Neodymium Magnet


Sintered Neodymium Iron Boron (NdFeB) magnet
Sintered Neodymium Iron Boron (NdFeB), or “neo” magnets, is the third generation of permanent magnet developed in the 1980s. It offers the strongest magnetic power today. With its excellent magnetic characteristics Neodymium Magnet offers flexibility for new designs or is replacing older materials like Alnico and Ceramic in many applications, including high performance motors, brushless DC motors, magnetic separation, magnetic resonance imaging, sensors and loud speakers.

Why choose Neodymium Magnet
A powder metallurgy process is used in producing sintered Neodymium magnets. Although sintered Neodymium magnet is mechanically stronger than Samarium Cobalt magnets and less brittle than other magnets, it should not be used as a structural component. Selection of sintered Neodymium magnet is limited by temperature due to its irreversible loss and moderately high reversible temperature coefficient of Br and Hcj. The maximum application temperature is 200 °C for high coercivity grades. Neodymium magnet is more prone to oxidation than any other magnet alloys. If Neodymium magnet is to be exposed to humidity, chemically aggressive media such as acids, alkaline solutions salts and harmful gases, coating is recommended. It is not recommended in a hydrogen atmosphere.

Neodymium magnet has poor resistance to corrosion and they can also corrode from the inside-out if proper pre-treatment processes are not followed. Oftentimes, multi-layer Nickel-Copper-Nickel plating is applied to prevent failure from corrosion, but this preventative technique may not be sufficient for all applications.

High Anti-corrosion and Low Weight Loss Neodymium Magnet
There are two main standards of low weight loss test as follows:

  • USA PCT: 121±1℃, 2 atm, 95% RH, 96 hours, weight loss less than 5~10mg/cm2
  • Europe HAST: 130±2℃, 3 atm, 95% RH, 168 hours, weight loss less than 2~5mg/cm2

Due to special material formulation and manufacturing process, the corrosion resistance is so excellent that neodymium magnet can reach the strict testing requirements above.

Application of Neodymium Magnet
Actuators, Brushless Motors, Converters Instruments & Meters, Jewelry Magnet Clasps, Loudspeakers, M.R.I.’s, Magnetic Bearings, Magnetic Chucks, Magnetic Selectors, Magnetic Separators, Magnetic Tooling, Medical Equipment, Microphones, Name Tag Badge Fasteners, Pick up tools, Receivers, Sensors, Relays, Reed Switches. Servo Motors, Stepping Motors

High Temperature Stability Neodymium Magnet
With higher Hcj value, this neodymium magnet is more stable during high temperature. The tests show that the maximum permanent loss after aging is 5%.