Neodymium Magnet, Little Known but Fully Applied in Our Lives!

Posted by admin | Posted in Car Insurance Minnesota | Posted on 25-05-2010

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Most people have no idea of what neodymium magnets are, though the materials are widely used in so many fields.

This is to introduce the magic Magnets in brief, help you know what this amazing materials are.

Neodymium magnets (Nd2Fe14B or Neo magnets) are the most powerful permanent magnets so far till now, being regarded as the king in the rare-earth magnet world.

Neodymium magnets can be manufactured in 2 principal routes as below,

- The classical powder metallurgy
- Bonded magnet process

Application of Neodymium Magnet

Neodymium magnets have already replaced Alnico and ferrite magnets in many of the myriad applications in modern technology where strong rare-earth magnets are necessarily needed, due to the fact that the greater strength allows the use of smaller, lighter magnets.

Here’s a list of samples,

- loudspeakers and headphones, permanent magnet motors
- magnetic guitar pickups, head actuators for computer hard disks
- magnetic resonance imaging (MRI), magnetic bearings and couplings
- lifting and compressor motors, synchronous motors
- cordless tools, servo motors
- electrical power steering, spindle and stepper motors

In addition, the greater strength of neodymium magnets inspired a few new applications in areas where magnets weren’t applied before, like children’s magnetic building sets, magnetic jewelry clasps.

Nowadays, neodymium magnets are under a very fast development and wide application.

Neodymium magnet can be produced in various shapes, as disc magnets, ring magnets, rectangle magnets, arc magnets, and some other special shaped magnets. A variety of different coating suited to the environments of the neodymium magnet, like nickel, zinc, epoxy, tin, chrome, silver, gold can also be offered according to its application.

At present, N52 Neodymium magnets can be manufactured in vast quantity in China, which is already closed to the top neodymium magnets that made by Japan or USA last century.

On other side of sintered NdFeB, bonded neodymium magnet is generally low in properties due to the special process of gluing the powder in a mold. Although bonded neodymium magnet does not possess magnetic properties as advanced as those of sintered neodymium magnets, the material can be made in shapes and sizes that are difficult to achieve with sintering.

Neodymium magnets are brittle (though not as brittle as the SmCo types). All Neodymium magnets, except the bonded NdFeB magnets are anisotropic, and can only be magnetized in the orientation direction. Bonded NdFeB magnet is isotropic and can be magnetized in any direction, and with multiple poles, although special magnetizing fixtures are required.

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