The difference between neodymium magnets and samarium cobalt magnets

Rare earth permanent magnets are also known as permanent magnet materials with the highest comprehensive performance. It is 8 to 10 times higher than permanent magnet materials and 3 to 5 times higher than AlNiCo permanent magnet materials, so it is widely used. Samarium cobalt permanent magnets are magnetic materials composed of metal rare earth materials such as samarium and cobalt. Contains SmCo5 and Sm2Co17. Neodymium iron boron (Ne2Fe14B) is a tetragonal crystal composed of neodymium, iron and boron.

Before analyzing the properties of two rare earth permanent magnet materials, samarium cobalt (SMCo) and neodymium iron boron (NdFeB), we need to understand the following two definitions:

Maximum Magnetic Energy Product: The larger the magnetic energy product, the less magnetic material is required to produce the same effect. So the bigger the BH, the better

Maximum working temperature: When the temperature is higher than this value, the magnetic performance drops sharply and cannot work normally. Part of the magnetism can be restored when the temperature falls back to normal levels. It can be seen from the above performance data that samarium cobalt and neodymium iron boron, as the two most important series of rare earth permanent magnet materials, each have their own merits.

NdFeB has good magnetic properties, but its magnetic temperature stability is poor and is easily affected by temperature. Samarium Cobalt also has excellent magnetic energy and the best temperature characteristics. Compared with NdFeB, it can better adapt to high temperature environment. Although the price of samarium cobalt is relatively high, due to its good stability, it is more and more favored by air compressor manufacturers and well received by customers.