Attributes Of Neodymium Disc Magnet Ceramic Material

　　What is a permanent magnet?

　　A permanent magnet is an object made from a material that is magnetic and creates its own persistent Neodymium Disc Magnet factory. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door.

　　Permanent Magnets Materials

　　AlNiCo

　　Ceramic

　　SAMARIUM COBALT

　　NEODYMIUM

　　Some of the shapes of permanent magnets come in:

　　Ring Magnets

　　Bar Magnets

　　Disc Magnets

　　Cylinder Magnets

　　Cube Magnets

　　Magnetic Balls

　　Block Magnets

　　Horseshoe Magnets

　　Pyramid Magnets

　　Rod Magnets

　　Wedge Magnets

　　Alnico Magnets Characteristics

　　Excellent temperature stability, high residual induction, and relatively high energies characterize Alnico materials, composed primarily of alloys of Aluminum, Nickel, and Cobalt. They are manufactured through either a casting or sintering process. Cast magnets may be manufactured in complex shapes, such as horseshoes, not possible with other magnet materials. Sintered Alnicos offer slightly lower magnetic properties but better mechanical characteristics than cast Alnicos.

　　Alnico is hard and brittle. Machining or drilling cannot therefore be accomplished by ordinary methods. Holes are usually cored in at the foundry, and magnets are cast close to final size and then finish machined to closer tolerances.

　　Alnico has a low coercive force, and is easily demagnetized if not handled with care. For optimum performance of Alnico 5, the magnetic length should be approximately 5 er magnet should be about 1.250" long. Because of its higher coercivity, Alnico 8 may be used in shorter lengths and in disc shapes.

　　Ceramic Magnets

　　Attributes of Ceramic Material

　　High intrinsic coercive force

　　Tooling is expensive

　　Least expensive material compared to alnico and rare earth magnets

　　Limited to simple shapes due to manufacturing process

　　Lower service temperature than alnico, greater than rare earth

　　Finishing requires diamond cutting or grinding wheel

　　Lower energy product than alnico and rare earth magnets

　　Most common grades of ceramic are 1, 5 and 8 (1-8 possible)

　　Grade 8 is the strongest ceramic material available

　　Applications of Ceramic Magnets

　　Speaker magnets

　　DC brushless motors

　　Magnetic Resonance Imaging (MRI)

　　Magnetos used on lawnmowers and outboard motors

　　DC permanent magnet motors (used in cars)

　　Separators (separate ferrous material from non-ferrous)

　　Used in magnetic assemblies designed for lifting, holding, retrieving and separating

　　Rare Earth Magnets (Samarium Cobalt & Neodymium)

　　Collectively known as Rare Earth magnets, Samarium Cobalt (SmCo) and Neodymium Iron Boron (NdFeB) magnets are alloys of the Lanthanide group of elements. Rare Earth magnets are the most advanced commercialized permanent magnet materials today. SmCo magnets are available in a number of different grades that span a wide range of properties and application requirements. SmCo magnets are brittle and machining operations should be performed prior to magnetization, using diamond tools. We are equipped to fabricate these materials to blueprint specifications.

　　Samarium Cobalt

　　Attributes of Samarium Cobalt Material Applications of Samarium Cobalt Magnets

　　Computer disc drives High resistance to demagnetization

　　High energy (magnetic strength is strong for its size)

　　Good temperature stability

　　Expensive material (cobalt is market price sensitive)

　　Computer rigid disc drives, printers and speakers

　　Neodymium Magnets

　　Neodymium magnets (Nd-Fe-B) are composed of neodymium, iron, boron and a few transition metals. These magnets are extremely strong for their small size, metallic in appearance and found in simple shapes such as rings, blocks and discs.

　　Attributes of Neodymium Material

　　Very high resistance to demagnetization

　　High energy for size

　　Good in ambient temperature

　　Low working temperature for heat applications, but higher levels of heat resistance materials are being introduced periodically

　　Sensors

　　Traveling wave tubes

　　Linear actuators

　　Satellite systems

　　Motors where temporary stability is vital

　　Samarium cobalt magnets SmCo) are composed of samarium, cobalt and iron.

　　Samarium Cobalt