We are one of the highly established manufacturers and suppliers of superb quality Rare Earth Magnets and offer it at admirable prices. These Rare Earth Circular Magnets are designed and manufactured by well-trained and highly skilled engineers who have proficiency and expertise in the field of manufacturing Rare Earth Magnets. Application of high quality raw material in Rare Earth Circular Magnets manufacturing increase reliability and performance of products.
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 sintered, aged, ground to dimension, magnetizem and tested. They are called "Rare Earth" Magnets because the elements of neodymulum and samarlum are classified in the lanthanides section of the Periodic Table of the Elements.
Neodymium magnets (Nd-Fe-B) are composed using Neodymium, Iron, Boron and few transition metals. Samarium Cobalt magnets (SmCo) are composed from samarium, cobalt and iron. These Earth Magnets are extremely strong for their shapes as rings, blocks and discs.

Neodymium
Attributes of Neodymium

Very high resistance to demagnetization

High energy for size

Good in ambient temperature

High priced

Material is corrosive and should be coated for long term maximum energy out put

Low working temperature for heat applications

Application of Neodymium

Neodymium is applied in Magnetic Separator, Linear Actuators, Microphone Assemblies, Servo Motors, DC motors (automotive starters), computer rigid disc drives, hammer bank printers, and speakers.

Samarium
Attributes of Samarium

High resistance to demagnetization

High energy (magnetic strength is strong for its size)

Good temperature stability

Expensive material (cobalt is market price sensitive)

Applications of Samarium

Computer disc drives

Sensors

Traveling wave tubes

Linear actuators

Satellite systems

Motors where temporary stability is vital

Rare Earth Tolerances

For as pressed material, tolerance on the thickness (direction of magnetization) is +/-.127mm. Other Dimensions are +/-2.5% or +/-.254mm, which 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 less than 10% of the surface is missing. Cracks are acceptable as long as they do not extend across more then 50% of pole surface.

Rare Earth Magnetizing and Handling

Rare Earth Magnets are very brittle and magnetically strong. Therefore, it is crucial to handle these magnets with extreme care to avoid personal injury and damage to the magnets. Fingers can be severely pinched between attracting magnets. Magnets 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.



Note: Technical data and specification subject to change. # Special Rare Earth Magnets can be made on request of customers, they have to just send us their technical data and application, required for our engineers.