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Rare Earth Magnet

Star Trace specializes in providing strong high-quality Rare Earth Neodymium Magnet with a wide range of shapes and sizes. We are also one of the leading manufacturers and suppliers of the best quality Alnico Magnet, Ferrite Magnet, Rare Earth Neodymium Magnet, Samarium Cobalt Magnet.

 


Rare Earth Magnet

Rare Earth Magnet Neodymium Iron Boron (Ndfeb)
Neodymium magnet (Nd-Fe-B) is composed of neodymium, Iron, Boron and a few transition metals. Samarium Cobalt magnet (SmCo) is composed of samarium, cobalt and iron. These rare earth magnet is extremely strong for their small size, metallic in appearance and found in such simple shapes as rings, blocks and discs.

Manufacturing Rare Earth Magnet
In general, the elements are melted together and milled into a power that is dry-pressed to shape in the presence of a magnetic field. The material is then inte-red, aged, ground to dimension, magnetizem and tested. They are called "rare earth" magnet because the elements of neodymium and samarium are classified as such in the lanthanides section of the Periodic Table of the Elements.

Neodymium
Attributes

Application
Magnetic separator, linear actuators, microphone assemblies, servo motors, DC motors (automotive starters), Computer rigid disc drives, hammer bank printers, and speakers.

Samarium
Attributes

Applications

Rare Earth Tolerances


For as pressed material, tolerance on the thickness (direction of magnetization) is +/- .127mm. Other Dimensions are +/- 2.5% or +/-.254mm, which ever is greater. According to Magnet Materials Producers Association (MMPA) standards, visual imperfections such as hairline cracks, porosity and minor chips are commonly found in sintered metallic magnets. A chipped edge is considered acceptable if no more than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more then 50% of of pole surface.

Rare Earth Magnetizing and Handling

Rare earth magnet are very brittle and very strong magnetically. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnet. Fingers can be severely pinched between attracting magnet. Magnet can be chip if allowed to "Jump at" an attracting object. It is highly recommended that when constructing rare earth magnetic assemblies, they be magnetized after assembly.

Rare Earth Machining

Since rare earth magnet material is prone to chipping and cracking, it does not lend itself to conventional machining methods. It can, however, be abrasively ground, but only with the use of liberal amounts of coolant. The coolant minimizes heat fracturing and the risk of fires caused by oxidized grinding dust.

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