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What Are Neodymium Magnets?

Neodymium magnet, also known as NdFeB magnet, is a tetragonal crystal composed of neodymium, iron, and boron (Nd2Fe14B). In 1982, Masato Sagawa of Sumitomo Special Metals discovered neodymium fishing magnets, which have a magnetic energy product (BHmax) greater than samarium-cobalt magnets, and have a maximum magnetic energy product (BHmax) that is more than 10 times that of ferrite magnets, making it the material with the largest magnetic energy product in the world at that time.


Later, Sumitomo Special Metals developed successful powder metallurgy technology, and General Motors developed a melt spinning process for preparing neodymium iron boron magnets. Neodymium iron boron has excellent mechanical processing properties and can work at high temperatures up to 200℃. This magnetic material has stable performance and good cost-effectiveness, and is the most commonly used rare earth magnet, widely used in electronic products such as hard drives, smartphones, headphones, and tools powered by batteries.


Chemical composition of neodymium magnets


Wholesale neodymium magnets are permanent magnetic materials based on the intermetallic compound Nd2Fe14B, and their main components are rare earth elements neodymium (Nd), iron (Fe), and boron (B). Third-generation rare earth permanent magnets neodymium iron boron are the strongest permanent magnets in modern times.


The main raw materials for neodymium iron boron magnets are neodymium 29%-32.5%, iron 63.95%-68.65%, boron 1.1%-1.2%, dysprosium 0.6%-8%, niobium 0.3%-0.5%, aluminium 0.3%-0.5%, copper 0.05%-0.15%, and other elements.


Neodymium iron boron magnets are divided into sintered neodymium iron boron magnets and bonded neodymium iron boron magnets. Bonded neodymium fishing magnets have magnetic properties in all directions and are corrosion-resistant. Sintered neodymium iron boron is prone to corrosion and needs surface plating, usually with zinc, nickel, and nickel-copper-nickel. Sintered neodymium iron boron magnets are generally divided into axial magnetization and radial magnetization. Sintered neodymium iron boron 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?


  • Electroacoustic area: speakers, microphones, alarms, stage audio, car audio, etc.

  • Electronics and electrical appliances: permanent magnet mechanism vacuum circuit breaker, magnetic holding relay, watt-hour meter, water meter, sound level meter, reed switch, sensor, etc.

  • Motor field: VCM, CDDVD-ROM, generator, motor, servo motor, micro motor, vibration motor, etc.

  • Mechanical equipment: magnetic separator, magnetic separator, electromagnet, magnetic machinery, etc.

  • Medical care: MRI, medical equipment, magnetic therapy health products, magnetized fuel saver, etc.

  • Other industries: magnetized anti-waxing device, pipeline descaling device, magnetic fixture, automatic mahjong machine, magnetic lock, door and window magnet, stationery magnet, luggage magnet, leather magnet, toy magnet, tool magnet, handicraft gift packaging, etc.

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