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NdFeb Magnets Very High Magnetic Energy Product
Aug 31, 2017

NdFeb Magnets Very high magnetic energy product

Application of NdFeB and Sintered NdFeB

NdFeB NdFeB NdFeB magnets with other permanent magnetic materials compared to the advantages of magnetic performance. It has a very high magnetic energy product, coercivity and energy density, known as the "magnetic king", and its mechanical properties, and easy processing. These excellent properties make NdFeB permanent magnet materials in modern industry and electronic technology has been widely used, more common with permanent magnet motor, speakers, magnetic separator, computer disk drives, magnetic resonance imaging equipment and so on. In 2000, the output value of rare earth permanent magnet exceeded the ferrite for the first time. The output value of NdFeB magnets in 2010 also surpassed the ferrite completely. As the permanent protagonist of the permanent magnet industry, according to the manufacturing process, NdFeB is divided into sintered Knot and hot pressing three, three kinds of magnets have their own characteristics, so that they also have their own characteristics in the application. Sintered NdFeB is the highest yield, the most widely used rare earth permanent magnet materials. Sintered NdFeB has high magnetic energy product, high coercivity and high working temperature, but its preparation tolerance is large, the degree of freedom is small, so it is mainly used in large and medium-sized motors, wind turbines, high-fidelity speakers and so on. The following figure shows the application of sintered NdFeB distribution.

Bonded NdFeB has an irreplaceable application area. Bonded NdFeB magnetic properties as sintered NdFeB, but it has a simple process, low cost, small size, high precision, uniform and stable magnetic field, etc., in information technology, office automation, consumer electronics and other fields with irreplaceable status. The following figure shows the application of bonded NdFeB distribution.

Hot-rolled NdFeB excellent performance but limited application. Compared with sintered NdFeB, hot-pressing NdFeB performance in the control accuracy, yield, high temperature, corrosion resistance and cost advantages. At present, foreign countries are the United States GM, Japan Datong and Europe Delta three companies produce hot-pressing NdFeB, and domestic companies only Galaxy magnet to its development research. Hot-pressing NdFeB production is still small, far behind the bonding and sintering NdFeB magnets.

Bonded NdFeB, sintered NdFeB and hot-rolled NdFeB in the performance and application of the characteristics of the downstream application areas overlap is not large, more complementary to each other function is not an alternative or the role of crowding The First, the bonded NdFeB and sintered NdFeB in the performance of the difference between the large, bonded NdFeB is mainly applied to a variety of micro-size motor and sintered NdFeB large number of applications in large and medium-sized motor field. The future development trend of bonded NdFeB will be in the low-end areas to achieve the replacement of ferrite, rather than directly on the sintered NdFeB market poses a threat. Second, hot-pressing NdFeB market size is still small, the future for a long period of time can not be sintered NdFeB applications have a significant impact. Hot-rolled NdFeB cost and performance is better than sintered NdFeB, is expected in the automotive EPS, wind power motors, air conditioning compressors and other fields to replace sintered NdFeB, but hot-pressing NdFeB stage molding process is limited, Can only be made into a ring, which greatly limits its scope of application. At present, hot-pressing NdFeB is mainly used in the field of automotive EPS motor.

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