Rare Earth Permanent Magnet Material
Rare earth permanent magnet materials are a type of magnetic material composed of rare earth elements. As one of the important applications of rare earth elements, permanent magnet materials are widely used in electronic, electrical, mechanical, instruments, new energy power and other fields. As an indispensable component material in modern high-tech industry, it has attracted widespread attention and become a hot spot in the development of science and technology in recent years.
Strictly speaking, rare earth permanent magnet materials are divided into two categories: sintered permanent magnet materials and bonded permanent magnet materials. Sintered permanent magnet materials are mainly made of rare earth elements and iron, cobalt and other elements. Rare earth elements mainly include samarium (Sm), neodymium (Nd), praseodimium (Pr), dysprosium (Dy), gadolinium (Gd), terbium (Tb) and other elements. Common sintered hard magnetic alloys are SmCo and NdFeB alloys. The Bonded permanent magnet materials mainly use polymers as the matrix, which are mixed with rare earth elements like NdFeB, ferrite and other magnetic powder precursors.
Sintered rare earth permanent magnet materials have the advantages of high maximum energy product (up to 9.2MGOe) and easy mass production. Its magnetism is mainly represented by remanence (Br) and coercive force (Hcb). Although the remanence is relatively low and the temperature coefficient is relatively large, the development and application of rare earth cobalt materials has greatly changed the history of magnet development. Smco and NdFeB rare earth permanent magnet materials have become and will become the mainstream of permanent magnet materials.
The application of rare earth permanent magnet materials is mainly directed to the fields of aviation, aerospace and military industry. With the applications in communication, navigation, automation, electric power, new energy sources and other fields, rare earth permanent magnet materials are gradually being recognized and adopted by more and more countries and industrial circles. With the input of capital, technology, ideas and methods, gradually, the industry of rare earth permanent magnet materials is developing rapidly.
At present, the application of rare earth permanent magnet materials in the field of engineering and medical equipment is increasing. Rare earth permanent magnet materials are made into various sectors, such as cylindrical magnets, ring magnets, block magnets, disc magnets and so on, which can be used in medical instruments, energy apparatus, office supplies etc. In addition, rare earth permanent magnet materials are also widely used in motors, meters, detectors, household appliances, etc. In addition, magnetic levitation transport and high-tec h electronic products will have a wider space for rare earth permanent magnet material applications.
In summary, rare earth permanent magnet materials play an important role in modern technology and equipment. With the continuous progress of science and technology, more and more application fields will be opened up, and the application of rare earth permanent magnet materials will be more extensive.
