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Brief Introduction to Neodymium Magnet Materials

Posted on Oct 8, 2017

Armstrong Neodymium Magnets

The third generation of rare earth permanent magnet, Neodymium Iron Boron (Neodymium magnets), is the most powerful permanent magnet in modern magnets.

The highest Remanence (Br) of Neodymium magnet1 is 3.8 times that of ferrite magnet, 1.1 times of that of Aluminum Nickel cobalt magnet and 1.3 times of that of SmCo magnets.

The highest (BH)max value of Neodymium magnet is 14.8 times that of ferrite magnet, 6 times of that of Aluminum Nickel cobalt magnet and 1.7 times of that of SmCo magnets.

The highest intrinsic coercive force (Hci) of Neodymium magnets is 11 times that of a ferrite magnet , 17 times that of a nickel cobalt magnet and 1.4 times of that of SmCo magnets.

Nd-Fe-B rare earth permanent magnet (NdFeB) has high Remanence(Br), high coercive force (Hc) and high energy product (BH)max, high performance price ratio, easy to be processed. Devices utilizing Neodymium magnets have been widely used in aerospace, electronics, electro acoustic instruments, toys, medical technology and so on. A variety of products have been applied especially for high magnetic performance and miniaturization.

As the raw material of Neodymium magnet has high cost performance ratio, tremendous reserves of it, which is more than 10 times of that of Samarium Cobalt, so the price of Neodymium magnets is much lower than SmCo magnet. Compared with SmCo magnets and Alnico magnet, the mechanical properties of Neodymium magnets are good and so relatively easy for cutting, drilling and processing of complex shape. The disadvantage of Neodymium magnet is its poor temperature performance. High temperature could make Neodymium magnets a great loss in magnetic performance. Its maximum working temperature is low. 176°F (80 °C) is the highest the Neodymium magnet of N grade could work at, for example. With special process and added elements, Neodymium magnets of grade AH can work at up to 428°F (220 °C). As the materials of Neodymium magnets contain a lot of neodymium and iron, it is easy to corrosion which is the major weakness. Consequently, Neodymium magnets must be treated with surface coating with Nickel plated (Ni), zinc (Zn), gold (Au), chromium (Cr), epoxy resin (Epoxy), etc. Neodymium magnets are widely used in industry, aviation, aerospace, electronics, mechanical and electrical, instrumentation, medical and other fields.