"King of Magnets" Nd2Fe14B
Nd2Fe14B permanent magnetic material is the third generation rare earth permanent magnetic material based on intermetallic compound Nd2Fe14B. Its main components are rare earth elements iron (63.9-68.7%), neodymium (29-32.5%) and boron (1.1-1.2%). The main production processes include smelting, powder making, molding orientation, sintering and machining. Under the environment of appropriate temperature and humidity and without strong external magnetic field, radiation and other factors affecting magnetic properties, Nd2Fe14B permanent magnetic materials will not cause great loss in their magnetic properties. They are the magnetic materials with the best magnetic properties and the best comprehensive performance in Nd2Fe14B modern times, which are conducive to realizing important functions such as electrical signal conversion and electrical mechanical energy transmission, and making electronic instruments, communication equipment, etc. gradually smaller and thinner, It is called the "king of magnets".
Magnetic materials refer to those materials that can directly or indirectly produce magnetism from transition elements such as iron, cobalt, nickel and their alloys. Magnetic materials can be divided into soft magnetic materials and hard magnetic materials according to the difficulty of demagnetization after magnetization, soft magnetic materials, permanent magnetic materials, rectangular magnetic materials, rotating magnetic materials and piezomagnetic materials according to the function, and sintered magnets and bonded magnets according to the production process.
The most important indexes of magnetic materials are the maximum magnetic energy product and coercivity. High magnetic energy product and high intrinsic coercivity represent that the magnetic materials required to achieve the same magnetic force are smaller in volume, lighter in weight, stronger in anti demagnetization ability and higher in use efficiency. The maximum magnetic energy product, coercive force and remanence mainly measure the magnetic properties of materials, and the higher the better. In addition, the maximum use temperature and Curie temperature are used to measure the temperature resistance characteristics of the magnet. The higher the maximum use temperature and Curie temperature of the magnet, the more stable the performance of the magnet.
Rare earth permanent magnet materials have been developed to the third generation of rare earth permanent magnet Nd2Fe14B. The rare earth permanent magnet materials can be divided into four generations according to their development order: after the aluminum nickel cobalt permanent magnet and ferrite permanent magnet materials, the first and second generations of rare earth permanent magnet materials SmCo5 and Sm2Co17 have come out successively. The third generation of rare earth permanent magnet is the Nd2Fe14B magnetic material successfully developed in the 1980s, while the fourth generation of rare earth permanent magnet represented by rare earth iron nitrogen and rare earth iron carbon is still in the development stage.
According to different manufacturing processes, Nd2Fe14B can be divided into bonded Nd2Fe14B, sintered Nd2Fe14B and hot pressed Nd2Fe14B . Among them, sintered Nd2Fe14B and hot pressed Nd2Fe14B are mainly characterized by excellent magnetic properties and good corrosion resistance; The advantage of bonded Nd2Fe14B is that it can be formed once, with accurate size, complex shape and high material utilization rate, but its magnetic properties are inferior to sintered Nd2Fe14B, so its application scope is limited; At present, the production process of hot pressed Nd2Fe14B is complex, the processing cost is high, and the price of raw materials even exceeds the price of finished products. Therefore, the current output is small, and no industry has been formed.
The upstream of the Nd2Fe14B permanent magnetic material industry chain is mainly the rare earth ore mining and rare earth smelting industries, the middle reaches are Nd2Fe14B producers, the downstream is traditional fields such as consumer electronics, basic industries, and new energy, energy conservation and environmental protection and other emerging applications
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--------Mr. Tae Lee Korea
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