Application of various types of permanent magnets explain(1)

- Nov 10, 2017 -

(1) neodymium iron boron magnets(Ndfeb Magnet) and other permanent magnet materials than the magnetic properties of the advantages of sudden. It has a very high energy product, coercivity and energy density, known as "magnetic king", and its mechanical properties, easy processing. These excellent properties make NdFeB permanent magnet materials in modern industrial and electronic technology has been widely used, the more common permanent magnet motors, speakers, magnetic separator, computer disk drives, magnetic resonance imaging equipment and so on. In 2000 the output value of rare earth permanent magnet surpassed the ferrite for the first time in 2010, the output value of the super strong magnets surpassed that of the ferrite in 2010 to become the de facto "protagonist" in the permanent magnet industry. According to the manufacturing process, the NdFeB is divided into sinter and stick Knot and hot pressing three kinds of performance characteristics of the three magnets, making them also have their own characteristics in the application. Sintered NdFeB is the highest yield, the most widely used rare earth permanent magnet materials. Sintered Nd-Fe-B has high energy product, high coercivity and high working temperature, but its preparation tolerance is large, the shape of the freedom is small, so mainly used in large and medium-sized motors, wind turbines, high-fidelity speakers and so on. The following figure shows the sintered NdFeB application distribution.


Bonded NdFeB has irreplaceable applications. Plastic Bonded magnetic properties than sintered NdFeB, but with its simple technology, 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 NdFeB excellent performance but limited application. Compared with the sintered NdFeB, hot NdFeB performance in control accuracy, yield, high temperature, corrosion resistance and cost advantages. Hot NdFeB production is still small, far behind the bond and sintered NdFeB magnets.

Bonded NdFeB, sintered NdFeB and hot-pressed NdFeB have their own characteristics and applications. The overlapping scope of the downstream applications is not large, and they are more complementary to each other and not an alternative or crowding-out effect . First, the bonded NdFeB and sintered NdFeB greatly differ in performance, and the bonded NdFeB is mainly used in the field of various micro-sized motors while the sintered NdFeB is used in large and medium-sized motors in a large amount. The future development path of bonded NdFeB is likely to be in the low-end field to achieve the replacement of ferrite, rather than directly pose a threat to the market of sintered NdFeB. Second, the market size of hot-pressed NdFeB is still small, and the application of sintered NdFeB can not be significantly affected in the future for a long period of time. The cost and performance of hot pressing NdFeB is superior to that of sintered NdFeB and it is expected to replace sintered NdFeB in many fields such as automotive EPS, wind turbine, air conditioner compressor, etc. However, the hot forming NdFeB is limited at this stage, Can only be made into a ring, which greatly limits the scope of its application. Currently, hot NdFeB is mainly used in the field of automotive EPS motors.

Article from NdFeB Industry Network

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