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The rare magnets Armstrong Magnetics supply are
Neodymium Iron Boron and Samarium Cobalt.
These rare earth magnets are manufactured in
metallurgical process. Powder of rare earth elements and some transition
metal are melt, alloyed, crushed, milled, pressed and meanwhile magnetically
orientated. After pressed, the rare earth magnets are sintered, heat treated and
ground to final dimensions. Rare earth
magnets are extremely powerful per volume, thus miniaturization could be
achieved by using rare earth magnets in industrial or consumer applications.
Rare earth magnets have extraordinarily high Hci
Intrinsic coercive force, they are good to be used as magnetic repelling
component in motors, and similar applications.
Unfortunately, Neodymium magnet has high Reversible temperature
coefficient(-.009 to-.13% per
ºC
and low Tmax
Maximum service temperature(150ºC
for N35 grade for example), so it can not
work stably at high temperature. Another imperfection, Neodymium is that it is
prone to oxidized corrosion and needs to be protected by coating for long term
use. Whereas, Samarium has premium behavior in above said environments. It
performs well up to 500ºC
and it has no rusting problem.
Rare earth magnets are brittle and can be abrasively machined with coolant
served to absorb heating and dust. Without coolant, rare earth magnets
could crack and chip by the heat produced during high speed cutting or
grinding, and the sparks contain the easily oxidized grinding dust that
could cause fire! Armstrong Magnetics
stock rare earth magnets in popular shapes and sizes for immediate delivery
and custom make rare earth magnets as per customers' needs.
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