Magnetic Materials

Topics: Rare-earth magnet, Magnet, Loudspeaker Pages: 2 (564 words) Published: March 20, 2013
Research on Magnet materials
Alnico Magnets
Alnico magnet alloy is largely comprised of Aluminum, Iron, Cobalt and Nickel. Alnico is a moderately expensive magnet material because of the Cobalt and Nickel content. Alnico magnet alloy has high maximum operating temperature and a very good corrosion resistance. Some grades of Alnico alloy can operate upwards of 1000C. Magnets made with this alloy are available in a variety of grades and dimensions and they are usually cast. Alnico magnet material is an older technology and it has a rather low intensity magnetic field. Alnico magnet alloy is now mainly used in applications where the magnet will be exposed to elevated temperatures. •Rare Earth Magnets

Samarium Cobalt (SmCo) and Neodymium Iron Boron (NdFeB) are called Rare Earth because Neodymium and Samarium are found in the rare earth elements on the periodic table. Both Samarium Cobalt and Neodymium magnet alloys are powdered metals which are compacted in the presence of a strong magnetic field and are then sintered. •Neodymium Magnets (Rare Earth)

(NdFeB) Neodymium a rare earth magnetis made up of Neodymium Iron and Boron and is moderate in price. With poor corrosion resistance neodymium iron boron magnet is usually plated or coated .Neodymium magnets are offered in a range of operating temperatures depending on application (80°C to 200°C). Premium Neodymium magnetic materials is capable of operating above 120°C is expensive. Neodymium permanent magnets usually offer the best value when comparing price and performance. •Samarium Cobalt Magnets (Rare Earth)

Samarium Cobalt, another rare earth magnet, is made up of largely Cobalt and Samarium and it is the most expensive magnetic material. Most of the cost is due to the high Cobalt content and the brittle nature of the Samarium alloy. This permanent magnetic material offers high resistance to corrosion and it can withstand high operating temperatures, up to 350°C. Samarium Cobalt magnetic materials are...
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