The common material for powerful fixed magnet is sintered NdFeB, which is mostly used in room temperature working environment. But when the fasten magnet is used in high temperature environment, such as 250℃, then we need to choose high temperature resistant magnetic material, such as samarium cobalt, Alnico, alnico or ferrite, etc.
Among these three materials, samarium cobalt has the strongest magnetism. If you need smaller and stronger cup magnets, then samarium cobalt pot magnets are a better choice.
For example, we have a European customer who originally used a ferrite cup magnet in his workshop at high temperature. The size is about D50, the suction power is about 18kg. Later he wanted to change to a smaller and more compact pot magnet with more suction power. At the same time, the cup magnet need to withstand at least 250 degrees.
According to his requirement, we arranged the sample production of samarium cobalt cup magnet in the size of D28mm. Finally, tested by the standard suction force testing instrument, the maximum suction of the prototype can reach 21kg.