Rare-Earth Magnets
The energy density of rare earth magnets is ten times greater than that of AlNiCo and ferrite magnets. This brings significant advantages in terms of application, e.g. in the reduction of magnetic volume or in systems and component assembly miniaturisation. The magnets are pressed in a magnetic field, sintered and then either cut or ground into final shape. These production methods preclude the manufacture of radial oriented segments and radial oriented rings.
The SmCo magnets provide exceptionally good corrosion resistance, a low temperature coefficient and a significantly higher operational temperature than for NdFeB materials. However, as the material is very brittle, it is important to exercise caution when working with these magnets.
Further improvements in NdFeB magnets have been achieved with regard to corrosion resistance. Certain qualities are already demonstrating an excellent corrosion resistance performance, and during a 7-day HAST test weight losses of less than 5mg/cm² were registered. Depending on application, we would however continue to recommend a surface coating, which it should be noted will reduce the magnetic properties according to the coating material applied. The data below are for non-coated magnets.
As for all magnetic materials, the maximum operational temperature depends on using the correct size of magnet (L/density ratio at the operating point on the W x H curve).
If available you have the possibility to download PDF's for the individual magnet types. You find the appropriate files while hovering over their names in the tables below. The PDF then opens in a new window.
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