Neodymium magnet, also known as NdFeB magnet, is a permanent magnet with Nd2Fe14B tetragonal structure composed of an alloy of neodymium, iron and boron, and its main components are rare earth elements neodymium (Nd), iron (Fe) and boron (B). Neodymium is part of this material, known as "rare earth."
Rare earths get their name not because of their natural concentrations, but because of the difficulty in separating them from other materials that are linked by chemical bonds. So it can be said that neodymium magnets are not the cheapest, but their magnetic force is the most powerful, and this larger power can exist in a few centimeters of magnets.
With nickel, zinc or copper coating, neodymium magnets have excellent resistance to atmospheric media, and neodymium magnets are the strongest magnets on the market today, known as the king of magnets. They are highly magnetic, with a maximum energy product (BH) max greater than 10 times that of ferrite magnets. NdFeB has excellent machinability and operating temperature up to 200°C. Also, neodymium magnets are widely used in various industries due to their stable performance and good cost performance.
In modern products that require strong permanent magnets, neodymium magnets have replaced other types of magnets, and the applications of NdFeB magnets are as follows:
1. Electroacoustic field: speakers, receivers, microphones, sirens, stage audio, car audio, etc.
2. Electronic products: permanent magnet mechanism vacuum circuit breakers, magnetic latching relays, watt-hour meters, water meters, sound level meters, reed switches, sensors, etc.
3. Motor field: VCM, CDDVD-ROM, generator, motor, servo motor, micro motor, vibration motor, etc.
4. Mechanical equipment: magnetic separator, magnetic separator, magnetic crane, magnetic machinery, etc.
5. Medical and health care: nuclear magnetic resonance apparatus, medical equipment, magnetic therapy health care products, magnetized fuel saver, etc.
6. Other industries: anti-magnetization wax, pipe descaling agent, 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.
The NdFeB magnet was discovered by Masato Sato of Sumitomo Special Metals in Japan in 1982. The magnetic energy product (BH) max of the magnet was larger than that of the cobalt magnet, which was the material with the largest magnetic energy product in the world at that time. Later, Sumitomo Special Metals successfully developed powder metallurgy methods and successfully developed a melt-spinning process that enables the preparation of NdFeB magnets, which are currently the most powerful permanent magnets and the most commonly used rare earth magnets.
1. NdFeB permanent magnets have the advantages of extremely high magnetic energy product and coercivity, and high energy density.
2. NdFeB magnets have strong magnetic force and are currently the strongest magnetic materials, and they are widely used and cost-effective.
3. NdFeB magnets have good mechanical properties and can be easily processed into various shapes, including special-shaped magnets.
4. NdFeB magnets have high precision, and the tolerance can be controlled within ±0.02mm.