Rare Earth Elements

Rare Earth Compounds

Magnetic Materials

Non Ferrous Elements

Non Ferrous Metal Recycling

NdFeB Permanent Magnet Material

Rare earth permanent magnet material is a kind of magnetic material which is composed of samarium and neodymium mixed rare earth metal and transition metal (such as cobalt, iron, etc.), sintered by powder metallurgy and magnetized by magnetic field. Rare earth permanent magnets are divided into samarium cobalt (SmCo) permanent magnets and NdFeB (NdFeB) permanent magnets. Among them, the magnetic energy product of SmCo magnets is between 15--30MGOe, and the magnetic energy product of NdFeB magnets is between 27--50MGOe, which is known as the "permanent magnet king" and is the highest magnetic permanent magnet material.

Neodymium Magnets, also known as NdFeB, NIB, or Neo magnets, are the most widely-used type of rare-earth magnets. It is the most vital type of permanent magnet made from an alloy of Neodymium, Iron, and Boron with the Nd2Fe14B tetragonal crystalline structure. It has replaced other magnets in many applications in modern products that require strong and permanent magnets, such as motors in cordless tools, hard disk drives, and magnetic fasteners.

As one of the most important application fields of rare earth materials, NdFeb material is one of the important basic materials supporting the modern electronic information industry, and is closely related to people's lives. With the popularization of communication equipment such as computers, mobile phones, car phones and the rapid development of energy-saving vehicles, the world's demand for high-performance rare earth permanent magnet materials is growing rapidly.

Sintered NdFeb magnet is still the highest magnetic permanent magnet, and has long become aerospace, national defense, electronic communications, clean energy, transportation, mining machinery, medical care and household appliances and many other fields necessary functional materials. Representative applications include permanent magnet motors, magnetic separation devices, nuclear magnetic resonance imaging, hard disk drives, consumer electronics, and wind power.

Neodymium Magnet Surface Treatments

1. Painting, coating, or plating is generally recommended for NdFeB.

2. Neo magnets can also be plated using ion vacuum deposition (IVD) techniques. This specialty plating is very controllable for thickness and has excellent adhesion to the material.

3. Nickel, zinc, or tin plating provides good corrosion resistance for NdFeB magnets, though longer lead times or higher volumes may be required for these.

4. Organic coatings exhibit good corrosion resistance characteristics. It is successfully developed for NdFeB. For especially harsh environments, it may be advisable to use a combination of coating techniques or to encapsulate the material in a sealed housing.

Remarks

1. NdFeB powder is very fine, and if it is dry, it can ignite spontaneously. Special care must be taken while handling NdFeB powder.

2. NdFeB magnets are very powerful, and special care must be taken in handling these magnets to avoid injuries.

3. NdFeB magnets are susceptible to corrosion.

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