Bonded NdFeB: The new favorite of high-performance magnet solutions

In today's rapidly changing science and technology, high-performance magnet materials are increasingly widely used in various fields. Bonded NdFeB, as a high-performance rare earth permanent magnet material, has emerged in many industries with its excellent magnetic properties and stable chemical properties, and has become the new favorite of high-performance magnet solutions.

Bonded NdFeB magnets are made by mixing rapidly quenched NdFeB magnetic powder with a binder and undergoing a series of processes. The preparation process of this magnet is relatively complicated, but the technology is mature and can be mass-produced. The preparation of magnetic powder is a key process in processing NdFeB permanent magnets. The current mainstream process uses the HDDR method, which is to prepare high-performance rare earth permanent magnet powder through the process of hydrogenation-decomposition-dehydrogenation-recombination. This method can obtain grains with a small average particle size, thereby obtaining magnetic powder with high coercivity.

The pressing molding process of bonded NdFeB mainly includes calendering molding, injection molding, extrusion molding, and compression molding. Among them, calendering molding is to mix the magnetic powder and the binder evenly in a certain volume ratio, roll them into the required thickness, and then cure them to make the finished product; injection molding is to mix the magnetic powder and the binder, heat and mix, granulate, dry, and then inject them into the mold cavity to form, and then cool them to get the finished product. These molding processes enable bonded NdFeB magnets to be formed in one go, with high dimensional accuracy and a large degree of freedom. The molding shape can be controlled by the mold to meet the needs of different application fields.

Although the magnetic properties of bonded NdFeB are slightly lower than those of sintered NdFeB, they have high stability and outstanding magnetic properties in isotropic bonded magnets. In addition, bonded NdFeB also has good corrosion resistance. Generally, the surface coating is mostly epoxy resin, which can adapt to various harsh environments. These characteristics make bonded NdFeB widely used in office automation equipment, electrical machinery, audio-visual equipment, instrumentation, small motors and metering machinery, mobile phones, and other fields. Especially in the computer field, bonded NdFeB magnets are widely used in hard disk drives, optical disk drives, and other components.

With the advancement of science and technology and the development of the industry, the application field of bonded NdFeB is still expanding. In the field of new energy vehicles, bonded NdFeB permanent magnet motors have become an important technical support for the development of electric cars due to their high efficiency and energy-saving characteristics. In the field of wind power generation, bonded NdFeB permanent magnet generators have the advantages of small size, lightweight, and high output power, and are key components of wind turbines. In addition, in the fields of medical equipment, aerospace, etc., the application of bonded NdFeB is also increasing, providing a strong driving force for the development of related industries.

My country is a major country in bonded NdFeB magnets, accounting for 70% of the world's total output, and is the world's largest bonded NdFeB production base. In recent years, with the country's emphasis on energy conservation and environmental protection and the rapid development of the new energy vehicle industry, the market demand for bonded NdFeB has continued to grow. It is expected that in the next few years, with the further development of new energy vehicles, wind power generation, and other fields, the market size of bonded NdFeB will further expand.

In short, bonded NdFeB, as a high-performance rare earth permanent magnet material, has been widely used in many industries with its excellent magnetic properties and stable chemical properties. With the continuous advancement of science and technology and the growing industry demand, the application areas of bonded NdFeB will continue to expand, providing more efficient and reliable magnet solutions for the development of related industries.