering.
The following steps are used: Raw material assembly- mixing - melting - pouring - thermal treatment - testing - surface treatment - magnetization - final inspection. The finished magnet is very hard and can be further processed only using diamond tools or the erosion process. AlNiCo-magnets are characterised by high corrosion resistance. AlNiCo-magnets have a very low (negative) temperature coefficient and can thus be used for temperatures ranging from -250 to +500°C. Depending on the alloy, the remanence of AlNiCo -magnets ranges from approximately 0.70 - 1.2 Tesla. The remanence is thus comparable to that of NdFeB-magnets. However, the coercive field strength of 50 - 150 kA/m is approximately 10 times smaller than that of NdFeB-magnets. AlNiCo-magnets are also available as plastic-bound magnets.

Chemical characteristic data of Sintered AlNiCo-magnets