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SpinDistribute.com Article Directory

The following article was published in our article directory on June 18, 2014.
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Neodymium Magnets

Article Category: Arts and Crafts

Author Name: Nick Bugeja

Neodymium magnets are made out of iron, boron, and an alloy of neodymium. It is a permanent magnet classified as a rare earth magnet. It is the most commonly used type of rare earth magnet. It is the strongest type of permanent magnet that is widely available. It was Sumitomo Special Metals and General Motors in 1982 that discovered the Nd2Fe14B compound which forms the neodymium magnets.

The properties of permanent magnets are energy product, Curie temperature, coercivity, and remanence. Neodymium magnets have high marks on all of these properties save for the Curie temperature, which is low in these magnets. Also, this type of magnet is graded in accordance to its maximum energy product. Higher grades show stronger magnets and this can range from N35 to N52. The letter that follows the number designates the maximum operating temperatures, or the Curie temperature. This ranges from M, which is up to 100 degrees Celsius, up to EH, or 200 degrees Celsius,

Neodymium magnets are widely used and have replaced ferrite and alnico magnets in many fields. This is because of their great strength which allows for smaller, lighter magnets to be used. This type of magnet is used for a whole lot of things, including electric generators for wind turbines, electric motors, door locks, MRIs, and magnetic bearings, among others. Because of their strength, they have also been used where magnets weren't used before, like in magnetic building sets, jewelry clasps, and desk toys. It also paved the way for the introduction of magnetic resonance imaging, or MRI, which has been of great use in the medical field.

The great strength of neodymium magnets also has its drawbacks . The greater force that these magnets exert creates dangers that are not usually seen with the other types of magnets. Magnets that are even just larger than a few cubic centimetres are enough to cause potential harm. Body parts squeezed in between two magnets can cause broken bones. The reason behind this is that the force exerted by the two magnets is strong enough to break delicate material. There have also been known cases where some children accidentally swallowed a couple of magnets, causing a lot of internal damage. The magnetic fields produced can also potentially mess with mechanical and electronic devices; they can erase data from credit cards and floppy disks, for example.

There are two primary methods of manufacturing neodymium magnets, the sintered and the bonded magnet process. A sintered magnet is made by placing the raw materials in a furnace and melted, then cast into a mold and subsequently cooled to form ingots. These ingots are then crushed to tiny particles and go through a process of liquid-phase sintering wherein the powder is aligned magnetically into condensed blocks. Afterwards, the blocks are heat-treated and magnetized. Bonded magnets are made by taking a thin ribbon of NdFeB alloy and melt spinning it. The ribbon is then crushed, mixed with a polymer, and injection or compression molded into bonded magnets.

Keywords: rare earth magnets, neodymium magnets, disc magnets, n52 magnets

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