The operating temperature of ordinary Nd-Fe-B magnets is 80℃-200℃, the upper limit of ordinary materials is 80℃, and the upper limit of high-temperature materials is 200℃. Within the operating temperature range, every 1 ° C rise, the corresponding magnetic force will weaken, and the magnetization of magnetic iron will quickly exceed the temperature upper limit. Therefore, when choosing Ndfeb permanent magnets, it must be clear what kind of material they buy and what their operating temperature is.
Relationship between Nd-Fe-B operating temperature and Curie temperature
The higher the Curie temperature, the higher the working temperature of the magnetic material, the better the temperature stability. The Curie temperature can be increased by adding cobalt, terbium and dysprosium into the sintered raw materials of neodymium, iron and boron.
The highest working temperature of sintered Nd-Fe-B depends on its own magnetic properties and the choice of working point, for the same sintered Nd-Fe-B magnet, the more closed the working magnetic circuit, the higher the maximum working temperature of the magnet, the more stable the performance of the magnet, so the maximum working temperature of the magnet is not a definite value, but changes with the closure of the magnetic circuit.