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What are the chemical composition and applications of neodymium magnets
Neodymium magnets, also known as neodymium iron boron magnets, are tetragonal crystals composed of neodymium, iron, and boron (Nd2Fe14B). In 1982, Masato Sagawa of Sumitomo Special Metals discovered neodymium magnets. The magnetic energy product (BHmax) of this magnet is greater than that of samarium. Cobalt magnets, whose magnetic energy product (BH) max is more than 10 times that of ferrite magnets, were the materials with the highest magnetic energy product in the world at that time.
Later, Sumitomo Special Metals successfully developed a powder metallurgy process, and General Motors successfully developed a melt spinning process that can prepare neodymium magnets. NdFeB has excellent machinability and working temperature up to 200℃. This magnet has stable performance and good cost performance. It is a commonly used rare earth magnet and is widely used in electronic products, such as hard drives, mobile phones, earphones, battery-powered tools, etc.
Chemical composition of neodymium magnets
NdFeB magnets are permanent magnet materials based on the intermetallic compound Nd2Fe14B. The main components are the rare earth elements neodymium (Nd), iron (Fe) and boron (B). The third-generation rare earth permanent magnet NdFeB is a contemporary magnet. powerful permanent magnets. Its main raw materials are neodymium 29%-32.5%, iron 63.95-68.65%, boron 1.1-1.2%, dysprosium 0.6-8%, niobium 0.3-0.5%, aluminum 0.3-0.5%, copper 0.05-0.15% and other elements. NdFeB magnets are divided into two types: sintered NdFeB magnets and bonded NdFeB magnets. Bonded NdFeB magnets are magnetic in all directions and are resistant to corrosion. Sintered NdFeB is easy to corrode, and the surface needs electroplating, generally zinc, nickel, nickel copper nickel, etc. Sintered NdFeB magnets are generally divided into axial magnetization and radial magnetization. Sintered NdFeB permanent magnets have excellent magnetic properties and are widely used in electronics, motors, medical equipment, toys, packaging, hardware machinery, aerospace and other fields.
What are the applications of neodymium magnets
1. Electro-acoustic field: speakers, microphones, alarms, stage audio, car audio, etc. 2. Electronic appliances: permanent magnet mechanism vacuum circuit breakers, magnetic latching relays, watt-hour meters, water meters, sound meters, reed switches, sensors, etc.
3. Motor field: VCM, CDDVD-ROM, generator, motor, servo motor, micro motor, vibration motor, etc.
4. Mechanical equipment: magnetic separation, magnetic separator, magnetic crane, magnetic machinery, etc.
5. Health care: nuclear magnetic resonance apparatus, medical equipment, magnetic therapy health care products, magnetized fuel saver, etc.
6. Other industries: magnetized wax inhibitor, pipe descaler, magnetic fixture, automatic mahjong machine, magnetic lock, door and window magnet, stationery magnet, luggage magnet, leather magnet, toy magnet, tool magnet, craft gift packaging, etc.